2. Trim the color block with scissors, otherwise the trimmed color block will be uneven, and the bush ball will be trimmed in circles, with clear lines and smooth surface, and finally it will present the shape of a ball. Thinning, cutting and auxiliary pruning are often used in landscape modeling and tree pruning. Thinning: refers to cutting off branches from the base, which can remove pests and diseases, dead branches, too dense cross branches and branches that conflict with municipal facilities; Short cut: refers to the pruning method of removing some annual branches; Auxiliary pruning: including shrinkage, core removal, tip cutting, carving, bud removal and other methods.