Spiraea Matgold Cultivar Compact Habit and Color Transition
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Solution Overview
Problem
There is a need for a new cultivar of Spiraea that combines copper red young foliage with deep pink-red flowers, which has not been effectively addressed by existing Spiraea varieties, particularly in terms of compact plant habit and consistent color transition throughout the seasons.
Innovation Solution
The development of the 'Matgold' cultivar, resulting from a controlled breeding program between Spiraea japonica 'Bailcarol' and Spiraea×bumalda 'Denistar', which exhibits a compact plant habit, copper red to lemon gold to copper red leaf color transition, and deep pink-red flower color, achieved through asexual propagation by softwood stem cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a controlled breeding program is conducted to develop Spiraea with copper red young foliage and deep pink-red flowers, then the desired color combination and compact habit are achieved, but the breeding process requires significant time and multiple generations of selection
Solution Approach 1:
The breeding program performed preliminary crosses between selected parent plants ('Bailcarol' and 'Denistar') with known desirable traits, then selected and propagated the best performing seedlings through asexual propagation methods. This preliminary action of controlled crossing and selection established the desired color combination and compact habit in the 'Matgold' cultivar, achieving reliable color consistency without requiring multiple additional generations of breeding.
2Stability of the object's composition
If asexual propagation by softwood stem cuttings is used to reproduce the cultivar, then stable characteristics true to type are achieved, but the propagation process requires specific technical expertise and controlled conditions
Solution Approach 1:
The softwood stem cutting propagation method allows the plant to reproduce itself asexually, with each cutting developing into a complete plant that is genetically identical to the parent. This self-service propagation mechanism ensures stable characteristics true to type while requiring minimal external intervention beyond basic cutting and rooting conditions, making the process relatively straightforward despite the technical expertise needed.
3Volume of moving object
If the cultivar is selected for compact plant habit, then space efficiency and landscape suitability are improved, but the growth rate may be limited compared to less compact varieties
Solution Approach 1:
The breeding program selected for specific parameter combinations that resulted in a compact plant habit (40 cm height, 65 cm width) while maintaining moderate growth rate. The 'Matgold' cultivar achieves this balance through its genetically determined growth parameters, producing a dense, mounded form that is space-efficient for landscape use while still exhibiting healthy growth progression from planting to maturity.
Data Source
AI summary
A new cultivar of Spiraea named ‘Matgold’ that is characterized by compact plant habit, its leaves that are copper red in color when young, changing to lemon gold in summer and changing to copper red in fall, and its flowers that open reddish pink in color and change to pink.