1, cloves should be pruned before germination, and excessive dense branches, weak branches, pests and diseases, and intermediate branches should be removed to make the crown breathable.

2. After the flowers wither, the residual flowers and two buds at the lower part of the ear can be cut off to reduce nutrient consumption and promote the germination of new branches and the formation of flower buds.

3. After defoliation, it can be pruned 1 time to keep the crown round and beautiful, which is beneficial to the growth and flowering in the coming year. There are few pests and diseases of lilacs, and aphids are the main pests. Spraying 40% dimethoate emulsion with 800 ~ 1000 times or 25% thiophosphate emulsion with 1000 times can control them.