① Seed propagation of Lagerstroemia indica: in June of 10 ~ 1 1, cut the mature ear, dry it and crush it, collect its seeds and store it in dry condition, sow it in March of the following year (no need to accelerate germination), cover it with a layer of fine mud after sowing, and cover it with straw or thatch. After 2 ~ 3 weeks of emergence, the grass should be uncovered in time. When the seedlings grow two pairs of true leaves, they should be shaded, thinned, weeded, loosened and fertilized. In that year, the seedlings can grow to about 40 cm tall.

② Cutting propagation of Lagerstroemia indica: Cutting propagation is a common method to make miniature or small Lagerstroemia indica bonsai, and it takes shape quickly. Before sprouting in early spring, cut off the branches born last year and they will bloom that year; Or in July, cutting semi-lignified branches, and flowering in 2-3 years; Or when digging old piles, the truncated thick roots will be cut off. Generally, strong branches with the length of 10 cm ~ 15 cm (or the cutting length is determined according to creative ideas and ideas) are cut off and inserted into loose soil, and the soil is properly shaded to keep it moist. After cutting, 165438+ was newly eradicated, and it basically grew well from 0 am to 3 pm. Or according to the creator's creative ideas and ideas, cut the ribbon to remove unnecessary branches on the landscape pile, adjust the blank shape, and remove them with a saw or a sharp knife (the length of branches on the landscape pile depends on needs). The incision should be inclined and slippery, and it should be inserted as you take it.

(3) Propagation by ramets: Due to the strong root germination of Lagerstroemia indica, propagation by ramets was carried out in June+10/October, 5438, and the rooted and germinated plants were dug up one by one, separated by sharp edges and planted separately with roots; Or in the rhizosphere near the old pile, select tillers with fibrous roots, cut them down with a sharp knife, and plant them in nurseries or pots to raise blanks. Generally, they can bloom in 2 ~ 3 years.

(4) Shan Ye excavation; Answer: It is suggested that Lagerstroemia indica stumps should not be excavated at will in nature reserves, in front of and behind residents' houses and beside roads, so as not to damage the ecological environment, residents' houses and roads. B. The excavation time is generally from the first ten days of 10 to before germination in early spring, and the cold season and dry weather should be avoided as far as possible. When excavating, first take the old pile head with thick roots, eroded trunk, folds, stone leakage, etc. Dig it out and plant it directly in a pot, or plant it in moist, fertile, loose and breathable soil for cultivation, and then move it into the pot when the roots resume to grow and the branches and leaves flourish.

2 Upper basin

① Selection of basin: Choose purple sand pottery basin or glazed pottery basin.

② Planting: Transplanting is generally carried out after defoliation in autumn and before germination in spring. Because crape myrtle should be transplanted with soil balls as far as possible in order to protect fibrous roots. At the same time, prune some branches on the basin. Pay attention to pad the drainage holes at the bottom of the basin before planting to prevent water accumulation; When planting, the root system should be stretched and not bent in the basin soil; Pay attention to the correct positioning and adjust the posture and position of the stump; After planting, we should strengthen management, often water the pot soil to keep it moist, put it under a shade shed for a while, and then move it to a sunny and ventilated place when it grows vigorously.

③ Soil: The cultivation soil requires loam with rich organic matter and good drainage, and 5 parts of rotten soil or sandy soil (wet mud sand), 2 parts of burnt soil (fire clay) and 0/part of coal cake ash can be selected and fully mixed.

3 modeling

① Multi-stem (branch) twisting can be used to thicken the trunk of Ziwei bonsai. The sprouting branches in the rhizosphere of Lagerstroemia indica are spirally wound along the trunk one by one and fixed with a string to prevent loosening. After 2 ~ 3 years, the branches and trunk can heal together and become a whole, which makes the trunk obviously thicker and looks antique; Lagerstroemia indica seedlings of different colors can also be planted together in a hole, the base is tied together with brown silk, the trunk is intertwined, twisted together and fixed with string. After 3 ~ 4 years, the trunk is vigorous, simple and thick, with rich colors and unique features.

② Lagerstroemia indica is a deciduous tree species, which began to defoliate in the middle of 5438+ 10 under natural conditions. In order to prolong the leaf viewing period after flowering, the old leaves can be picked in early September. Note that when picking leaves, the leaves on a branch should not be picked at once, but in batches. After picking leaves, spray water on branches and remaining leaves frequently. New leaves appear in 15 ~ 20 days, which are small and red.

(3) Pruning and shaping of Lagerstroemia indica L. generally, the intensity pruning is carried out once in winter. When pruning, the branches are evenly distributed and the crown is complete, and the branches that are too prosperous and inappropriate parts are cut off. The branches that are too prosperous are cut short by 2/3, and the branches are generally kept about 6cm in the last winter pruning; In spring, when the new branches grow to about 15cm, the core is removed and the lower part remains about 10cm to promote the growth of the top branched branches. When the forked branches grow to about 20cm, the core is removed again, and the lower part is about 15cm, so as to promote the germination of new branches, and all other branches that affect the appreciation and modeling are removed.