Poplar itself has a strong apical advantage, strong germination and relatively weak branching ability. Through proper pruning, the ideal trunk and plump lateral branches can be cultivated, making the tree complete, symmetrical, compact and firm. Populus davidiana is suitable for pruning in winter and summer Generally, plastic pruning is mostly carried out in the summer and autumn tree growing season. Through shaping and pruning, the cut branches can be cut and propagated. Shaping is generally aimed at small trees, and pruning is aimed at big trees (or big seedlings). Seedling pruning is of great significance to the future tree body and posture. Poplar seedlings generally have obvious main stems, and most of the lateral branches are born in the middle and lower parts of the tree. Trunk is generally not used for plastic pruning. The purpose of keeping trunk is to keep the growth potential of the top, so that the tree can grow straight and tall in the future. For the lateral branches at the base of young trees, the whole branch can be cut short; Or cut it lightly and cut it short, leaving only a few buds. Boxwood as an ornamental tree has many spires and cones. Under normal circumstances, the pruning of adult trees is only to cut off the long branches and competing branches growing on the trunk to avoid the phenomenon of double-headed and double-dry. If there is a phenomenon of bulls, which affects the height development of the crown, we should find out the main branches or replace them as soon as possible to cultivate high growth advantages and make the lateral branches evenly distributed. Generally, when cultivating skeleton branches, only 30 ~ 40 cm trunk is exposed at the lower part, and the main branches are evenly distributed at the upper part; Depending on the future application, you can also keep the trunk high as needed.