What is the best way to grow Lagerstroemia indica?

How to cultivate and maintain Lagerstroemia indica

Variety classification and characteristics of Lagerstroemia indica 1

Lagerstroem

What is the best way to grow Lagerstroemia indica?

How to cultivate and maintain Lagerstroemia indica

Variety classification and characteristics of Lagerstroemia indica 1

Lagerstroemia indica is a horticultural ornamental plant originating in China and widely distributed in central and southern China. After long-term cultivation and domestication, there are many varieties in Wei Zi, which can be divided into Wei Zi, Chiwei, Yin Wei and Cuiwei by color. In the southeast of China, both cultivated and wild Lagerstroemia speciosa have the most red flowers.

Lagerstroemia indica belongs to deciduous shrubs or small trees. Shrubby, 3 ~ 7 meters high; The bark falls off easily and the trunk is smooth. The young branches are slightly quadrangular and slightly winged. Leaves alternate or opposite, subsessile; Oval, obovate or oblong, 3 ~ 7 cm long and 2.5 ~ 4 cm wide, smooth and hairless or hairy along the main vein. The older the trunk, the smoother it is. When touched by hand, the whole plant quivers slightly, so it is also called the tree of Jinger, the tree of itching and the flower of Jishan. Lagerstroemia indica tree looks very light and moist, which gives people a quaint and peculiar feeling visually and has very high ornamental value. It is a very important greening tree species in landscaping. At the same time, Lagerstroemia indica also has the characteristics of thin leaves, dense branches, thick stems and exposed roots, and is also the best choice for making bonsai.

2 Lagerstroemia indica cultivation techniques

2. 1 Selection of growth environment

Lagerstroemia indica is robust and easy to cultivate, and has no strict requirements on soil, but it grows best when planted in deep and fertile sandy loam. Lagerstroemia indica likes light, so it should be planted in the lee or under the south wall of the courtyard. If the light is insufficient, plants will not only spend less or not, but even grow weak and have small branches and leaves. Lagerstroemia indica is cold-resistant, but it should be well protected from cold and heat at seedling stage, and the adult plants over 3 years old do not need heat preservation. Lagerstroemia indica is drought-tolerant and afraid of waterlogging. Water it once a year before germination in spring and after defoliation in autumn. If it is not too dry at ordinary times, there is no need to water it. Drainage should be done well in rainy season to prevent water from rotting roots. Fertilization can be applied after defoliation in winter and before germination in spring every year, such as applying human manure or sesame paste residue, which can make plants grow vigorously and flowers big and colorful in the coming year.

2.2 sowing

Sowing method is generally suitable for mass reproduction. 5438+ 10. When the seeds are ripe in June, collect and dry them in time, pack them in small cloth bags and put them in a ventilated and dry place. By March of the following year, it was soaked in 0.2% potassium permanganate solution for disinfection for 24-48 hours, then the residual potassium permanganate solution was washed with clean water, soaked in warm water at 40-50℃ for 2-3 days, and then taken out and dried for a period of time. When sowing outdoors in the open field, loosen and level the soil in the seedbed, open a sowing ditch with a row spacing of 20-25 cm and a depth of about 3 cm, and then evenly withdraw the seeds into the ditch, and it is better to sow 1 ~ 2 seeds every 3-4 cm. After sowing, ditch and water. Keep cool and moist. The seedlings can come out in about 50 days. At this time, the seedlings should be watered once for intertillage weeding. In particular, the seedling spacing should be 10 ~ 15 cm, and the rest should be pulled out. After 1 year, it can grow to 20 ~ 30cm high, and it can blossom in the next year.

2.3 cutting

The cutting time in spring is usually in late April. When cutting in winter, cut off the thick branches that have blossomed in the first year, and then water them to keep the soil moist. Digging out after Grain Rain in the second year, cutting into cuttings with a length of about 16cm, and inserting them in the prepared loose sand with a spacing of 15 ~ 20 cm and a cutting depth of 2/3. After the cuttings are inserted, water is poured once, and then a layer of fine soil is covered with a thickness of about 5cm. If it doesn't rain, water it after 10 ~ 15 days, germinate in about 40 days, and shade it in May. In July, the height of the seedlings can grow to about 30cm, and at this time, it is necessary to weed and loosen the soil. Until June 5438+ 10, when the seedlings grow to 50 ~ 60 cm, they are watered with decomposed liquid fertilizer for overwintering. In March of the following year, the upper branches of the seedlings were cut off and the seedlings with roots about 30cm high were transplanted. The soil is stable on the second day after planting and watering. Pay attention to watering and fertilization in the future. It will bloom that year.

Summer cuttage can be carried out in June. Select strong annual branches with good lignification and no pests and diseases, cut and grow them to about 65,438+05 cm with sterilized branches, cut off the lower leaves, leaving only two or three upper leaves, insert them into a sterile intertillage seedbed with a depth of about 65,438+00 cm, and then cover them with plastic film and reed curtain for moisture and shade. Spray water 1 time every day after cutting, keep the humidity above 70%, and take root after 45 days. After the cuttings grow new buds, they are gradually illuminated, the plastic film is removed, and fertilization begins two months later. When the cuttings overwinter in the seedbed, they should be well protected from cold and heat, and can be transplanted and planted in April of the following year.

3 Lagerstroemia protection and management

Lagerstroemia indica has strong adaptability and relatively extensive management. Generally, topdressing is applied at the beginning of March: phosphorus and potassium fertilizer are applied once from late May to early June to promote the cultivation and flowering of strong branches; Top dressing with cake fertilizer and water at the end of July and the beginning of September can increase the color of flowers. If diseases are found, spray Bordeaux solution or carbendazim 600 times solution for prevention and control. Lagerstroemia indica mostly blooms at the top of the spring shoots that germinated that year. Because of the strong germination ability in spring, the crown growth will not be very neat, so it needs to be trimmed properly. In order to ensure the normal flowering of plants and form large inflorescences, pruning in winter is very necessary. When planting underground, the branches of the current year should be cut off at the fixed trunk of the main branch to promote the flowering of the branches in the next year; When potted, the budding, withered and overlapping branches must be cut off, and other branches should be cut short above the full terminal bud 1cm, leaving only 5cm to beautify the shape; Cut off some residual flowers in time after flowering, reduce the seed setting rate, reduce nutrient loss and promote the germination and flowering of new branches.