Ulmus pumila belongs to shrub species, its branches have strong and weak main branches. Strong main branches need strong pruning, i.e. large area pruning. On the basis of ensuring the integrity of the tree shape, some newly sprouted branches are selected as the renewal branches to retain and remove the old ones. In addition, it is necessary to make the backbone branches present distinct layers, otherwise the purpose of pruning will lose the beauty of appearance. For weak branches to carry out small pruning, long weak branches should be cut off, to prevent blocking the growth of new branches.
The lateral branch is the place where flowers are born. It is necessary to balance the lateral branch to ensure the smooth formation of flower bud in the later stage. Strong lateral branches are good for flower formation, so weak cutting and light cutting can be done, while weak lateral branches can be cut directly. For branches growing in the same direction, the number of Cross branches can be observed to determine how to comb, so as to ensure that other branches can fully receive sunlight. Can also cut off the growth of bad branches to reduce unnecessary loss of nutrients
When pruning, it is necessary to start from the base of the branch. It is not allowed to cut at random, leaving any part of the branch, otherwise the original tree shape balance cannot be guaranteed. However, the general pruning is mainly aimed at some unnecessary branches, such as dead branches, weak branches, Cross branches, overlapping branches, and extra long branches.
