Sparse means cutting branches from the base. Through thinning, the stump has good ventilation and light transmission, concentrated nutrition supply and vigorous growth. Early thinning of young trees is beneficial to normal development and growth. Pruning during plastic surgery can make the remaining modeling branches get sufficient nutrition and accelerate molding. The molded stump bonsai can balance nutrition by thinning, making it old and enduring.

Short cutting, that is, cutting the long branches short, stimulates the axillary buds under the cut to germinate and form strong side branches, thus achieving the purpose of promoting their branches and facilitating modeling. In plastic surgery, after thinning the redundant branches, it is necessary to cut the remaining modeling branches short, so that the modeling branches sprout 2 ~ 3 times a year. Once sprouted and chopped, the number of branches of modeling branches will increase rapidly, and the order of each branch will be shortened without lengthening the branches. Therefore, short cutting is an effective measure to control the growth of stump bonsai and maintain its dwarfing, and it is also an important means for stump to have the shape and shape of a big tree as soon as possible.

Shrinking and pruning, that is, shrinking and pruning perennial branches, is a powerful measure to shrink big trees and an important means to promote the germination of new branches and restore tree vigor. For garden plants with good stump posture, but large crown and long main branches, it is impossible to meet the requirements of garden modeling only by cutting short annual branches. By cutting down, big trees can be made smaller, which is beneficial to landscape modeling. For some tree species with strong germination ability, the amount of branch shrinkage can be larger, that is, pruning branches and leaves, only retaining the skeleton of the stump to stimulate the germination of new branches under the incision.