Chrysanthemum Height Control & Growth Regulation
隐藏域元素占位
Chrysanthemum Height Control & Growth Regulation
Application of Plant Growth Regulators for Chrysanthemum Height Control and Growth Regulation
During the stages of chrysanthemum cultivation—from cutting propagation and potting to bud formation and flowering—issues such as leggy growth, loss of lower leaves, and poor plant structure often arise due to overwatering or improper management, thereby diminishing their ornamental value. Foliar application of plant growth retardants—such as paclobutrazol, uniconazole, and daminozide (B-Nine)—helps control plant height. This results in plants that are short and sturdy, with strong stems, large flowers, and an attractive shape.
Paclobutrazol
For single-stem chrysanthemums, spray the entire plant with 150 mg/L paclobutrazol during the early growth stage, repeating the application every 10–15 days depending on growth vigor. For multi-bloom chrysanthemums (varieties trained to produce 5, 7, or 9 flowers), timely spraying of the same solution after pinching (to induce lateral branching) helps maintain a uniform shape; subsequent applications should be made approximately every 15 days, depending on growth, until the buds begin to show color. For "desktop" chrysanthemums (miniature potted varieties), apply the paclobutrazol solution once after the cuttings have rooted, and then every 10 days after potting until the buds show color. When producing miniature single-bloom potted chrysanthemums, a dwarfing treatment can be applied prior to taking cuttings: spray the growing points and leaves of the mother plant with 1,000 mg/L paclobutrazol solution 10–15 days before propagation. During the subsequent growth phase—once the potted plants have stabilized—spray the leaves and growing tips with 1,000 mg/L paclobutrazol solution one or two times at 15–20 day intervals. For potted African marigold (*Tagetes erecta*) seedlings, drenching the root zone with 2.5–10 mg/L uniconazole or paclobutrazol solution significantly shortens internode length and reduces plant height, resulting in thicker, greener leaves and an increased number of flowers. During the growth period of potted China asters (*Callistephus chinensis*), foliar spraying with 50–100 mg/L paclobutrazol dwarfs the plants and enhances their ornamental appeal.
Daminozide
To inhibit chrysanthemum growth using daminozide, spraying should begin 10 days after planting; the treatment involves four applications at 10-day intervals with a concentration of 150 mg/L. This treatment shortens internodes, resulting in sturdy, robust stems and transforming tall, spindly plants into compact specimens with an attractive overall habit. Treating China aster (*Callistephus chinensis*) with a 0.3% daminozide solution effectively controls plant height. For potted pot marigolds (*Calendula officinalis*), spraying twice with 1000 mg/L daminozide—once between 28 and 35 weeks after sowing and again at the visible bud stage—achieves the ideal height by reducing flower stalk and internode length, while also significantly influencing flowering time. To control leggy stem and leaf growth in greenhouse-grown cineraria (*Pericallis × hybrida*), the root zone can be drenched with 130 mg/L daminozide or 200 mg/L chlormequat chloride solution every 15 days until budding; this produces shorter, sturdier plants and uniform flowering. Foliar spraying of cosmos and marigolds with 0.3%–0.5% daminozide solution significantly reduces plant height and enhances ornamental value.
Uniconazole
Chrysanthemum plants treated with uniconazole show significant dwarfing; leaves become shorter and narrower, and chlorophyll content increases. Flowering is delayed and the display period is extended, thereby enhancing the plant's ornamental value. The dwarfing effect intensifies with higher uniconazole concentrations. Concentrations above 100 mg/L produce a significant dwarfing effect, while concentrations exceeding 200 mg/L also significantly inhibit leaf expansion.
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