2. Pruning: Pruning refers to cutting the branches or trunks of seedlings short. Pruning should be carried out according to the needs of seedling tree shape and growth and development. Cut off pests and diseases, decaying branches, competing branches, over-dense branches and sprouting branches, the incision must be smooth and not split, and the incision of over-thick branches must be smeared.
3. Shaping: For trees with abnormal or irregular crowns, the main branches or side branches that grow too vigorously on one side can be cut off, or the strong main branches can be cut off and replaced with outward side branches. If the crown of the tree is tilted due to the lack of branches on one side, the branches on both sides can be pulled by ropes to make up for the defect. As a street tree, pine trees should increase their branching points when they grow up. Several main branches in a round can be removed one by one, and the rest can be removed after the wound is initially healed.