The flower branches of poinsettias cultivated using conventional methods will grow too high, affecting the ornamental effect. In order to make the poinsettia plant shorter, pruning and pruning should be carried out in time, and the branches should be bent in time as they grow. When the branches grow to 15 cm, bend them once and tie them with small strings. If the branch is hard, do not bend it hard to avoid using too much force and causing the branch to break. Allow the plants to bathe in the sun for a few hours before bending. In this way, the branches can become softer due to water loss. However, using this traditional "twisting branches and bending" technique to dwarf the plants is labor-intensive and time-consuming. The use of plant growth regulators, paclobutrazol root irrigation or spraying, or the use of chlormequat, can inhibit the growth of plants to reach the required height. The method is simple and easy to implement, saving labor and time.

After the poinsettia grows to 2 years old, cut off part of the main trunk in mid-to-late September. Spray 0.4% chlormequat after half a month, spray once every half month, and spray 4 times every three months. Once, avoid getting water on the stems within 2 days after spraying. The poinsettia treated with chlormequat has thick stems, shortened stem nodes, compact and plump plant shape, thick bright green leaves, and gorgeous bracts.

In addition, taking advantage of the poinsettia's strong sprouting and tillering characteristics, the cultivated old plants were turned back for the last time in early August, leaving only 2 branches of the branches, and strengthening fertilizer and water management to encourage them to germinate and grow young branches. In mid-to-late August, cut off excess twigs, leaving 6 twigs per plant. When the twigs grow to 5 to 8 cm, they can be treated with paclobutrazol. Cut the strong twigs cut off when you look back for the last time to 10 to 15 centimeters long for cuttings. After cutting, spray with full light and take root in about 15 days. These cuttings can also be treated with paclobutrazol.

Use 800 to 1000 times of 15% paclobutrazol wettable powder for root irrigation, or spray 500 to 600 times of solution. Use 2 to 3 times to achieve the ideal dwarfing effect.

The time to use paclobutrazol for the second time is when the young leaves on the stem tips of the plant begin to stretch after the first use. If used too early, it will easily cause the plant leaves to curl and cause poor growth due to excessive suppression. If the medication is applied too late, the stem nodes of the plant will have elongated, and the dwarfing effect will be poor. The last time of use is from late September to early October. Spray 0.2% potassium dihydrogen phosphate once in October to promote green leaves, large flowers and bright colors on the plants.