2. Prune in winter. Also known as dormant pruning (generally 65438+February to February of the following year). It is best to plant trees with poor cold tolerance in early spring to avoid cold wounds. Deciduous trees generally shed their leaves in winter and germinate in the next spring. Pruning in winter has great influence on crown formation, new shoot growth and flower and fruit branch formation of ornamental trees.

3. Prune in summer. Also called growth pruning (usually from April to 10). From bud germination to defoliation, that is, before the new bud stops growing. The specific pruning date should also be different according to the local climatic conditions and tree species characteristics. For example, when pruning flowering fruit trees, it is necessary to cut off inner branches, upright branches, useless branches, excessively dense cross branches, weak drooping branches, pests and diseases, etc. , so that nutrition is concentrated on the backbone branches, which is conducive to flowering and fruiting. Hedge pruning in summer mainly keeps it clean and beautiful. Other garden trees are trimmed into different shapes according to functional requirements.