Sweet cherries should bear a lot of fruit. After about 15 years, due to the extension of the axis of most fruiting branches, the fruiting parts are far away from the mother branches, and the growth and fruiting ability is obviously weakened. However, in the aging period, the tree vigor is obviously weakened, and the fruit yield and quality are decreased, so it should be updated in time. The task of pruning is to update the crown and cultivate new branches, select some branches and buds in the right direction, and restore the crown skeleton through cultivation.

In the process of regeneration, dense branches are mainly treated, and fruiting branches are cultivated in the exposed area of the inner hole. The big branches that need to be updated should be carried out in stages and batches to avoid thinning too many branches at a time and weakening the regeneration ability of the crown. When the big branch is updated, if a flourishing branch is planted on it, it can also be updated at the upper end of this flourishing branch and cultivated as the main branch in the future. Most of the inner cavities of old trees are exposed, and branches can be cultivated into big branches or fruiting branches by using the inner cavities of crown, which need to be pruned heavily and short to weaken their growth potential, promote branches and form fruiting branches as soon as possible. The time for renewal is early spring germination and good behavior. If only the upper part of the backbone branch is weak and there are strong branches in the middle and lower part, it can also be shrunk to strong branches for renewal, so that the tree potential can be restored as soon as possible.