(1) It depends on the different tree species, growth habits and cultivation purposes: in order to increase the amount of flowers, the crown should be ventilated and transparent, so it is necessary to shape the crown into a gratifying shape from the seedlings. Generally, young trees are mainly shaped, and the main branches should be lightly cut to expand the crown and make it rapidly take shape. Adult trees mainly balance the tree potential, so it is necessary to master the pruning of weak branches to enhance the tree potential, and the pruning of strong branches to ease the tree potential. Old trees should be pruned again, so that the preserved buds can get rich nutrition and grow strong branches; Flowers and trees that grow vigorously should be lightly pruned. If the pruning is too heavy, it is easy to cause the branches to grow vigorously, which is not conducive to flowering and fruiting.

(2) According to the types and cultivation purposes of flowers and trees, they can be divided into natural type and artificial type. Natural style is mostly used for foliage and flowering flowers and trees with higher plant types, such as cycads, sundew, brown bamboo, turtle-backed bamboo and so on. And they are generally slightly pruned and drained to make the distribution and arrangement of branches more scientific, reasonable and beautiful. The manual method is to trim into different tree shapes according to people's different hobbies and characteristics of flowers and trees, such as pruning Euonymus japonicus, Euonymus japonicus and Pittosporum japonicum into spheres; Prune drooping peaches, Shui Mei, Tanchun, etc. Become a natural drooping branch; Peony, rose, begonia, jasmine, chrysanthemum, etc. Be trimmed into blocks.