Planter edging system

Abstract

A support arrangement for a planter edging system. The planter edging system comprises a set of edging panels 18 arranged for end-to-end engagement to form at least part of a boundary of a planting ar

Description

Field of the Invention The invention relates to the field of edging systems for large-scale commercial planters. Background An increasing desire to incorporate green spaces into urban environments has driven the development of commercial planters, in which a substantial volume of soil or other growing medium is contained by a rigid boundary wall to create a large-scale planting area. The scale of commercial planters entails that their boundary walls effectively act as retaining walls that must withstand the load of the material within, which may be many tonnes. Commercial planters should also be robust in view of their public position, and may even be vulnerable to vehicle impacts in some applications. Commercial planters are therefore entirely distinct from consumer garden border systems for lawns, raised beds and the like, which are substantially free from such load considerations. By way of example, a consumer garden border may be of the order of 200mm in height, and typically no more than 250mm, whereas commercial planters are typically 600-700 mm in height and heights of 1.2m or more are known. Whilst in principle a commercial planter could be created using a wall of brick or similar, constructing a planter in this way is labour intensive and may not offer the desired aesthetic. To address this, some commercial planters instead have boundary walls formed from a series of steel edging panels coupled end-to-end to form a closed loop that encloses a planting area. Such edging systems can be erected in a fraction of the time taken to construct a brick wall and can provide a substantially smooth, continuous outer wall for a clean, modern aesthetic. As edging panels are generally formed from sheet metal, bracing elements, or ‘structural gussets’, are typically used to provide the required strength in the boundary wall. The gussets transfer loads from the wall to a foundation and thereby stiffen the wall and increase its capacity to resist bending under the weight of the material contained in the planting area. Such gussets may, for example, be welded to an inner surface of the boundary wall to extend perpendicularly inwardly from that inner surface to attach to a foundation, for example via bolts or other mechanical means. The gusset usually extends substantially to the top of the boundary wall to ensure that no weak areas arise that could deform in service. The Applicant’s earlier UK patent application no. GB 2600394 discloses an edging system that is self-supporting and that has a locking arrangement that dispenses with the need for bolts or the like. Assembly of an edging system may be complicated if the surface on which the system is to be installed is not level. For example, commercial planters may be installed on roofs, which commonly have one or more gradients, or ‘falls’, to promote drainage. This may create a need to adapt the edging system to the gradient of the roof in situ during assembly, for example by cutting or reshaping the gussets, which may represent significant additional work when installing the system. It is against this background that the present invention has been devised. Summary of the Invention Against this background, the invention provides a support arrangement for a planter edging system. The planter edging system comprises a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area. The support arrangement comprises: a base; and a panel support configured to act between the base and at least one respective edging panel to hold the edging panel upright, in use, the panel support comprising a coupling interface for coupling or connecting to the edging panel. The support arrangement is configured to enable a position of the base to be adjusted relative to the coupling interface. Adjusting the position of the base relative to the coupling interface entails adjusting the position of the base relative to the edging panel, when connected to the coupling interface. The support arrangement is therefore configured to enable a position of the base to be adjusted relative to the edging panel. Adjusting the position of the base may include any of: adjusting an angle or orientation of the base; adjusting a vertical position of the base; and adjusting a horizontal position of the base. Correspondingly, adjusting a position of the base may involve rotating the base or moving the base by translation, for example, relative to the coupling interface. By configuring the support arrangement to enable the base to move relative to the coupling interface and therefore adjust the position of the base, the base can be adapted to the gradient of a surface on which the system is installed, so that the base can lie flat on the surface while the edging panel(s) remain substantially vertical. This, in turn, may ease installation of the system and / or improve the quality of the installation. The coupling interface of the panel support may take a variety of forms, and may comprise a surface that engages the respective edging panel, in use, for example. Such a surface may be fixed to the edging panel, for example by welding or using mechanical fixings. Alternatively, or in addition, the coupling interface may comprise at least one formation such as a flange that engages the respective edging panel, in use. For example, a flange of a coupling interface may be received in a corresponding slot of an edging panel. Such a flange may include a surface that engages the edging panel. The support arrangement may be configured to enable the base to rotate relative to the coupling interface to adjust the position of the base, namely the angle or orientation of the base. The support arrangement may be configured to enable the base to rotate about an axis that extends substantially parallel to the respective edging panel, in use. The support arrangement may be configured to enable the base to rotate about an axis that extends substantially orthogonally to the respective edging panel, in use. The support arrangement may be configured to enable rotation of the base about multiple axes relative to the coupling interface, which axes may be mutually orthogonal. In some embodiments, the panel support comprises an assembly that is adjustable to vary the position of the base relative to the coupling interface. The assembly may be adjustable to vary a height and / or a width of the panel support. The assembly may be adjustable to vary an orientation of the base. Alternatively, it is also possible for the panel support to be defined by a support member, which may, for example, be coupled to the base in a manner that enables the position of the base to be adjusted, for example using a rotatable coupling. In some embodiments, the panel support comprises a first support member that comprises the coupling interface, and a second support member for connecting to the base, the first support member being movable relative to the second support member. The second support member may be rotatable about a first axis relative to the first support member. The first axis may be generally horizontal when in use in the edging system. The first axis may be orthogonal to a plane in which the second support member generally extends. The plane in which the second support member extends may correspond to a plane of a major surface of the second support member, for example. The first axis may be generally parallel to the edging panel, when in use. The second support member may support rotation of the base about a second axis. The second axis may be generally horizontal when in use in the edging system. The second axis may be parallel to a plane in which the second support member extends. The second axis may be generally orthogonal to the edging panel when in use. The first axis may be orthogonal to the second axis. The first support member may be movable by translation relative to the second support member. For example, the first support member may be movable by translation along an axis that is parallel to a plane in which the first support member extends. The plane in which the first support member extends may correspond to a plane of a major surface of the first support member, for example. The first support member may be movable by translation along an axis that is generally vertical when in use in the edging system. In such embodiments, the support arrangement may have an adjustable height. The panel support may comprise an interface module, or adjustment module, connected between the first and second support members. The interface module may be operable to vary a spacing between the first and second support members, for example to translate the first support member relative to the second support member. The interface module may comprise a mechanism for effecting relative movement between the first and second support members. The mechanism may comprise a threaded interface. The interface module may comprise multiple mechanisms for effecting respective modes of relative movement between the first and second support members. The support arrangement may comprise a rotatable coupling between the second support member and the interface module. The interface module may comprise a first adjustment member associated with, and optionally connected to, the first support member. The interface module may comprise a second adjustment member associated with, and optionally connected to, the second support member. Alternatively, the first support member may be directly coupled to the second support member, in which case the support arrangement may comprise a rotatable coupling between the first and second support members. The second support member may comprise formations configured to form a rotatable coupling with corresponding formations on the base. The formations may include hook formations or a hinge arrangement, for example. The formations of the second support member and the base may form a male-female interface, for example. The support arrangement may comprise locking openings configured to receive a locking element, for example a locking pin, to set a relative angle between the first and second support members. The support arrangement may comprise openings configured to indicate a relative angle between the first and second support members. The panel support may be configured to join adjacent edging panels together. The coupling interface may cooperate with a locking member to join panels together, for example. The panel support may connect to and support multiple edging panels. The panel support may be configured to act as a gusset, and may define an adjustable gusset. By acting as a gusset, the panel support may provide the strength required by commercial planter systems. The base may be arranged to lie on a surface on which the edging system is installed, in use. The base may comprise a base plate. The base may have a raised portion, which may be elevated above a surface on which the base rests in use, for example for accommodating a coupling between the base and the panel support. The support arrangement may be configured to enable a position of the base to be adjusted to align with a surface on which the edging system is installed, in use. The invention also extends to a planter edging system comprising at least one support arrangement of the above aspect. Another aspect of the invention provides a planter edging system, comprising a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area, and at least one support arrangement. The support arrangement comprises: a base; and a panel support connected to at least one of the edging panels and configured to act between the base and the edging panel to hold the edging panel upright, in use. The support arrangement is configured to enable a position of the base to be adjusted relative to the or each edging panel connected to the panel support. The support arrangement may be a support arrangement of the above aspect. The panel support may extend generally perpendicularly to the or each edging panel to which the panel support is connected. The planter edging system may comprise a set of support arrangements, each support arrangement acting to support one or more of the edging panels. The panel support may comprise a coupling interface for coupling to the edging panel. The base may anchor the panel support, in use. The base may be arranged to be loaded by contents of the planting area, in use. The base may optionally be configured to enable the edging system to be assembled without the base being mechanically secured to the surface on which it rests, which may avoid having to provide a separate foundation. The base may alternatively be secured mechanically and / or may connect to a foundation. Each edging panel may comprise a planter wall having an inner surface exposed to contents of the planting area, in use. The inner surface of the planter wall of at least one of the edging panels may be substantially planar. Alternatively, or in addition, the panels may have curved planter walls. Each edging panel may comprise a respective end flange extending along each side edge of the inner surface of the planter wall, each end flange defining an outwardly-directed mating face arranged to engage a corresponding mating face of an adjacent edging panel. The planter edging system may comprise a set of panel connector assemblies, each panel connector assembly being configured to lock a respective pair of engaged end flanges of adjacent edging panels together. A panel connector assembly may comprise a locking member configured to engage a coupling interface of a support assembly, for example. The edging panels and / or the base are optionally formed from sheet metal. The panel support may be at least partly formed from sheet metal. Forming these components from sheet metal may advantageously entail that they are straightforward and inexpensive to manufacture. Respective outer surfaces of the planter walls of engaged edging panels may be substantially continuous with each other, in use. Another aspect of the invention provides a method of constructing a planter edging system. The system comprises a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area. The method comprises: connecting a panel support of a support arrangement to one or more of the edging panels; and adjusting the support arrangement to alter the position of a base of the support arrangement relative to the or each edging panel. The method may comprise aligning the base with a surface on which the system is installed. It will be appreciated that preferred and / or optional features of each aspect of the invention may be incorporated alone or in appropriate combination in the other aspects of the invention also. Brief Description of the Drawings In order that it may be more easily understood, an embodiment of the invention will now be described, by way of example only, with reference to the following drawings, in which like features are assigned like numerals, and in which: Figure 1 shows a cut-through of an assembled planter edging system; Figures 2a and 2b show, respectively, front and rear perspective views of an edging panel of the system of Figure 1; Figure 3 shows a flat pattern or ‘blank’ of the edging panel of Figures 2a and 2b; Figures 4a and 4b show, respectively, front and rear perspective views of a support assembly of the system of Figure 1; Figure 5 shows a perspective view of a base plate of the system of Figure 1; Figure 6 shows a perspective view of a support arrangement of the system of Figure 1, including the support assembly of Figures 4a and 4b assembled with the base plate of Figure 5; Figures 7a to 7c show various views of a first stage of assembling the support assembly with the base plate, and Figure 7d shows a front view of a second stage of assembling the support assembly with the base plate; Figure 8 shows a perspective view of a locking member of the system of Figure 1; Figure 9 shows a flat pattern or ‘blank’ of the locking member of Figure 8; Figures 10 to 12 show a sequence of assembling part of the system of Figure 1; Figure 13 is a detail view of a locking arrangement of the system of Figure 1; Figures 14 to 17 show, respectively, perspective, end, front and rear views of the assembled part of the system of Figures 10 to 12; Figures 18 and 19 show the support assembly of the system of Figure 1 in front and rear views respectively, with some components hidden to reveal an adjustment mechanism of the support assembly; Figures 20 and 21 show, respectively, the support assembly in an initial state and an extended state in perspective view; Figure 22 corresponds to Figure 21 but shows front and rear views of the support assembly; Figures 23 and 24 illustrate pivoting of the base plate relative to the support assembly about a first axis; Figures 25 and 26 illustrate pivoting of the base plate relative to the support assembly about a second axis; Figure 27 shows in front perspective view a portion of a planter edging system including an alternative support arrangement; Figures 28 to 30 correspond to Figure 27 and show, respectively, rear perspective, front and end views of the portion of the planter edging system; Figure 31 shows the support arrangement of Figure 27 in isolation; Figure 32 shows a pair of support arrangements as shown in Figure 27 on an inclined surface to illustrate side-to-side tilting of the base plate relative to the support assembly; and Figure 33 shows a pair of support arrangements as shown in Figure 27 on an inclined surface to illustrate front-to-back tilting of the support assembly relative to the base plate. Detailed Description In general terms, embodiments of the invention provide planter edging systems for commercial planters. The edging systems include support arrangements comprising panel supports and associated bases that support a planter wall. The panel supports may act as gussets, by transferring loads from the planter wall to the associated bases. Each support arrangement may be configured such that the position of the base, for example the location and / or the orientation of the base, can be adjusted relative to the planter wall and / or relative to a coupling interface of the panel support that connects to the planter wall. This adjustability may enable the system to be adapted to a gradient of a surface on which it is installed. For example, the panel support may include an adjustable support assembly or otherwise incorporate means to adjust the position of the associated base relative to the planter wall. In some embodiments, the system is based on the Applicant’s earlier system disclosed in GB 2600394, but implements support arrangements that allow for adjustment of the positions of the bases. Accordingly, the system may also be self-supporting and / or configured to be erected quickly and with minimal tools. Some embodiments offer bolt-less assembly by providing connector assemblies that can create robust joints between neighbouring panels using interlocking formations that are pressed into engagement and are self-retaining thereafter. Some embodiments also dispense with the need for separate foundations by incorporating base arrangements that interact with the contents of the planter to support the walls of the edging system. It is noted that the locking arrangement and self-supporting nature of the system are optional, however. It is also noted that adjustable support arrangements according to the invention may be used in other planter edging systems. The above benefits may be provided whilst preserving the smooth exterior wall and general aesthetics that are desired for planter edging systems. Figure 1 shows part of a commercial planter 10 comprising a boundary wall 12 and a planting area 14 that is enclosed by the boundary wall 12. The boundary wall 12 is defined, at least in part, by a planter edging system 16 according to an embodiment of the invention. The edging system 16 shown in Figure 1 comprises a series of edging panels 18 arranged end-to-end to form three sides of the rectangular boundary wall 12. In the example shown in Figure 1, some of the edging panels are generally flat and straight, while others are curved about generally vertical axes of curvature. It will be appreciated that the boundary wall 12 may be completed by further edging panels that are not shown in Figure 1. Equally, the edging system 16 could be supplemented by another wall to complete the boundary wall 12. For example, the edging system 16 may be installed against a building or another structure, such that an external wall of the building or structure closes the rectangle and thus defines part of the boundary wall 12. Accordingly, planter edging systems of embodiments of the invention may define an entire boundary wall of a commercial planter 10, or part of a boundary wall. It is noted that the shape of the boundary wall 12 shown in Figure 1 is merely an example, and edging systems of the invention can be configured to create boundary walls of various shapes. Figure 1 shows the edging system 16 installed on a generally horizontal surface 20, which in this example may be a roof of a building. More specifically, the edging system 16 is installed on a drainage crate 21 that rests on the roof 20, the drainage crate 21 serving to enable water to drain from soil contained within the planter 10 to drainage points on the roof 20. A series of square tiles or slabs 22 are arranged around the outer periphery of the edging system 16 to create a walkway that hides and protects the underlying roof 20. It is evident from Figure 1 that no additional foundation or supporting structure is provided, and the system 16 rests directly on the drainage crate 21. In this respect, in the Figure 1 embodiment foundational support to the boundary wall 12 is provided through interaction between components of the edging system 16 and the contents of the planting area 14. A separate foundation may be provided in other embodiments, however. A panel support in the form of a support assembly 24 is provided at each interface between adjacent edging panels 18, each support assembly 24 acting as a gusset to hold those panels 18 upright against the load of the planter contents, in use. Each support assembly 24 extends into the planting area 14 and couples to a respective base in the form of a generally horizontal base plate 28, which lies on the drainage crate 21. Each support assembly 24 therefore acts as a coupling between the associated edging panels 18 and the respective base plate 28. The support assembly 24 and the base plate 28 cooperate to hold the panels 18 upright, and so collectively define a support arrangement 25 for supporting the panels 18 against the load of the planter contents. The support arrangement 25 comprising the combination of the support assembly 24 and the base plate 28 is configured such that the base plate 28 can move relative to the boundary wall 12 to align the base plate 28 with the surface of the drainage crate 21, as shall become clear from the description that follows. The edging panels 18 and support arrangements 25 are arranged in a repeating pattern, such that each panel 18 and its associated support arrangement 25 collectively define a boundary wall section. The support assemblies 24 also act to secure neighbouring panels 18 to one another in this example, although in other examples the panels may be secured together in a different way, for example using a separate locking arrangement, while the support assemblies act only to support the panels. In overview, and as seen more clearly in Figures 4a and 4b, each support assembly 24 comprises: an upper support member 26 that connects to the associated edging panels 18, the upper support member 26 extending in a generally vertical plane that is orthogonal to the associated edging panels 18; a lower support member 27 that connects to the associated base plate 28, the lower support member 27 extending generally parallel to the upper support member 26; and an adjustment module 29 connecting, and enabling adjustment of the relative positions of, the upper and lower support members 26, 27. A locking member 30 secures the support assembly 24, and specifically the upper support member 26, to the edging panels 18. Each of these components is described in more detail below. In overview, each upper support member 26 secures to an interface between adjacent edging panels 18 to couple those panels 18 together. The support assembly 24 also acts to transfer loads from the panels 18 to the base plate 28, through the upper support member 26, the adjustment module 29 and the lower support member 27. The base plate 28, in turn, is sized and positioned such that the weight of soil or other material within the planter 10 bearing down on the base plate 28 is sufficient to provide the necessary stabilising force to hold the associated edging panels 18 in position in this example. In this way, the edging system 16 is self-supporting and dispenses with the need for a separate foundation or for fastening to the surface 21 upon which the system 16 is installed, thereby easing installation. However, in other embodiments the edging system may alternatively, or additionally, be arranged to be secured to a foundation or to the surface on which the system is installed. Conveniently, many components of the edging system 16 may be formed from sheet metal that is cut to a flat pattern or ‘blank’ and then folded and surface-treated as necessary to produce the final component, with no further manufacturing operations being required. The edging system 16 is therefore relatively inexpensive to manufacture. In this embodiment, the components are formed from mild steel sheet of 3mm thickness. This may be treated, for example galvanised or painted, as required for protection from the elements. Figures 2a and 2b show an individual edging panel 18 in front and rear views respectively. The edging panel 18 comprises a generally planar, oblong planter wall 32 whose longer edges extend longitudinally when assembled with other edging panels 18, such that the longitudinal edges correspond to a top and a bottom of the panel 18. The longitudinal edges are connected by side edges corresponding to ends of the panel 18. References below to features that extend ‘vertically’ or ‘horizontally’ refer to the orientation of the edging panel 18 when installed, ‘horizontal’ therefore corresponding to ‘longitudinal’. Each longitudinal edge of the planter wall 32 has a respective longitudinal flange 34 extending along the entirety of the edge. The longitudinal flanges 34 extend from an inner surface of the planter wall 32, the longitudinal flanges 34 being substantially orthogonal to the inner surface and thus parallel to each other. Correspondingly, each side edge has a respective end flange 36 extending along most of the edge, each end flange 36 extending orthogonally to and inwardly from the inner surface of the planter wall 32 and thus orthogonally to the longitudinal flanges 34. The four flanges 34, 36 of the edging panel 18 are of equal length, namely a dimension orthogonal to the fold of the flange, such that the panel 18 has the general form of a shallow cuboidal tray. The flanges 34, 36 therefore form a skirt extending around the flat front face of the edging panel 18. The major surfaces of each end flange 36 define an inner surface 38, which is directed inwardly and towards the corresponding surface of the opposed end flange 36 of the panel, and an outwardly-directed engagement or mating face 40, which is configured to engage a corresponding mating face 40 of another edging panel. Each end flange 36 comprises a series of three identical vertically-extending end flange slots 42 that are regularly-spaced along a vertical centreline of the end flange 36. A triangular opening 44 is disposed beside the uppermost end flange slot 42, on the opposite side of the end flange slot 42 to the fold of the flange. The end flange 36 also includes a circular opening 46, positioned in a space between adjacent end flange slots 42, below the triangular opening 44. The end flange slots 42 enable engaged mating faces 40 to be secured to one another using an upper support member 26 and a locking member 30, while the triangular opening 44 and circular opening 46 act as alignment apertures that are used to confirm locking engagement of the locking member 30 with the upper support member 26, as described in more detail later. The end flanges 36 terminate short of the ends of their respective side edges and are folded such that they are offset towards the centre of the edging panel 18 to occupy space between the longitudinal flanges 34, which therefore overhang the end flanges 36. Each mating face 40 extends in a common vertical plane with a respective end of each longitudinal flange 34. The end flanges 36 are therefore recessed to lie entirely within an envelope defined by the longitudinal flanges 34 in this embodiment. Accordingly, when the end flanges 36 of a pair of adjacent edging panels 18 engage, the respective longitudinal flanges 34 of the panels 18 abut one another directly to form substantially continuous surfaces. This is achieved using the flat pattern 48 for the edging panel 18 shown in Figure 3, which represents the shape to which a section of sheet metal is cut, for example by laser cutting, before folding the flanges to create the final shape of the edging panel. This shape takes the general form of a main oblong 50 having a smaller rectangular tab 52 on each of the shorter sides of the main oblong 50, each of which tabs 52 will become an end flange 36. The slots and openings of the end flanges 36 are therefore cut into the tabs 52. Aside from the triangular and circular openings 44, 46 and a chamfer at the upper end of each tab 52, the flat pattern 48 has symmetry about both horizontal and vertical axes. Portions of the main oblong 50 extending above and below the tabs 52 in Figure 3 will define the longitudinal flanges 34. In this respect, dashed lines in Figure 3 represent fold lines along which the flanges are formed and which therefore define the edges of the planter wall 32. Figure 3 reveals recesses 54 that are cut into the side edges at each end of each end flange 36. These recesses 54 act as reliefs that enable the fold lines for the end flanges 36 to be moved towards the centre of the panel 18 and inboard of the extremities of the portions of the main oblong 50 that will become the longitudinal flanges 34. This in turn allows the end flanges 36 to fold into a space between the longitudinal flanges 34, such that the mating faces 40 of each end flange 36 align with corresponding ends of the longitudinal flanges 34. When the panel 18 is assembled with other edging panels 18 such that its planter wall 32 defines a portion of the boundary wall 12, the inner surface of each planter wall 32 faces into the planting area 14 and thus engages the soil or other material contained in the planter 10. Meanwhile, an outer surface of the planter wall 32 on an opposite side to the inner surface defines an exterior of the respective boundary wall section, in use. The outer surface is generally smooth and featureless and, by virtue of the recessed end flanges 36, the edging panel 18 is arranged to engage neighbouring panels 18 such that the outer surfaces of the respective planter walls 32 connect to form a substantially smooth and continuous surface that extends around the boundary wall 12. Returning to Figures 4a and 4b, the support assembly 24 is shown in isolation in front and rear views. The upper support member 26 has a generally triangular main section 56 having a series of three locking tabs or flanges 58 that extend orthogonally from a vertical edge 60 of the main section 56 in a common vertical plane. The uppermost locking flange 58 coincides with the top of the vertical edge 60. The main section 56 is truncated at this corner to create a short additional horizontal edge, which increases the rigidity of the uppermost locking flange 58. The lowermost locking flange 58 is positioned at the lower end of the vertical edge 60, while the third locking flange 58 is positioned midway between the uppermost and lowermost locking flanges 58. Each locking flange 58 includes a vertical engagement slot 62. An upper portion of each engagement slot 62 is generally rectangular, and below this portion the sides of the slot converge downwardly to a point. The locking flanges 58 are sized and positioned in a complementary manner to the end flange slots 42 of an edging panel end flange 36, such that all three locking flanges 58 can be inserted simultaneously into respective end flange slots 42 of an end flange 36. The locking flanges 58 are sized for a close sliding fit in the end flange slots 42 to minimise play of the flanges 58 in the slots 42. The locking flanges 58 therefore define a coupling interface of the support assembly 24, through which interface the support assembly 24 couples to the edging panels 18. Adjacent to the fold of the uppermost locking flange 58, the main section 56 of the upper support member 26 includes a triangular opening 64 that is identical to those of the end flanges 36 of the edging panels 18, and moreover is arranged to align with the corresponding apertures of engaged end flanges 36 when securing two panels 18 together, as shall become clear later. The lower support member 27 is defined by a generally oblong plate having a series of hook formations 66 arranged along its lower edge. The hook formations 66 are arranged in two groups of three, the formations 66 being regularly spaced within each group and the groups being mutually spaced to locate at opposite ends of the lower edge of the lower support member 27. Each hook formation 66 is formed from a tab extending from the lower edge of the lower support member 27 that is bent through 180°, to create a bend that curves around an axis that is parallel to the lower edge of the lower support member 27. In this example, the bends of the hook formations 66 share a common axis of curvature and are substantially identical to one another. Each hook formation 66 has parallel straight portions on each side of its bend, the straight portions being connected by a curved portion defined by the bend. As shall become clear, the hook formations 66 are configured to be received onto corresponding bar formations in the base plate 28, to form a pivotable coupling between the base plate 28 and the lower support member 27. The adjustment module 29 is interposed between, and connects, the upper and lower support members 26, 27. The adjustment module 29 therefore provides an interface between the upper and lower support members 26, 27, and so may be regarded as an interface module. The lower support member 27 is coupled to the adjustment module 29 by a rivet 68, which allows the lower support member 27 to pivot relative to the upper support member 26 about a first axis 70 defined by the rivet 68, the first axis 70 being generally horizontal and parallel to the associated portion of the planter wall 32. The lower support member 27 also includes a set of locking holes 72 that cooperate with corresponding holes in the adjustment module 29 to enable the relative orientation between the upper and lower support members 26, 27 to be set using a locking pin, as described in more detail later. More specifically, the lower support member 27 includes two horizontal rows of six locking holes 72, plus a further locking hole 72 disposed at a level between the two rows, and positioned to the right of the rows in Figure 4a, this further locking hole 72 defining a neutral position corresponding to an angle of 90° between the upper and lower support members 26, 27. The adjustment module 29 is also configured to enable the upper support member 26 to translate relative to the lower support member 27, to adjust the vertical spacing between the upper and lower support members 26, 27, and therefore the overall height of the support assembly 24. The configuration of the adjustment module 29 is described in more detail later. In general terms, the height of the support assembly 24 is typically configured to be sufficient to support the uppermost parts of the edging panel 18 against bending in use. The dimensions of the support assembly 24 may vary, however, and in practice the support assembly 24 may be sized according to the requirements of each application, for example to provide sufficient structural support to the edging plates to which it is coupled, to provide sufficient bracing and to transfer loads from the edging panels 18 to the base plate 28 effectively. Figure 5 shows the base plate 28 in isolation, which illustrates that the base plate 28 is generally rectangular and close to being square, but with rounded corners for safety. As noted above, in this example the base plate 28 serves to anchor the support assembly 24 and the associated edging panels 18 in the soil or other substrate contained in the planter 10, and to this end is sized to provide a sufficient anchoring force to hold the associated edging panels 18 upright by virtue of the weight of soil acting on the base plate 28. In general terms, noting also that each base plate 28 contributes support to multiple edging panels 18, this may entail configuring the base plates 28 of the edging system 16 to have a combined surface area that is sufficient that a load imparted to the base plates by the weight of the contents of the planter 10 is sufficient to balance the horizontal loads imparted to the planter walls 32. Typically, the combined surface area of the base plates 28 will be relatively evenly distributed across the individual panels, and in the simplest implementations the base plates 28 are identical to one another. The base plate surface area needed may be reduced if part of the boundary wall 12 is defined by a wall of a building to which the edging system 16 is attached, to the extent that the building imparts rigidity to the edging system 16. It is also possible for the base plates 28 to be secured mechanically to the underlying surface 21 in other embodiments. The base plate 28 includes a central raised portion 74 that extends across the base plate 28, from one side of the base plate 28 to the opposite side, between a pair of side portions 76 that rest on and engage the surface of the drainage crate 21 when installed. The raised portion 74 is separated from each side portion 76 by a short, inclined wall 78 defined by a pair of folds in the sheet material from which the base plate 28 is formed, the folds being at approximately 45° in opposite directions. The length and angle of the inclined wall 78 is such that the raised portion 74 is spaced above the side portions 76 to an extent that allows the hook formations 66 of the lower support member 27 to move freely during assembly, while the side portions 76 of the base plate 28 rest on the surface of the drainage crate 21, as shall become clear. Six similar pairs of apertures are arranged in a series that extends centrally along the raised portion 74 of the base plate 28. Each pair of apertures includes a large, generally square aperture 80 and a smaller, oblong aperture 82. The length of the oblong aperture 82 corresponds to the width of the square aperture 80, and each pair is arranged with the respective side edges of the apertures 80, 82 in alignment. Each pair of apertures 80, 82 is separated by a thin, straight section of material defining a bar formation 84, such that the base plate 28 includes a series of six bar formations 84 extending in linear series. The bar formations 84 are positioned so that each receives a respective hook formation 66 of the lower support member 27, the apertures 80, 82 to each side of the bar formation 84 accommodating the hook formation 66 as it hooks onto the bar formation 84. The hook formations 66 may therefore be regarded as male formations that are received by complementary female formations. The bar formations 84 and the hook formations 66, once engaged, form a pivotable coupling that allows the base plate 28 to rotate about a second axis 86 that, as Figure 4a shows, extends generally horizontally and substantially orthogonally to the associated portion of the planter wall 32. The second axis 86 is substantially orthogonal to the first axis 70. Accordingly, the support assembly 24 is configured to accommodate three degrees of movement of the base plate 28 relative to the edging panels 18, namely rotation about either of the first and second axes 70, 86, and translation along a vertical axis. This adjustability provided by the support assembly 24 is described in more detail later. Figure 5 also shows a large opening positioned near to an end of the raised portion 74 of the base plate 28, this opening serving as a handle 88 for holding and manipulating the base plate 28. The height of the raised portion 74 also eases access to the handle 88 when the base plate 28 lies on a surface. A small circular opening 90 adjacent to the handle 88 provides for attachment of structural wire that may be added to extend between opposed base plates 28 of the edging system 16, to resist lateral movement of the planter walls 32 and therefore aid in holding the shape of the boundary wall 12. It is noted that such structural wire is optional and does not typically contribute significantly to holding the edging panels 18 upright. A slot 92 is formed into one of the inclined walls 78, the slot 92 also extending a short way into both the raised portion 74 and the associated side portion 76 of the base plate 28. The slot 92 serves to accommodate the protruding rivet 68 that secures the lower support member 27 to the adjustment module 29 during assembly, as shall become clear. In this respect, Figure 6 shows the support arrangement 25, comprising the support assembly 24 assembled with the base plate 28, with the hook formations 66 of the support assembly 24 engaged with the bar formations 84 of the base plate 28. To reach this arrangement, as Figures 7a to 7c show, the support assembly 24 is initially laid flat on the base plate 28, so that the tips of the hook formations 66 can be inserted through the square apertures 80 of the base plate 28, and then the hook formations 66 pulled into engagement with their respective bar formations 84. While in this position, the rivet 68 is accommodated in the slot 92 of the base plate 28 as shown in Figure 7b. Once the hook formations 66 and bar formations 84 are engaged, the support assembly 24 is rotated around the second axis 86 into an upright position, as shown in Figure 7d, at which point the hook formations 66 wrap around their respective bar formations 84 and the tips of the hook formations 66 protrude upwardly through the oblong apertures 82. In use, the weight of soil loaded onto the base plate 28 holds the base plate 28 against the surface of the drainage crate 21, and so in a generally horizontal orientation. Meanwhile, the support assembly 24 is held in a generally vertical orientation due to its being attached to edging panels 18. Accordingly, while the support assembly 24 and base plate 28 are held in these orientations, the hook formations 66 prevent disengagement of the support assembly 24 from the base plate 28 and thus anchor the support assembly 24 and any edging panels 18 to which it is attached. Meanwhile, the apertures 80, 82 of the base plate 28 that accommodate the hook formations 66 are also sized to limit movement of the hook formations 66, and in turn the support assembly 24, in a horizontal plane and thus enhances the rigidity of the assembly. Figure 8 shows the locking member 30 that is used in this example to secure the upper support member 26 of the support assembly 24 to a pair of engaged end flanges 36 of adjacent edging panels 18. Figure 9 shows the corresponding flat pattern 96 for the locking member 30. It is reiterated, however, that other locking arrangements may be used in alternative embodiments. The locking member 30 is defined by an elongate oblong locking plate 98 having a flange 100 extending along one of its long sides, such that the locking member 30 is L-shaped in transverse section. The flange 100 is provided to ease handling of the locking member 30 when assembling the edging system 16, and so defines a handle. A series of engagement apertures 102 is disposed adjacent to the opposite longer side of the locking plate 98 to the handle 100, the series extending along an axis parallel to the longer side edge, which is vertical in use. Each engagement aperture 102 is generally oblong, having vertical long sides and horizontal short sides. A respective one of the long sides closest to the handle 100 defines an inner edge 104 of the engagement aperture 102, while the other of the long sides correspondingly defines an outer edge 106 of the engagement aperture 102. Each engagement aperture 102 includes an engagement arm or‘tooth’ 108 projecting inwardly from a central part of the inner edge 104 of the aperture 102, the engagement arm 108 extending first horizontally and then downwardly such that the arm 108 is L-shaped in plan view, defining a main portion 110 of the arm 108 from which depends a downwardly-extending finger 112. The finger 112 is aligned with the end of the main portion 110 and extends substantially centrally between the inner and outer edges 104, 106 of the engagement aperture 102. Accordingly, gaps are defined on each side of the finger 112, those gaps being no smaller than the thickness of the locking flanges 58 of the upper support member 26. The overall vertical height of the engagement arm 108, namely the combined height of the main portion 110 and the finger 112, is smaller than the vertical height of the upper rectangular portions of the engagement slots 62 of the locking flanges 58, such that the engagement arms 108 can be inserted through the upper portions of the engagement slots 62. A further projection extends downwardly from the short top edge of each engagement aperture 102, this projection being generally square in plan view and defining a guide formation 114 that is configured to guide an upper end of a locking flange 58, in use. Accordingly, a vertical edge of the guide formation 114 closest to the inner edge 104 of the engagement aperture 102 is aligned with a corresponding edge of the finger 112 of the engagement arm 108, such that a locking flange 58 can be received between the guide formation 114 and the inner edge 104 of the aperture 102. The engagement apertures 102 are arranged in a formation corresponding to that of the locking flanges 58 of the upper support member 26, such that the locking member 30 can be received onto the locking flanges 58 by insertion of each locking flange 58 through a respective engagement aperture 102 simultaneously. A circular opening 116 is provided near the uppermost engagement aperture 102 in Figure 8, the circular opening 116 corresponding in both size and position to the circular opening 46 of the end flanges 36 of the edging panels 18 that act as alignment apertures. Accordingly, when the locking member 30 is secured in the correct position, the circular opening 116 aligns with those of the end flanges 36 of the associated edging panels 18 to confirm the correct position for the locking member 30. Correspondingly, between the uppermost engagement aperture 102 and the handle 100 is a triangular opening 118 corresponding in size, shape and position to the respective triangular openings 44, 64 of the upper support member 26 and the end flanges 36 so that, when the locking member 30 is secured in the correct position, the respective triangular openings 44, 64, 118 align to confirm the correct position for the locking member 30. It is noted that the shape of the triangular openings 44, 64,118 allows the orientation to be verified. The assembly of a pair of edging panels 18 using a support assembly 24, a base plate 28 and a locking member 30 to form a sub-assembly of the edging system 16 shall now be described with reference to Figures 10 to 17. Figure 10 shows an initial step of the assembly, in which the mating faces 40 of respective end flanges 36 of the edging panels 18 are brought into engagement such that their respective end flange slots 42 are aligned. It is noted that the respective triangular openings 44 and circular openings 46 of the end flanges 36 will also be aligned if the slots 42 are correctly aligned. It is clear from Figure 10 that the respective upper longitudinal flanges 34 of the edging panels 18 abut one another directly and extend in a common plane, to produce a substantially continuous surface with a seamless interface from one panel 18 to the next. Then, as Figure 11 shows, the locking flanges 58 of the upper support member 26 are inserted through each pair of aligned end flange slots 42 simultaneously. Figure 11 shows the support assembly 24 and base plate 28 as assembled in advance, which is typically the most practical approach, although in principle the base plate 28 could be fitted to the support assembly 24 after coupling the upper support member 26 to the edging panels 18. Moving on to Figure 12, once the locking flanges 58 are fully inserted through the end flange slots 42, the locking member 30 is positioned on the locking flanges 58 by passing each locking flange 58 through a respective one of the engagement apertures 102 of the locking member 30. This is achieved by manipulating the locking member 30 via the handle 100, which is therefore at the rear of the locking member 30 as viewed in Figure 12. More specifically, the locking member 30 is manipulated such that the locking flanges 58 are first inserted into the space between the engagement arms 108 and the outer edges 106 of the respective engagement apertures 102 and then, through further manipulation, the engagement arms 108 of the engagement apertures 102 are inserted into the respective engagement slots 62 of the locking flanges 58. Once fully inserted such that the fingers 112 are entirely pushed through the engagement slots 62, the locking member 30 is then pressed downwardly such that the arms 108 are driven into the lower tapered portions of the engagement slots 62 in which the surfaces converge. The resulting wedging interaction between the arms 108 and the engagement slots 62 as the locking member 30 moves down progressively generates frictional interference and local deformation of the contacting surfaces of the engagement arms 108 and slots that creates a retaining force that fastens the arms 108 in the slots 62. Meanwhile, the upper ends of the locking flanges 58 locate between the guide formations 114 and the inner edges 104 of the respective engagement apertures 102, to support the upper ends of the locking flanges 58 and to hold the flanges in a vertical orientation. It follows from the above that the locking flanges 58, end flange slots 42, engagement apertures 102 and engagement arms 108 are all dimensioned in a complementary manner to produce the above described interaction as they are pressed together. To produce the required clamping force between the engagement arms 108 and the tapering engagement slots 62, a mallet or similar may be used to urge the locking member 30 downwardly. As the upper support member 26 and locking member 30 secure at three positions simultaneously, conveniently each pair of edging panels 18 can be joined in a single operation. This sits in marked contrast with conventional systems requiring multiple bolts at each interface between panels 18. Bolts or other mechanical fixings may be used to secure edging panels together in other examples, however. Figure 13 shows the final stage of the assembly process, and also provides a detail view of the interface between the uppermost locking flange 58 and the corresponding engagement aperture 102 at this stage. This shows that the locking member 30 has been fully pressed down, such that the engagement arms 108 are lodged in the narrowed regions of the engagement slots 62 and are thus fully engaged, while the upper ends of the locking flanges 58 are close to or abut the upper edges of the engagement apertures 102. This final position defines a locked position for the locking member 30, which can be confirmed by checking that the respective alignment apertures of the locking member 30, end flanges 36 and upper support member 26 are aligned. Once confirmed, assembly of the support assembly 24 with the edging panels 18 is complete and the edging panels 18 are joined, the locking member 30 being self-retaining at this stage due to frictional engagement between its engagement arms 108 with the engagement slots 62 of the upper support member locking flanges 58. The support arrangement 25 can then be adjusted to match the position and orientation of the base plate 28 to the surface 21 on which it will rest, as described further below. Subsequent filling of the planting area 14 with soil, for example, will weigh the base plate 28 down and thus anchor the arrangement to create a robust boundary wall 12 for the planter 10. Figures 14 to 17 show the completed sub-assembly in perspective, end, front and rear views respectively. Figures 16 and 17 show that the support assembly 24 holds the edging panels 18 in a slightly elevated position, so that lower ends of the edging panels 18 are spaced above the level of the base plate 28 and therefore above the surface of the drainage crate 21. This spacing allows for rotation and translation of the base plate 28 relative to the edging panels 18. The configuration of the adjustment module 29 to provide height and angle adjustment functionality shall now be considered in more detail with reference to Figures 18 to 26. First, it is noted that the adjustment module 29 includes a cover 120 that contains an adjustment arrangement 122, the cover being visible in Figures 16 and 17, for example, and hidden in Figures 18 to 26 to reveal the adjustment arrangement 122. As best seen in Figure 20, the upper and lower support members 26, 27 are each attached to a respective element of the adjustment arrangement 122. Specifically, the upper support member 26 is secured to an upper adjustment element 124, and the lower support member 27 is secured to a lower adjustment element 126. The upper adjustment element 124 comprises a generally square main plate 128 having upper and lower horizontal flanges 130 extending along opposed sides, so that the element 124 has a U-shaped cross-section. As Figure 18 shows, the main plate 128 extends beyond the horizontal flanges 130 and widens to create an interface portion 132, to which the upper support member 26 is secured by bolts 133. The lower adjustment element 126 is similar in shape and form to the upper adjustment element 124, in that the lower adjustment element 126 is also formed from a plate that is bent to define opposed horizontal flanges flanking a main plate between them, the main plate having a protruding end portion that provides for attachment to the lower support member 27. More specifically, the lower adjustment element 126 has an oblong main plate 134 having horizontal flanges 136 extending along its longer sides, and an end portion extending beyond the horizontal flanges 136, shown most clearly in Figure 19, defining an interface portion 138 to which the lower support member 27 is coupled, by the rivet 68. Accordingly, the lower support member 27 is pivotably coupled to the lower adjustment element 126. The main plate 134 of the lower adjustment element 126 includes a set of locking holes 140 that are configured to cooperate with those of the lower support member 27 to indicate and fix the angle of the lower support member 27 relative to the lower adjustment element 126. Like the lower support member 27, the locking holes 140 of the lower adjustment element 126 are arranged in two horizontal rows of six with a further locking hole at a level between the rows and corresponding to a neutral position. The respective sets of locking holes 72, 140 of the lower support member 27 and the lower adjustment element 126 are configured such that each locking hole 72 of the lower support member 27 is paired with a corresponding locking hole 140 of the lower adjustment element 126, so that there are seven pairs of locking holes 72, 140. Each pair is configured to come into alignment when the lower support member 27 and the lower adjustment element 126 are at a respective relative angle, so that no two pairs are ever aligned at the same time. Accordingly, the relative angle between the lower support member 27 and the lower adjustment element 126 is indicated by the pair of locking holes 72, 140 that are aligned. In this example, the six positions above and below the neutral position correspond to standard roof falls, easing configuration of the support assembly 24 if the roof fall is known. As best seen in Figure 20, with the cover 120 of the adjustment module 29 removed, an upper flange 142 of the lower support member 27 is visible. The upper flange 142 extends orthogonally from an end portion of an upper edge of the lower support member 27, above the lower adjustment element 126 to cover an end region of the upper horizontal flange 136. The upper flange 142 of the lower support member 27 includes a through-hole 144, which is aligned with a similar through-hole 146 provided in the upper horizontal flange 136 of the lower adjustment element 126. The adjustment arrangement 122 includes a first adjustment mechanism 148, which is provided to control relative rotational movement of the lower adjustment element 126 and the lower support member 27, and therefore to control rotation of the lower support member 27 about the first axis 70 to adjust the angle of the base plate 28 relative to the edging panels 18. The adjustment mechanism 148 includes a first threaded bar 150 that extends along a vertical axis through the aligned through-holes 144, 146 of the upper flange 142 of the lower support member 27 and the upper horizontal flange 136 of the lower adjustment element 126. Nuts are welded to each end of the first threaded bar 150, so that the first threaded bar 150 has an upper nut 152 and a lower nut 154. A spacer tube 156 is received on the first threaded bar 150 and acts to space the lower nut 154 from the upper horizontal flange 136 of the lower adjustment element 126. This, in turn, allows for swivelling movement of the lower end of the first threaded bar 150 as the lower support member 27 rotates around the first axis 70. Similarly, the through-hole 146 of the upper horizontal flange 136 of the lower adjustment element 126 may be oversized, elongated or slot-like to allow for side-to-side movement of the first threaded bar 150 as the lower support member 27 rotates. The first threaded bar 150 can rotate freely inside the spacer tube 156. A first rider nut 158 is carried on the first threaded bar 150 and is fixed to the through-hole 144 of the upper flange 142 of the lower support member 27. The first rider nut 158 is held in a fixed orientation by the attachment to the upper flange 142. For example, the through-hole 144 and the portion of the first rider nut 158 received in the through-hole 144 may have hexagonal or other non-circular cross-sections, creating an interface that resists relative rotation of the first rider nut 158 in the through-hole 144. Accordingly, rotation of the first threaded bar 150 causes axial movement of the first rider nut 158 along the first threaded bar 150, with rotation in one sense causing the first rider nut 158 to move upwardly and rotation in the opposite sense causing downward movement. The first rider nut 158 is therefore configured to ride axially along the first threaded bar 150. In turn, the upper flange 142 of the lower support member 27 is carried with the first rider nut 158 as it moves on the first threaded bar 150, causing the lower support member 27 to rotate about the rivet 68 and so vary the angle of the base plate 28 relative to the upper support member 26. Rotation of the first threaded bar 150 may be driven via the upper nut 152 using a suitable power tool, for example. The adjustment of the angle of the base plate 28 using the first adjustment mechanism 148 is illustrated in Figures 23 and 24. Figure 23 shows the angle adjusted to a value exceeding 90°, and Figure 24 shows the base plate 28 moved to an angle below 90°, relative to the upper support member 26. Figures 23 and 24 also show how the alignment of the pairs of locking holes 72, 140 of the lower support member 27 and the lower adjustment element 126 guides operation of the first adjustment mechanism 148, by indicating the relative angle between the lower support member 27 and the lower adjustment element 126 as described above. Once the pair of locking holes 72, 140 corresponding to the required angle are aligned, a locking pin (not shown) may be inserted through those holes 72, 140 to lock the angle of the base plate 28. It is noted that the position of the base plate 28 is also held by the first rider nut 158, which does not move axially unless the first threaded bar 150 is rotated, and so the first rider nut 158 and the locking pin collectively fix the angle of the base plate 28. The locking pin may alternatively be omitted in this example. Returning to Figures 19 and 20, the adjustment arrangement 122 includes a second adjustment mechanism 160, which is provided to control translational movement of the upper support member 26 relative to the lower support member 27, to adjust the position of the upper support member 26 relative to the base plate 28 and therefore the height of the support assembly 24. The second adjustment mechanism 160 includes a second threaded bar 162, which extends along a vertical axis through aligned through-holes 163 in the upper and lower horizontal flanges 130 of the upper adjustment element 124 and the upper horizontal flange 136 of the lower adjustment element 126. Nuts are welded to each end of the second threaded bar 162, so that the second threaded bar 162 has an upper nut 164 and a lower nut 166. A spacer tube 168 is received on the second threaded bar 162, between the horizontal flanges 136 of the lower adjustment element 126. The spacer tube 168 acts to space the lower nut 166 from the upper horizontal flange 136 of the lower adjustment element 126. The second threaded bar 162 can rotate freely inside the spacer tube 168. A second rider nut 170 is carried on the second threaded bar 162 and is fixed to the through-hole 163 of the upper horizontal flange 130 of the upper adjustment element 124. The second rider nut 170 is held in a fixed orientation by the attachment to the upper horizontal flange 130. For example, the through-hole 163 and the portion of the second rider nut 170 received in the through-hole 163 may have hexagonal or other non-circular cross-sections, creating an interface that resists relative rotation of the second rider nut 170 in the through-hole 163. Also, the spacer tube 168 holds the position of the lower nut 166 relative to the upper horizontal flange 136 of the lower adjustment element 126, so that the second threaded bar 162 is restrained against moving axially when it rotates. Accordingly, rotation of the second threaded bar 162 causes axial movement of the second rider nut 170 along the second threaded bar 162, with rotation in one sense causing the second rider nut 170 to move upwardly and rotation in the opposite sense causing downward movement. The second rider nut 170 is therefore configured to ride axially along the second threaded bar 162. In turn, the upper adjustment element 124 and the upper support member 26 are carried with the second rider nut 170 as it moves on the second threaded bar 162, causing the upper adjustment element 124 and the upper support member 26 to translate along an axis corresponding to the axis of the second threaded bar 162. This varies the spacing between the upper and lower adjustment elements 124, 126 and, in turn, the spacing between the upper support member 26 and the base plate 28 and thus the height of the support assembly 24. Rotation of the second threaded bar 162 may be driven via the upper nut 164 using a suitable power tool, for example. Movement of the upper adjustment element 124 is guided by a guide rail 172, which is defined by a bent plate having an L-shaped cross section in this example. The guide rail 172 is fixed to the upper surface of the upper horizontal flange 136 of the lower adjustment element 126, for example by welding, in an upright orientation. The horizontal flanges 130 of the upper adjustment element 124 include aligned openings having a shape corresponding to the crosssection of the guide rail 172, so that the horizontal flanges 130 of the upper adjustment element 124 are received, and are configured to slide on, the guide rail 172. Accordingly, the guide rail 172 prevents the upper adjustment element 124 from rotating as the second threaded bar 162 is driven, and so ensures that rotation of the second threaded bar 162 drives axial movement of the second rider nut 170. Figures 21 and 22 show the result of driving the second threaded bar 162 to move the upper adjustment element 124, and show the support assembly 24 in a fully extended state with the upper adjustment element 124 moved to its highest position. It is noted that the second rider nut 170 acts to hold the position of the upper adjustment element 124 when the second threaded bar 162 is not rotating, and so the upper adjustment element 124 may be set at any vertical position within the range defined by the second threaded bar 162. Moreover, use of the threaded interface between the second threaded bar 162 and the second rider nut 170 enables the position of the upper adjustment element 124 to be adjusted with precision. In practice, typically the support assembly 24 is attached to the edging panels 18 while in a non-extended state as shown in Figures 18 and 20, and then the height of the support assembly 24 is adjusted once it is in position, although this may vary. It should be appreciated that various other arrangements are possible for adjusting the position of the upper adjustment element 124, or more generally for adjusting the position of the upper support member 26 and the height of the support assembly 24. Similarly, various other ways of accommodating rotational movement of the base plate 28 relative to the edging panels 18 are possible. Figures 25 and 26 illustrate the ability of the support assembly 24 to support a third degree of movement of the base plate 28, namely side-to-side tilting around the second axis 86 by virtue of the pivotable coupling created between the hook formations 66 of the lower support member 27 and the bar formations 84 of the base plate 28. As Figure 26 makes clear, relative to a neutral position in which the base plate 28 is aligned to the horizontal, such tilting is possible in both directions to accommodate a range of gradients of the underlying surface. To summarise, the support arrangement 25 of the above edging system 16 is configured to allow the vertical position and the orientation of the base plate 28 to be adjusted with precision, to adapt to the gradient of the underlying surface over a wide range of angles, whilst supporting the edging panels 18 in an upright, substantially vertical orientation. This maintains the shape and continuity of the boundary wall 12 without having to cut or reshape the support assemblies during installation, and so eases installation of the planter 10 on a roof or other surface that is not level. Figures 27 to 33 show various views of a variant of the edging system 216, having a support arrangement 225 with a simplified support assembly 224. Many components of the edging system 216 are the same as for the system of Figure 1, and so only the differences shall be described. In particular, the edging panels 18, base plate 28 and locking member 30 are unchanged in the variant of Figures 27 to 33. The lower support member 27 of the support assembly 224 is also unchanged. This variant dispenses with the adjustment module 29 of the system of Figure 1, and instead the support assembly 224 has a larger upper support member 226 that connects directly to the lower support member 27. The upper support member 226 is generally triangular, and incorporates features of both the upper support member 26 and the lower adjustment element 126 of the system of Figure 1. Accordingly, three locking flanges 58 extend from a vertical edge of the upper support member 226. The locking flanges 58 are similar in size and position to those of the system of Figure 1 and are arranged for insertion through the end flange slots 42 of the end flanges 36 of the edging panels 18, to secure neighbouring panels 18 together using a locking member 30. The lower support member 27 is coupled to the upper support member 226 by a rivet 268 in a similar manner to the coupling of the lower support member to the lower adjustment element in the system of Figure 1. Accordingly, in the variant of Figures 27 to 33 the lower support member 27 is rotatable about a first axis 270 relative to the upper support member 226, to support front-to-back tilting of the base plate 28 to adjust the angle of the base plate 28 relative to the edging panels 18. In this variant, the upper support member 226 includes a set of locking holes 240 similar to those of the lower adjustment element of the system of Figure 1, which can therefore similarly indicate the angle of the base plate 28 when a locking hole 240 of the upper support member 226 aligns with a corresponding locking hole 72 of the lower support member 27. In this variant, there is no mechanism for altering the angle of the base plate 28, which may therefore be adjusted manually. Once the base plate 28 is at the desired angle, a locking pin 280 is inserted through the aligned pair of locking holes 72, as shown in Figure 27, to lock the position of the lower support member 27 relative to the upper support member 226 and therefore set the angle of the base plate 28. A lower horizontal edge of the upper support member 226 includes a set of hook formations 266 that are sized and positioned in the same way as the hook formations of the system of Figure 1. The hook formations 266 are therefore arranged to couple to the bar formations 84 of the base plate 28 in a similar manner, to produce a rotatable coupling that can rotate around a second axis 286. Accordingly, the support assembly 224 of this variant supports side-to-side tilting of the base plate 28 in a similar manner to the system of Figure 1. This is illustrated in Figure 32, which shows a pair of support arrangements 225 of this variant installed on opposite sides of a roof apex 282, with the respective base plates 28 of the support arrangements 225 tilting in opposite directions to match the gradients of the portions of the roof on which they rest. Similarly, and as noted above, the support assembly 224 of this variant also supports front-to-back tilting of the base plate 28 in a similar manner to the system of Figure 1. This is shown in Figure 33, which shows a pair of support arrangements 225 of this variant resting on portions of a roof 284 at different gradients, with the respective base plates 28 of the support arrangements 225 rotated in opposed directions around the rivet 268 so that the base plates 28 tilt in opposite directions to match the gradients of the portions of the roof 284 on which they rest. Meanwhile, the upper support members 226 of each support assembly 224, and their respective coupling interfaces, both remain aligned to the vertical, to support edging panels 18 in a vertical orientation. Accordingly, the support assembly 224 of this variant is configured to enable the base plate 28 to rotate around orthogonal axes and therefore move to any orientation, similarly to the system of Figure 1. The variant lacks the height adjustment capability of the system of Figure 1, but in comparison offers a simplified and therefore lower cost arrangement. It will be appreciated that many alterations may be made to the embodiments of the invention described above and shown in the Figures, even beyond those already discussed in the description, while still falling within the scope of the appended claims. For example, support arrangements may be configured to provide for any combination of movement modes and degrees of freedom. For example, a support assembly defining a panel support may allow for height adjustment only, or height adjustment in combination with pivoting around a single axis. It is also possible for support assemblies to be configured with an adjustable horizontal depth and therefore enable horizontal translation of the base plate relative to the coupling interface and edging panels. A support assembly may also allow an attached base plate to rotate about a vertical axis. A panel support may comprise a single support member instead of a support assembly, the support member being configured to be movably coupled to a base to form a support arrangement. For example, a support arrangement may comprise a support member and a base, each having respective complementary formations allowing rotation of the base relative to the support member around a single axis only. Also, the various modes of movement may be accommodated in different ways to those shown above. For example, the hook formations and bar formations of the above examples could be replaced by hinges or alternative formations providing a rotatable coupling. In another option, hooks or other male formations could be provided on the base plates with complementary formations for receiving the hooks or male formations provided on the support assemblies. Height adjustment could be manual instead of via a mechanism as in the above example. The size and shape of the edging panels can be varied to suit each application. The manner in which edging panels are coupled to one another may differ from that described above, and may be independent from the panel supports. Similarly, different locking arrangements for coupled panels are also envisaged. Edging panels may even be welded together, and similarly the support assemblies may weld to the edging panels. Various alternative coupling interfaces for a panel support to couple to one or more edging panels are possible, instead of the locking flanges of the above examples. In a simplified arrangement, a coupling interface may comprise a surface of the panel support that is welded to an edging panel, or otherwise engages an edging panel. It is also possible for a panel support to be integrated with an edging panel to some extent.

Claims

1. A support arrangement for a planter edging system, the planter edging system comprising a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area, the support arrangement comprising:a base; anda panel support configured to act between the base and a respective edging panel to hold the edging panel upright, in use, the panel support comprising a coupling interface for coupling to the edging panel;wherein the support arrangement is configured to enable a position of the base to be adjusted relative to the coupling interface.

2. The support arrangement of claim 1, configured to enable the base to rotate relative to the coupling interface to adjust the position of the base.

3. The support arrangement of claim 2, configured to enable the base to rotate about an axis that extends substantially parallel to the respective edging panel, in use.

4. The support arrangement of claim 2 or claim 3, configured to enable the base to rotate about an axis that extends substantially orthogonally to the respective edging panel, in use.

5. The support arrangement of any of claims 2 to 4, configured to enable rotation of the base about orthogonal axes.

6. The support arrangement of any preceding claim, wherein the panel support comprises an assembly that is adjustable to vary the position of the base relative to the coupling interface.

7. The support arrangement of claim 6, wherein the assembly is adjustable to vary a height of the panel support.

8. The support arrangement of claim 6 or claim 7, wherein the assembly is adjustable to vary an orientation of the base.

9. The support arrangement of any preceding claim, wherein the panel support comprises a first support member that comprises the coupling interface, and a second support member for connecting to the base, wherein the first support member is movable relative to the second support member.

10. The support arrangement of claim 9, wherein the second support member is rotatable about a first axis relative to the first support member.

11. The support arrangement of claim 10, wherein the first axis is generally horizontal when in use in the edging system.

12. The support arrangement of claim 10 or claim 11, wherein the first axis is orthogonal to a plane in which the second support member extends.

13. The support arrangement of any of claims 9 to 12, wherein the second support member supports rotation of the base about a second axis.

14. The support arrangement of claim 13, wherein the second axis is generally horizontal when in use in the edging system.

15. The support arrangement of claim 13 or claim 14, wherein the second axis is parallel to a plane in which the second support member extends.

16. The support arrangement of any of claims 13 to 15 when dependent on claim 10, wherein the first axis is orthogonal to the second axis.

17. The support arrangement of any of claims 9 to 16, wherein the first support member is movable by translation relative to the second support member.

18. The support arrangement of claim 17, wherein the first support member is movable by translation along an axis that is parallel to a plane in which the first support member extends.

19. The support arrangement of claim 17 or claim 18, wherein the first support member is movable by translation along an axis that is generally vertical when in use in the edging system.

20. The support arrangement of any of claims 9 to 19, wherein the panel support comprises an interface module connected between the first and second support members.

21. The support arrangement of claim 20, wherein the interface module is operable to vary a spacing between the first and second support members.

22. The support arrangement of claim 20 or claim 21, wherein the interface module comprises a mechanism for effecting relative movement between the first and second support members.

23. The support arrangement of claim 22, wherein the mechanism comprises a threaded interface.

24. The support arrangement of claim 22 or claim 23, wherein the interface module comprises multiple mechanisms for effecting respective modes of relative movement between the first and second support members.

25. The support arrangement of any of claims 20 to 24, comprising a rotatable coupling between the second support member and the interface module.

26. The support arrangement of any of claims 9 to 19, wherein the first support member is directly coupled to the second support member.

27. The support arrangement of claim 26, comprising a rotatable coupling between the first and second support members.

28. The support arrangement of any of claims 9 to 27, wherein the second support member comprises formations configured to form a rotatable coupling with corresponding formations on the base.

29. The support arrangement of any of claims 9 to 28, comprising locking openings configured to receive a locking element to set a relative angle between the first and second support members.

30. The support arrangement of any of claims 9 to 29, comprising openings configured to indicate a relative angle between the first and second support members.

31. The support arrangement of any preceding claim, wherein the panel support is configured to join adjacent edging panels together.

32. The support arrangement of any preceding claim, wherein the panel support is configured to act as a gusset.

33. The support arrangement of any preceding claim, wherein the base is arranged to lie on a surface on which the edging system is installed, in use.

34. The support arrangement of any preceding claim, configured to enable a position of the base to be adjusted to align with a surface on which the edging system is installed, in use.

35. The support arrangement of any preceding claim, wherein the base comprises a base plate.

36. The support arrangement of any preceding claim, wherein the coupling interface comprises a surface that engages the respective edging panel, in use.

37. The support arrangement of any preceding claim, wherein the coupling interface comprises at least one flange that engages the respective edging panel, in use.

38. A planter edging system comprising at least one support arrangement according to any preceding claim.

39. A planter edging system, comprising a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area, and at least one support arrangement, wherein the support arrangement comprises:a base; anda panel support connected to at least one of the edging panels and configured to act between the base and the edging panel to hold the edging panel upright, in use;wherein the support arrangement is configured to enable a position of the base to be adjusted relative to the edging panel connected to the panel support.

40. The planter edging system of claim 39, wherein the panel support extends generally perpendicularly to the or each edging panel to which the panel support is connected.

41. The planter edging system of claim 39 or claim 40, comprising a set of support arrangements, each support arrangement acting to support one or more of the edging panels.

42. The planter edging system of any of claims 39 to 41, wherein the panel support comprises a coupling interface for coupling to the edging panel.

43. The planter edging system of any of claims 39 to 42, wherein the base is arranged to be loaded by contents of the planting area, in use.

44. The planter edging system of any of claims 39 to 43, wherein each edging panel comprises a planter wall having an inner surface exposed to contents of the planting area, in use.

45. A method of constructing a planter edging system, the system comprising a set of edging panels arranged for end-to-end engagement to form at least part of a boundary of a planting area, the method comprising:connecting a panel support of a support arrangement to one or more of the edging panels; andadjusting the support arrangement to alter the position of a base of the support arrangement relative to the or each edging panel.

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