How to Use Plant Growth Regulators in Flower Cultivation
Growth regulators can control the synthesis or metabolism of hormones within flowering plants, alter the distribution of assimilates, and regulate flower growth and development. Their effects can make flower stems thick and short, leaves dark green, and leaf blades thicker. Because stem growth is inhibited, the stem's competition for nutrients during flower bud initiation is reduced
Growth regulators can control the synthesis or metabolism of hormones within flowering plants, alter the distribution of assimilates, and regulate flower growth and development. Their effects can make flower stems thick and short, leaves dark green, and leaf blades thicker. Because stem growth is inhibited, the stem's competition for nutrients during flower bud initiation is reduced, thus enabling the flowers to bloom earlier. Growth inhibitors are usually applied as Flower-promoting King No. 3, which can also be used for tobacco, vegetables, chili peppers, flowers, medicinal herbs, cucurbits, peach and other fruit trees to control shoots and excessive vigor, enlarge fruits, strengthen roots and stems, and optimize quality. Generally, each bottle contains 16 granules; dissolve each granule in 15 kg of water for spraying, applying once every 7-10 days, 2-3 times during the growing period. It can assimilate and induce transmembrane signal transduction in plant cells, forcing the abundant nutrients at the shoot tips to flow back in large amounts, and rapidly weakening the inertial advantage of shoot flushing to a terminal-bud state.
Skillful Application of Plant Growth Regulators to Promote Healthy Flower Growth
Applying plant growth regulators in flower production can not only promote flower growth, control plant shape, induce flowering and fruiting, and prevent flower diseases and abscission, but also significantly improve planting efficiency. Their specific methods of use are described below: Promoting Growth1. Soaking the base of cuttings of poinsettia, tea plant, etc. in a daminozide (also known as hydrazide, B9) solution at a concentration of 5000 mg-10000 mg/L can promote rooting and increase the survival rate of cuttings.
2. Soaking seeds in a gibberellin solution at a concentration of 50 mg-200 mg/L can promote seed germination and growth.
3. When taking cuttings, soak the base of 6 cm-8 cm long rose branches in a naphthaleneacetic acid solution at a concentration of 100 mg-150 mg/L to induce rooting.
Controlling Plant Shape
1. Spraying the stems and leaves of chrysanthemum with a high-concentration ethephon solution of 1000 mg/L can effectively inhibit internode elongation and inhibit flower bud development.
2. Pouring a paclobutrazol solution at a concentration of 500 mg/L onto the soil can promote dwarfing of rhododendron plants, compact plant shape, and enlargement of the canopy; evenly spraying chrysanthemum with a paclobutrazol solution at a concentration of 100-150 mg/L can dwarf the plants.
3. In the early growth stage of rhododendron, pouring a chlormequat solution at a concentration of 2000-10000 mg/L onto the soil where the flowers are planted can dwarf the plants; evenly spraying the leaves of tulips with a chlormequat solution at a concentration of 1000-1500 mg/L about 10 days after flowering can promote plant dwarfing and cause the bulbs to swell.
4. When taking chrysanthemum cuttings, soaking them in a daminozide solution at a concentration of 3000 mg/L, or evenly spraying the entire chrysanthemum plant twice 1-2 weeks after transplanting (with an interval of 7-10 days each time), can promote dwarfing of chrysanthemum plants and enlarge the flowers.
Inducing Flowering and Fruiting
1. Soaking the bulbs of bulbous iris in an ethephon solution at a concentration of 500-1000 mg/L for 12-24 hours can break bulb dormancy and promote earlier budding and flowering. Gerbera and marigold treated with ethephon can bloom earlier; lily plants grown in a greenhouse treated with an ethephon solution at a concentration of 10 mg/L can bloom 1 week earlier. After crabapple, China aster, and marigold are treated with ethephon solution, the number of flower buds on crabapple will be inhibited and reduced, while the number of flowers on China aster and marigold will increase significantly. Treating ornamental fruit-type flowers with an ethephon solution at a concentration of 100 mg/L can increase the fruit-setting rate and accelerate fruit ripening.
2. Spraying flower plants with a paclobutrazol solution at a concentration of 300-500 mg/L can promote flower bud differentiation. Evenly spraying ornamental fruit-type flowers with a paclobutrazol solution at a concentration of 400-500 mg/L can significantly increase the fruit-setting rate.
3. Evenly spraying chrysanthemum plants at the vernalization stage with a gibberellin solution at a concentration of 1000 mg/L can enhance their flowering function. Evenly spraying cyclamen with a gibberellin solution at a concentration of 1-5 mg/L before flowering can promote flowering.
4. Spraying bromeliad leaves with a naphthaleneacetic acid solution at a concentration of 5-10 mg/L can make bromeliads bloom earlier. Evenly spraying the surface of ornamental fruit flowers with a naphthaleneacetic acid solution at a concentration of 50-100 mg/L can delay fruit ripening, thereby extending the ornamental period of flowers and fruits.
Preventing Flower Diseases and Abscission
1. Evenly spraying tulip seedlings with a gibberellin solution at a concentration of 300-400 mg/L can not only promote earlier flowering, but also promote earlier formation of flower pigments and prevent the occurrence of flower blight.
2. Evenly spraying a naphthaleneacetic acid solution at a concentration of 50 mg/L on the flowers and leaves 7 days before the flowers go to market can reduce the natural abscission of flowers and bracts under high temperature and low light conditions.
3. In the late autumn growing season, evenly spraying the canopy of young citrus trees with a chlormequat solution at a concentration of 1000-2000 mg/L mixed with a calcium chloride solution at a concentration of 1%-2% can enhance the cold resistance of young citrus trees. When peach flower buds are opening, evenly spraying with a chlormequat solution at a concentration of 100-1000 mg/L can enhance the cold resistance and stress resistance of the flower buds.
The 3 Major Effects of Plant Growth Regulators on Flowers
The 3 Major Effects of Plant Growth Regulators on FlowersApplying plant growth regulators in flower production can not only promote flower growth, control plant shape, induce flowering, and prevent flower diseases and abscission, but also significantly improve planting efficiency.
Effect One: Promoting Growth
1. Soaking the base of cuttings of poinsettia, tea plant, etc. in a daminozide (also known as hydrazide, B9) solution at a concentration of 5000-10000 mg/L can promote growth and increase the survival rate of cuttings.
2. Soaking seeds in a gibberellin solution at a concentration of 50-200 mg/L can promote seed germination and growth.
3. When taking cuttings, soak the base of 6-8 cm long rose branches in a naphthaleneacetic acid solution at a concentration of 100-150 mg/L to induce rooting.
Effect Two: Controlling Plant Shape
1. Spraying the stems and leaves of chrysanthemum with a high-concentration ethephon solution of 1000 mg/L can effectively inhibit internode elongation and inhibit flower bud development.
2. Pouring a paclobutrazol solution at a concentration of 500 mg/L onto the soil can promote dwarfing of rhododendron plants, compact plant shape, and enlargement of the canopy; evenly spraying chrysanthemum with a paclobutrazol solution at a concentration of 100-150 mg/L can dwarf the plants.
3. In the early growth stage of rhododendron, pouring a chlormequat solution at a concentration of 2000-10000 mg/L onto the soil where the flowers are planted can dwarf the plants; evenly spraying the leaves of tulips with a chlormequat solution at a concentration of 1000-1500 mg/L about 10 days after flowering can promote plant dwarfing and cause the bulbs to swell.
4. When taking chrysanthemum cuttings, soaking them in a daminozide solution at a concentration of 3000 mg/L, or evenly spraying the entire chrysanthemum plant twice 1-2 weeks after transplanting (with an interval of 7-10 days each time), can promote dwarfing of chrysanthemum plants and enlarge the flowers.
Effect Three: Inducing Flowering and Fruiting
1. Soaking the bulbs of bulbous iris in an ethephon solution at a concentration of 500-1000 mg/L for 12-24 hours can break bulb dormancy and promote earlier budding and flowering; gerbera and marigold treated with ethephon can bloom earlier; lily plants grown in a greenhouse treated with an ethephon solution at a concentration of 10 mg/L can bloom 1 week earlier; after crabapple, China aster, and marigold are treated with ethephon solution, the number of flower buds on crabapple will be inhibited and reduced, while the number of flowers on China aster and marigold will increase significantly; treating ornamental fruit-type flowers with an ethephon solution at a concentration of 100 mg/L can increase the fruit-setting rate and accelerate fruit ripening.
2. Spraying flower plants with a paclobutrazol solution at a concentration of 300-500 mg/L can promote flower bud differentiation; evenly spraying ornamental fruit-type flowers with a paclobutrazol solution at a concentration of 400-500 mg/L can significantly increase the fruit-setting rate.