A storage and preservation method for fresh-cut peony flowers

Abstract

The application discloses a storage and preservation method for fresh-cut peony flowers, and solves the problems of low storage period (about 20-30 days) of the existing fresh-cut peony flowers, overlapping of the flower supply period of the high-latitude peony planting base, incapability of effectively prolonging the flower supply period and low storage and preservation value of the cut flowers.

Description

Technical Field

[0001] This invention relates to the field of fresh-cut flower preservation technology, and in particular to a method for storing and preserving fresh-cut peony flowers. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Peonies are an emerging cut flower commodity, and cut flowers have strict time and seasonal requirements. Since nearly 80% of peony cut flowers are harvested from late April to early May, although forcing production can be achieved through flowering period control, the current supply of forcibly cultivated peony cut flowers is less than 1% due to immature technology and cost limitations. This overly concentrated harvesting and short supply period puts significant pressure on sales and logistics, limiting the large-scale expansion of the industry.

[0004] The market demand for fresh-cut peonies is increasing daily. However, due to the lack of convenient and practical preservation methods, the storage period and vase life of fresh-cut peonies are shortened during harvesting, transportation, and storage due to moisture evaporation and nutrient loss. Existing peony fresh-cut flower storage techniques often use low humidity to prevent bacterial contamination, resulting in shorter storage time. After rehydration, the petals fail to open, leading to a short vase life. Increasing humidity, on the other hand, easily causes the fresh-cut flowers to rot and develop spots, which also cannot extend the storage time. The current low-temperature storage period for peony fresh-cut flowers is about 20-30 days, which cannot effectively extend the flowering period. Therefore, the current storage and preservation value of peony fresh-cut flowers is low, and there is an urgent need for a method for long-term storage and preservation of peony fresh-cut flowers. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a method for storing and preserving fresh peony flowers, so as to solve the problem of short storage time of fresh peony flowers.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A method for storing and preserving fresh peony cut flowers includes: pre-cooling, grading, honey washing, sterilization, liquid absorption, drying, and storage; the order of grading, honey washing, and sterilization is not important; the liquid absorption, drying, and storage are all carried out in an environment of 0-1℃.

[0008] The pre-cooling process involves placing fresh-cut peony flowers in an environment of 4-6℃.

[0009] The grading is based on the degree of flower opening, bud diameter, and branch length to select cut flowers, and the cut flowers retain multiple layers of compound leaves;

[0010] The honey washing process involves washing fresh-cut flowers with distilled water until no nectar remains on the surface of the buds, leaves, and branches.

[0011] The sterilization process involves soaking the whole stem of fresh-cut flowers in a diluted solution of a bactericide.

[0012] The liquid absorption process involves soaking the bottom of fresh-cut flowers in a flower preservative, which contains at least a nutrient and a bactericide.

[0013] The drying process involves drying the fresh-cut flowers until there is no liquid remaining on the branches, leaves, or buds.

[0014] In some implementations, cut flowers retain all leaves.

[0015] This invention pre-cools freshly harvested cut flowers to remove post-harvest field heat, inhibit microbial growth, reduce the metabolism of cut flowers, and reduce the consumption of nutrients in freshly harvested flowers.

[0016] The grading process involves selecting and packaging only, without removing the leaves, thus preserving all the leaves of the cut flowers. This allows the fresh cut flowers to retain as much energy as possible, and during long-term storage and preservation, the nutrients stored in the leaves are transferred to the flower heads, providing more energy to the cut flower heads.

[0017] During the bud stage, peonies secrete a large amount of nectar from the outer wall of the bud and the lower epidermis of the sepals. The main component of nectar is sucrose, which serves as a natural culture medium for bacteria and fungi during storage. Therefore, washing the nectar and sterilizing the entire plant further inhibits the reproduction of microorganisms, preventing cut flowers from developing spots, rotting, and spoiling.

[0018] Drying the surface of cut flowers makes it easier to control the humidity during storage, preventing the flowers from developing spots, rotting, and spoiling due to the relatively high humidity during bagged storage.

[0019] In some embodiments, the temperature inside the low-temperature cold storage is 0-1°C, and the humidity is 85%-100%.

[0020] In some embodiments, the gas ratio in the cryogenic controlled atmosphere chamber is: 2% to 3% oxygen and 2.5% to 5% carbon dioxide, preferably 2.5% to 3% carbon dioxide.

[0021] To inhibit the growth of both aerobic and anaerobic microorganisms and reduce the metabolic rate of cut flowers while maintaining the most basic metabolic rate, this invention regulates the gas ratio, humidity, and temperature within the low-temperature cold storage. Simultaneously, a higher humidity setting prevents water loss from the cut flowers, maximizing the maintenance of intracellular turgor pressure. A temperature of 0-1°C can minimize the metabolic rate of the cut flowers while preventing frost damage.

[0022] In some embodiments, the storage involves placing multiple cut flowers in a self-generating modified atmosphere packaging bag, maintaining the humidity inside the bag at 95%-100%, adding 1-MCP, gently pressing to expel excess gas, and then securing the modified atmosphere bag with a rubber band.

[0023] In some embodiments, the precooling involves placing field-harvested peony flowers into a precooling room within 60 minutes and precooling for 3-5 hours.

[0024] In some implementations, the grading involves selecting cut flowers with an opening degree of 2-3 degrees, a bud diameter of 3cm or more, and a branch length of 50cm or more, while retaining all leaves.

[0025] In some embodiments, the washing of nectar involves rinsing the flower buds with distilled water in a pre-cooling chamber, gently shaking them in one direction until no nectar remains on the outer surface of the buds.

[0026] In some embodiments, the sterilization involves immersing whole fresh-cut flowers in a diluted solution of prochloraz and iprodione.

[0027] In some embodiments, the liquid absorption involves trimming the lower end of the flower stem at a 40-50° angle, placing the cut flowers vertically in a container, and soaking the bottom 3-7cm of the flower in a flower preservative for 10-14 hours; preferably, the flower preservative is Keli Fresh General Preservative Enhanced Type or Flower Life 100 General Type Preservative.

[0028] In some embodiments, the drying process involves removing the cut flowers from the container, spreading them out to dry until there is no liquid remaining on the branches, leaves, or buds.

[0029] In some embodiments, the liquid absorption, drying, and storage are all carried out in a constant temperature cold storage.

[0030] In some embodiments, the honey washing, grading, and sterilization are carried out in a pre-cooling chamber.

[0031] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] 1. This invention minimizes the energy consumption and microbial growth of peony cut flowers through pre-cooling and refrigeration. The refrigeration temperature is set according to the water content of the peony cut flowers and the chilling injury temperature of different parts of the branches, leaves and buds. This can not only prevent chilling injury to peony cut flowers, but also inhibit the metabolism of peony cut flowers and the growth of microorganisms to the greatest extent.

[0033] 2. This invention increases the humidity of the refrigerated environment. Through processes such as washing honey, sterilization, and drying, it inhibits the growth of microorganisms and reduces the probability of cut flowers rotting due to harmful organisms. The self-generating modified atmosphere packaging bag further increases the humidity, solving the problems of low humidity in traditional refrigeration causing cut flowers to lose water easily and high humidity in refrigerated storage leading to rapid microbial growth, resulting in spots or even rotting. This extends the storage time of cut flowers to 100-150 days.

[0034] 3. When traditionally storing cut peony flowers in cold storage, considering factors such as volume and rot, only a very small number of single leaves are often retained, while all compound leaves are removed. This invention retains all the leaves of the cut flowers, providing energy to the flower buds during long-term storage and extending the storage time of the cut flowers. Even after 100-150 days of storage, the cut flowers still maintain a good shape and vase life, and the vase life of the stored peony cut flowers can reach more than 7 days.

[0035] 4. The modified atmosphere ratio setting of the present invention takes into account the minimum metabolic rate of cut flowers, the ratio of aerobic and anaerobic respiration, and the balance of aerobic and anaerobic microorganisms. It can reduce the metabolic rate of cut flowers, prevent cut flowers from producing too much alcohol through anaerobic respiration, reduce the reproduction of microorganisms, and extend the storage time of cut flowers. Attached Figure Description

[0036] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0037] Figure 1 This is a vase arrangement diagram of fresh-cut peony flowers provided in Embodiment 3 of the present invention;

[0038] Figure 2 This is a vase arrangement diagram of fresh-cut peony flowers provided in Embodiment 5 of the present invention;

[0039] Figure 3 This is a line graph showing the detection data of hydrogen peroxide in the petals, leaves, and stem segments of fresh-cut peony flowers in a vase, as provided in Embodiment 3 of the present invention. Detailed Implementation

[0040] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0041] As described in the background section, existing technologies for fresh-cut peony flowers have short storage time, are prone to spots, and suffer from severe water loss. In order to solve the above technical problems, this invention proposes a method for storing and preserving fresh-cut peony flowers.

[0042] This invention provides a method for storing and preserving fresh peony cut flowers, including: pre-cooling, grading, honey washing, sterilization, liquid absorption, drying, and storage; the order of grading, honey washing, and sterilization is not important; the liquid absorption, drying, and storage are all carried out in an environment of 0-1℃.

[0043] The pre-cooling process involves placing fresh-cut peony flowers in an environment of 4-6℃.

[0044] The grading is based on the degree of flower opening, bud diameter, and branch length to select cut flowers, with all leaves retained in the cut flowers;

[0045] The honey washing process involves washing fresh-cut flowers with distilled water until no nectar remains on the outer surface of the flower buds and leaves.

[0046] The sterilization process involves soaking the whole stem of fresh-cut flowers in a diluted solution of a bactericide.

[0047] The liquid absorption process involves soaking the bottom of fresh-cut flowers in a flower preservative, which contains at least a nutrient and a bactericide.

[0048] The drying process involves drying the fresh-cut flowers until there is no liquid remaining on the branches, leaves, or buds.

[0049] The embodiments of this invention use three-year-old peony cut flower varieties 'Royal Performance' and 'Yang Guifei Bathing', requiring uniform growth, robustness, and freedom from pests and diseases; 45% imazalil emulsifiable concentrate from Adoma Huifeng Company; 50% iprodione suspension concentrate from Adoma Huifeng Company; Flower Life 100 general-purpose from Floralife Company (USA); and enhanced general-purpose preservative liquid from Chrysal Company (Netherlands).

[0050] Example 1

[0051] This embodiment provides a method for storing and preserving fresh peony cut flowers, including the following steps:

[0052] 1. Pre-cooling: Peony flowers are harvested and cut in the field, retaining all leaves, and placed in a pre-cooling room at 5℃ within 40 minutes for 4 hours.

[0053] 2. Grading: Select cut flowers with an opening degree of 2-3, a bud diameter of more than 3cm, and a branch length of more than 50cm, and retain all leaves.

[0054] 3. Washing the nectar: ​​Wash the flower buds and leaves with distilled water for 1 minute in the pre-cooling room, gently shaking clockwise while washing, until there is no nectar on the outer surface of the buds and leaves.

[0055] 4. Sterilization: Soak whole cut flowers in 1000 times diluted 45% prochloraz solution and 1000 times diluted 50% iprodione solution for 30 seconds each.

[0056] 5. Liquid absorption: In a 0.6℃ cold storage, trim the lower flower branches into a 45° angle, place the cut flowers vertically into a container, and fill the bottom 5cm of the container with a pretreatment solution of Flower Longevity 100 general type and water in a ratio of 1:200, and soak for 12 hours.

[0057] 6. Drying: Remove the cut flowers from the container in a 0.6℃ cold storage and spread them out to dry until there is no liquid left on the branches, leaves, and buds.

[0058] 7. Refrigeration: Bundle 10 pieces together and place them flat in the controlled atmosphere cold storage. Store them in a low-temperature controlled atmosphere storage room. Do not squeeze them. The gas ratio of the controlled atmosphere is 2.5% oxygen, 2.8% carbon dioxide, 0.6℃, and 90% humidity.

[0059] Example 2

[0060] This embodiment provides a method for storing and preserving fresh peony cut flowers, including the following steps:

[0061] 1. Pre-cooling: Peony flowers are harvested and cut in the field, retaining all leaves, and placed in a pre-cooling room at 4℃ within 60 minutes for 3 hours.

[0062] 2. Grading: Select cut flowers with an opening degree of 2-3, a bud diameter of more than 3cm, and a branch length of more than 50cm, and remove the bottom layer of leaves.

[0063] 3. Washing the nectar: ​​Wash the buds with distilled water for 1 minute in a pre-cooling room, gently shaking clockwise while washing, until there is no nectar on the outer surface of the buds.

[0064] 4. Sterilization: Soak whole cut flowers in 1000 times diluted 45% prochloraz solution and 1000 times diluted 50% iprodione solution for 30 seconds each.

[0065] 5. Liquid absorption: In a 0.4℃ cold storage, trim the lower part of the flower stems into a 45° angle, place the cut flowers vertically in a container, and soak the bottom 3cm of the cut flowers in a pretreatment solution made of Keli Fresh General Preservative Enhanced Type and water at a ratio of 1:100 for 12 hours.

[0066] 6. Drying: Remove the cut flowers from the container in a 0.4℃ cold storage and spread them out to dry until there is no liquid left on the branches, leaves, and buds.

[0067] 7. Refrigeration: Bundle 10 pieces together and place them flat in the controlled atmosphere cold storage. Store them in a low-temperature controlled atmosphere storage room. Do not squeeze them. The gas ratio of the controlled atmosphere is 2% oxygen and 2.5% carbon dioxide; temperature 0.4℃ and humidity 85%.

[0068] Example 3

[0069] This embodiment provides a method for storing and preserving fresh peony cut flowers, including the following steps:

[0070] 1. Pre-cooling: Peony flowers are harvested and cut in the field, retaining all leaves, and placed in a pre-cooling room at 6℃ within 50 minutes for 5 hours.

[0071] 2. Grading: Select cut flowers with an opening degree of 2-3, a bud diameter of more than 3cm, and a branch length of more than 50cm, and retain all leaves.

[0072] 3. Washing the nectar: ​​Wash the buds with distilled water for 1 minute in a pre-cooling room, gently shaking clockwise while washing, until there is no nectar on the outer surface of the buds.

[0073] 4. Sterilization: Soak whole cut flowers in 1000 times diluted 45% prochloraz solution and 1000 times diluted 50% iprodione solution for 30 seconds each.

[0074] 5. Liquid absorption: In a 1℃ cold storage, trim the lower part of the flower stems into a 45° angle, place the cut flowers vertically in a container, and soak the bottom 3cm of the cut flowers in a preservative for 12 hours; the preservative is prepared as follows: 2% sucrose and 25mg / L chlorine dioxide, with the remainder being water.

[0075] 6. Drying: Remove the cut flowers from the container in a 1℃ cold storage and spread them out to dry until there is no liquid left on the branches, leaves, and buds.

[0076] 7. Refrigeration: Bundle 10 pieces together and place them flat in the controlled atmosphere cold storage. Store them in a low-temperature controlled atmosphere storage room. Do not squeeze them. The gas ratio of the controlled atmosphere is 3% oxygen and 2.8% carbon dioxide; temperature 1℃ and humidity 95%.

[0077] Example 4

[0078] A method for storing and preserving fresh peony cut flowers, comprising the following steps:

[0079] 1. Pre-cooling: Peony flowers are harvested and cut in the field, retaining all leaves, and placed in a pre-cooling room at 5℃ within 60 minutes for 4 hours.

[0080] 2. Grading: Select cut flowers with an opening degree of 2-3, a bud diameter of more than 3cm, and a branch length of more than 50cm, and remove the bottom layer of leaves.

[0081] 3. Washing the nectar: ​​Wash the buds with distilled water for 1 minute in a pre-cooling room, gently shaking clockwise while washing, until there is no nectar on the outer surface of the buds.

[0082] 4. Sterilization: Soak whole cut flowers in 1000 times diluted 45% prochloraz solution and 1000 times diluted 50% iprodione solution for 30 seconds each.

[0083] 5. Liquid absorption: In a 1℃ cold storage, trim the lower part of the flower stems into a 45° angle, place the cut flowers vertically in a container, and soak the bottom 5cm of the cut flowers in Keli Fresh General Preservative Solution Enhanced for 12 hours.

[0084] 6. Drying: Remove the cut flowers from the container in the cold storage and spread them out to dry until there is no liquid left on the branches, leaves, and buds.

[0085] 7. Packaging and refrigeration: Cover each flower bud with a foam net, bundle 10 together, wrap them with newsprint, and place them crosswise into 20μm self-generating modified atmosphere packaging bags, with 60 buds per bag. Place one 0.5g packet of 1-MCP (1-methylcyclopropene) in each bag, gently press to expel excess gas, and tie the modified atmosphere bag tightly with a rubber band. The humidity inside the bag should be 95%-100%.

[0086] Place the packaged modified atmosphere bags horizontally on the 1℃ cold storage shelf to maintain a stable storage temperature.

[0087] Example 5

[0088] This embodiment provides a method for storing and preserving fresh peony cut flowers. The difference from Embodiment 3 is that the peony cut flower variety used is a three-year-old 'Yang Fei Chu Yu'.

[0089] Comparative Example 1

[0090] This comparative example provides a method for storing and preserving fresh peony cut flowers. The difference from Example 1 is that the proportion of the controlled atmosphere gas in the low-temperature controlled atmosphere storage is 1% oxygen and 2.8% carbon dioxide.

[0091] Comparative Example 2

[0092] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0093] The relative humidity in the low-temperature controlled atmosphere storage is 60%.

[0094] Comparative Example 3

[0095] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0096] The temperature inside the low-temperature controlled atmosphere storage is 3℃.

[0097] Comparative Example 4

[0098] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0099] The step of washing the honey is omitted.

[0100] Comparative Example 5

[0101] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0102] The drying step is omitted.

[0103] Comparative Example 6

[0104] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0105] The sterilization step is omitted.

[0106] Comparative Example 7

[0107] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0108] The pre-cooling step is omitted.

[0109] Comparative Example 8

[0110] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0111] The controlled atmosphere gas composition in the cryogenic controlled atmosphere storage is 20% oxygen and 0.03% carbon dioxide.

[0112] Comparative Example 9

[0113] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that:

[0114] The controlled atmosphere gas composition in the cryogenic controlled atmosphere storage is 12.5% ​​oxygen and 3% carbon dioxide.

[0115] Comparative Example 10

[0116] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that all compound leaves are removed.

[0117] Comparative Example 11

[0118] This comparative example provides a method for storing and preserving fresh peony cut flowers, which differs from Example 1 in that the liquid absorption step is omitted.

[0119] Comparative Example 12

[0120] This comparative example provides a method for storing and preserving fresh peony cut flowers. The difference from Example 4 is that 1-MCP is not placed inside the self-generated modified atmosphere packaging preservation bag.

[0121] Experimental Example

[0122] After storing the cut flowers from Examples 1-5 and Comparative Examples 1-12 for 120 days, cut flowers from each treatment were randomly removed from the cold storage. The base of the flower stems was obliquely cut 2 cm, and the flowers were soaked in deep water for 2 hours. Then, they were arranged in 250 ml Erlenmeyer flasks with tap water as the vase solution. Each flask contained 3 flasks, and each treatment contained 3 flasks, with 3 replicates. The base of the flower stems was obliquely cut 2 cm daily, and the water was changed. The vase temperature was maintained at 25°C, and the morphological indicators of the peony cut flowers were recorded.

[0123] Observation of morphological indicators of cut peony flowers

[0124] Opening rate: The percentage of cut flowers in vase arrangement with a diameter of more than 300% of the bud diameter in each treatment out of the total number of sampled flower branches.

[0125] Disease susceptibility: The percentage of infected flowers out of the total number of sampled flower branches during the storage period for each treatment of cut flowers.

[0126] Overall appearance: Observe and record the morphology of the leaves, buds and stems of the cut flowers after deep water rinsing. The leaf morphology is divided into: bright, relatively bright, withered leaf tip and curled and dried leaves.

[0127] Table 1 Observation of morphological indicators of peony cut flowers

[0128]

[0129] As shown in Table 1, the inventors found through experiments and tests that the cut peonies stored in Examples 1-4 were less susceptible to disease, had a higher relative water content, a higher opening rate after vase treatment, almost no breakage, and a longer vase life, reaching up to 10 days, which is basically the same as the vase life of unstored fresh cut flowers. After vase treatment, the overall appearance of the cut flowers was bright, with no water loss, and the buds and stems were normal. Examples 3 and 4 were the best. In Example 5, the materials used in the experiments of Examples 1-4 were different. After storage and preservation, the flowering period was shortened by 1 day compared to the unstored ones, indicating that there are differences in the storage tolerance of peony varieties, but a good preservation effect can still be achieved. The disease rate, appearance, and vase life of Comparative Examples 1-12 were all inferior to those of Examples 1-5. The technical solution of this application has the effect of improving the storage time of cut flowers, enabling storage for more than 120 days, effectively extending the flowering period.

[0130] Figure 1 and Figure 2 The cut peony flowers from Examples 3 and 5, respectively, showed vase arrangement characteristics. After 120 days of low-temperature storage, the buds were slightly more open than those without storage, the opening process was slightly faster after vase arrangement, the petals opened better, and the vase life was longer, retaining good ornamental value even after 7 days in the vase. Figure 1 Photos of the vase arrangement 8-10 days later were not included.

[0131] like Figure 3 As shown, Figure 3 The data for hydrogen peroxide detection in Example 3 are as follows. The hydrogen peroxide content in the leaves and petals showed a gradual and slow increase with small fluctuations, while the content in the stems remained relatively stable. This change in hydrogen peroxide content indicates that during the opening process of peony cut flowers after long-term storage, the release and scavenging of reactive oxygen species were normal, and the hydrogen peroxide content remained relatively stable. Normal scavenging and release of reactive oxygen species within the plant ensured the normal opening of the peony cut flowers and extended their opening time.

[0132] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for storing and preserving fresh-cut peony flowers, characterized in that, include: Pre-cooling, grading, honey washing, sterilization, liquid absorption, drying, and storage; the order of grading, honey washing, and sterilization is not important; the liquid absorption, drying, and storage are all carried out in an environment of 0-1℃; The pre-cooling process involves placing fresh-cut peony flowers in an environment of 4-6℃. The grading is based on the degree of flower opening, bud diameter, and branch length to select cut flowers, with all leaves retained in the cut flowers; The honey washing process involves washing fresh-cut flowers with distilled water until no nectar remains on the outer surface of the flower buds and leaves. The sterilization process involves soaking the whole stem of fresh-cut flowers in a diluted solution of a bactericide. The liquid absorption process involves soaking the bottom of fresh-cut flowers in a flower preservative, which contains at least a nutrient and a bactericide. The drying process involves drying the fresh-cut flowers until there is no liquid remaining on the branches, leaves, and buds. The liquid absorption, drying, and storage are all carried out in a constant temperature cold storage. The temperature inside the constant-temperature cold storage is 0-1℃, and the humidity is 85%-100%. The gas composition inside the constant temperature cold storage is: 2%~3% oxygen and 2.5%~5% carbon dioxide. The storage method involves placing multiple fresh-cut flowers into a self-generating modified atmosphere packaging bag, maintaining the humidity inside the bag at 95%-100%, adding 1-MCP, gently pressing to expel excess gas, and then securing the modified atmosphere bag with a rubber band.

2. The method for storing and preserving fresh peony cut flowers as described in claim 1, characterized in that: The pre-cooling process involves placing the peony flowers harvested from the field into a pre-cooling room within 60 minutes and pre-cooling for 3-5 hours.

3. The method for storing and preserving fresh peony cut flowers as described in claim 1, characterized in that: The grading process involves selecting cut flowers with an opening degree of 2-3, a bud diameter of 3cm or more, and a branch length of 50cm or more, while retaining all leaves.

4. The method for storing and preserving fresh peony cut flowers as described in claim 1, characterized in that: The washing process involves rinsing the flower buds with distilled water in a pre-cooling room, gently shaking them in one direction until no nectar remains on the outer surface of the buds.

5. The method for storing and preserving fresh peony cut flowers as described in claim 1, characterized in that: The sterilization process involves immersing whole fresh-cut flowers in a diluted solution of prochloraz and iprodione.

6. The method for storing and preserving fresh-cut peony flowers as described in claim 1, characterized in that: The process involves pruning the lower end of the flower stem at a 40-50° angle, placing the cut flowers vertically in a container, and soaking the bottom 3-7cm of the stem in a flower preservative for 10-14 hours. Preferably, the flower preservative is either Keli Fresh General Preservative Enhanced Type or Flower Life 100 General Type Preservative.

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