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Lagerstroemia indica should adopt evacuation layered or natural jubilation, which used to be flat-headed in the past. In winter, the flat-headed 1 year-old seedlings are removed, the trunk thick branches are removed, and the auxiliary branches are left. When the new branch is about 30cm long, the main branch is selected for extended branch culture, and the rest is pruned to inhibit the side branches and promote the main branch. During the growing season (dormant period), the height of the tree is 2m, leaving 1.7m to remove the top, cutting off all the secondary branches, and removing the auxiliary branches on the trunk last year.
The next spring, many new branches grew under the incision. Select three or four main branches with suitable directions from the upper part of the trunk for cultivation, and smooth the rest. In the growing period, the middle and lower parts of the trunk sprout and smooth, and the main branches are shortened in winter 1/3. In the winter of the third year, 3-4 new branches germinated at the top of each main branch, and 2 branches remained in dormancy period, which were extremely heavy and short-cut, and the rest were smoothed to form a flat head. After maintenance and pruning, the new branches are extremely heavy and cut short every year, and 2-4 new branches grow in the growing period, and 2 branches are thinned in summer, leaving the top branches. After repeated pruning, the top of the main branch forms a fist-shaped protrusion, and new branches string when flowering.