1, pruning and shaping due to tree potential. Young trees grow vigorously, mainly for shaping, so they should be cut lightly. Strictly control the erect branches, and peel off the upper buds when cutting oblique branches in winter to prevent the growth of erect branches. Through thinning, all pests and diseases, dead branches, artificially damaged branches and long branches are cut off. The upright branches of clustered shrubs should be picked from healthy branches to promote their early flowering.

Mature trees should make full use of three-dimensional space to promote more flowers. When pruning during dormancy, the appropriate parts below the autumn shoots should be shortened, some roots and tillers should be selected year by year, and some old branches should be thinned out to ensure that the branches are constantly updated and maintain a complete plant shape.

The old and weak trees are mainly rejuvenated, and the method of heavy and short cutting is adopted to concentrate nutrition on a few axillary buds, germinate strong branches, and timely remove weak branches, diseased branches and dead branches.

2. Trim and reshape according to time. Deciduous flowering shrubs can be divided into winter pruning (dormant pruning) and summer pruning (post-flowering pruning) according to the pruning period. Winter pruning is generally carried out during the dormant period. Summer pruning is carried out after flowering, with the purpose of inhibiting vegetative growth, increasing the whole plant illumination, promoting flower bud differentiation and ensuring the next year's flowering. Pruning in summer should be done sooner rather than later, which is beneficial to control the growth of overgrown branches. If the pruning time is later, the upright branches have already formed. If space conditions permit, secondary branches can be produced by enucleation to increase the number of flowering branches.

3. Prune and reshape trees according to their growth habits and flowering habits. Flowers bloom in spring, and flower buds (or mixed buds) are planted on biennial branches. Shrubs such as Forsythia suspensa, Prunus mume, Peach, Yingchun and Peony undergo flower bud differentiation in the summer of the previous year, and then bloom in the spring of the following year after the low temperature stage in winter. Therefore, pruning should be carried out when the leaf buds begin to swell after the flowers remain. The location of pruning varies with plant species and pure flower buds or mixed buds. Forsythia suspensa, ebony, peach, Yingchun, etc. 2 -4 full buds can be left at the base of the flower branch for short cutting. Peony can only cut off residual flowers.