Brief introduction of Lagerstroemia speciosa

Lagerstroemia indica is a precious environmental protection plant in China. People call it "hundred-day red" and "scratching the itch tree" because it will tremble if it gently moves the bark. This is because this tree trunk is very sensitive to vibration. It is a deciduous tree with a height of10m. Panicle is planted at the top of the branch of the current year, and the inflorescence is very large, 30 ~ 50 cm long, with dozens or more flowers on it; Flowers are about 3 cm in diameter, including white, purple, red and purple; Every summer and autumn, each inflorescence can bloom for about 50 days, and the whole plant can bloom for up to 4 months. (1) Planting 1, ground planting: 1 1 After defoliation, planting in March of the following year. When planting, leave the trunk 100~ 120 cm high and cut off the upper part. After the new spring bamboo shoots grow, choose 3~4 main branches with suitable angles and let them blossom. 2. Potting: Using the seedlings of old branches in the past is a good way to quickly cultivate bonsai. Because the branches of Lagerstroemia indica are soft, potted Lagerstroemia indica can be properly climbed and bound. Generally, when the spring shoots stop growing and the branches tend to be semi-lignified, they are coiled and drawn with thin brown ropes to make bonsai in various postures. (2) General management of fertilization and pest control of Lagerstroemia indica is relatively extensive. Spraying fertilizer in early March, combined application of nitrogen, phosphorus and potassium: applying phosphorus and potassium once from late May to early June to strengthen branches and promote flowers; Apply a flowering fertilizer at the end of July and the beginning of September. The fertilizer is cake fertilizer and water to make the flowers bloom brightly. If diseases are found, use Bordeaux solution or 600 times carbendazim solution to prevent them. (3) Pruned Osmunda japonica grows at the top of spring shoots that germinated in the same year, with strong germination and irregular crown, which needs pruning. 1, winter pruning: In order to ensure normal flowering and form large inflorescences, winter pruning is very important. If planted in the ground, cut off the branches of the current year at the height of the main branches, so that the robust branches can blossom in the next year; First, cut off all sprouting branches, diseased branches and overlapping branches. In order to beautify the shape, the top of the full terminal bud of other branches is cut short at ` 1 cm, generally leaving only about 5 cm. 2. Pruning after flowering: After flowering in summer, some residual flowers should be pruned to prevent them from bearing seeds, so as to reduce nutrient loss and promote the germination and flowering of new branches. Pruning in the growing period is not suitable for pruning or shortening the new branches sprouting in spring, otherwise it will easily lead to only long branches without flowering.