What effect does paclobutrazol have on flowers?

For flowers that need their height controlled and excessive leggy growth prevented, using the plant growth regulator paclobutrazol can slow their growth. It is generally applied as a soil drench, and can also be sprayed on the foliage. For annual bedding plants, 1 to 2 weeks after the seeds sprout, spray with a 30000-fold dilution of 15% wettable powder, and the effect is obvious. Paclobutrazol can also be used to extend the flowering period of certain flowers. Below, let's introduce what applications paclobutrazol has on flowers.

Applications of paclobutrazol on flowers:

① When chrysanthemums are watered with the chemical, the plants can be dwarfed. For a flower pot 10 cm in diameter, use 2.5 to 5 mg of 15% wettable powder per pot; if the effect is not obvious, apply the chemical again after 2 weeks. If the plant has grown to 15 to 20 cm tall, 7 to 15 mg can be applied per pot. Spraying with a 3000-fold dilution of 15% paclobutrazol wettable powder at the bud stage of chrysanthemums can extend the ornamental period. After chemical treatment, the flower diameter may decrease slightly, but there is no adverse effect on flower color.

② Narcissus: When narcissus is grown indoors in winter, high temperatures and weak light cause the plants to grow leggy, with slender stems and leaves that lodge. A 3000-fold dilution of 15% wettable powder can be used to soak the narcissus bulbs, and a 3000 to 6000-fold dilution can be sprayed on the foliage once a week, for a total of 2 to 3 times, which can also control plant height.

③ Rose: Spraying a 2000-fold dilution of 15% wettable powder in the early stage of flower development (the small green bud stage) can extend the flowering period.

④ Poinsettia: After cuttings are planted, drench each pot with 5 to 10 mg of a 7500-fold dilution of 15% wettable powder; for plants 2 to 3 weeks after pinching, drench each pot with 10 to 20 mg of the solution; or when the plant has grown to 5 nodes, spray the foliage with a 900-fold dilution of 15% wettable powder. All of these can dwarf the plants, increase branching, and make the leaves dark green.

⑤ Hydrangea: For potted plants more than 2 years old, spray the foliage with a 5000-fold dilution of 15% wettable powder once every 10 to 15 days, for a total of 3 to 5 sprays. This can prevent leggy growth, make the plant compact, and improve its ornamental value.

⑥ Coreopsis: For potted plants about 10 cm tall that have been pinched 1 to 2 times, spray the leaves with a 1500-fold dilution of 15% wettable powder once every 10 to 14 days, for a total of 3 to 4 sprays. This can prevent leggy growth, make the plant compact, make the leaves dark green, and improve its ornamental value.

⑦ Petunia: Spraying the lower leaves with a 3000-fold dilution of 15% wettable powder can prevent potted plants from growing leggy and keep the plant compact. To avoid delaying the flowering period, do not let the flowers come into contact with the solution when applying.

⑧ Hosta: For robust potted hostas more than 2 years old, spray the leaves with a 1500 to 3000-fold dilution of 15% wettable powder once every 10 days, for a total of 1 to 2 sprays. This can make the plant compact, make the leaves dark green, and reduce the phenomenon of scorched leaf edges.

⑨ Cymbidium sinense: For robust cultivated plants more than 3 years old, spray the leaves with a 150 to 300-fold dilution of 15% wettable powder once every 7 to 10 days, for a total of 1 to 2 sprays. This can make the plant compact and improve its ornamental value.

⑩ Boxwood: Spraying with a 30 to 60-fold dilution of a 4 g/liter suspension concentrate can regulate boxwood growth, with a significant dwarfing effect.