When the chrysanthemum plant grows to the height of 10 cm, it begins to pick the core. Only 4 ~ 5 leaves are left at the base of the plant when coring, and all the upper leaves are removed. When 5 ~ 6 new leaves grow, pick the core again, keep 4 ~ 7 main branches, and pull out the branches and buds that grow later in time. Tapping can make plants branch, effectively control plant height and improve plant type. When the core is picked for the last time, the chrysanthemum plants should be trimmed, too many branches and branches that are too strong and too weak should be removed, and 3 ~ 5 branches should be kept. When the buds appear in September, the lateral buds should be picked, leaving only one bud at the top of each branch.