You can prune apple trees during Qingming Festival. If the tree has not been pruned or has not been pruned carefully during this period, pruning can still be carried out to remove upright strong branches, overly dense branches, thin branches, overlapping branches, cross branches, and diseased and insect-infested branches on the back, so as to improve the illumination in the canopy and eliminate excessive flowers. For trees with many trees, some flower buds can be appropriately thinned out to control yield, improve fruit quality, and prevent annual fruiting.