The purpose of pruning seedlings during the nursery is to better play a role in greening and beautifying after planting in the nursery. Nursery period mainly prunes seedlings according to the biological characteristics of tree species and different uses in the future. In the nursery period, ornamental trees mainly cultivate trunks suitable for height, and the height of trunks is determined by their future functions. Street trees are generally more than 2.5 ~ 3 meters; Yin Tingshu depends on the surrounding environmental conditions, generally around 1 meter. Its trunk should extend vertically to form a middle trunk, and the main branches and lateral branches at all levels are evenly distributed around the middle trunk, forming a tree structure with very clear subordinate relationship. It is not difficult for tree species to meet the above requirements, especially those with strong top advantages, as long as they always pay attention to cutting off the sprouting roots and branchlets on the trunk, and at the same time thinning out the branches that are too dense in the crown and disturbing the tree shape. For small trees with weak top advantage, we should choose the trunk with appropriate height, leave 3 ~ 4 main branches on it, and cultivate it into an appropriate short section of evacuation; If it is a strong positive variety, it is generally cultivated into a natural shape, leaving no hollow stems.
Under normal circumstances, bushy shrubs will not be cut into small trees, but still remain in a bushy shape. During seedling raising, we should choose to leave a certain number of suitable main branches and 3 ~ 5 buds above the ground to promote more branches, so as to form them as soon as possible and play an ornamental role. If you want to cultivate the trunk of a clustered shrub with weak top advantage into a small tree, you have to work hard, which usually takes more than three years. In the first year, most of the overgrown branches are cut off, and only the strongest branches in the center are kept for culture; In the second year, the new branches and new tillers at the lower part of the branches are cut off, and at the same time, 3-5 branches at the upper part of the branches are kept, with the middle upright branch as the middle branch and the rest as the main branches; In the third year, according to the basic tree shape of the second year, the newly grown branchlets and tillers on the trunk are cut off, and the new branches on the main branch and the middle trunk are kept. So a cluster of flowering shrubs was cut into a small tree with regular plant shape and distinct layers.
The main task of vine flowers and trees in nursery is to raise roots and cultivate one or several strong main vines. The main method is to cut or level the stubble. Hedge seedlings require many branches, especially at the base, so that the hedge formed in the future can be full and symmetrical. As hedgerows, the height of main branches and the length of side branches of seedlings are often uneven. In order to maintain balanced growth, the height of seedlings should be adjusted during pruning to make it consistent with the diameter of crown. At the same time, it promotes branching and controls height. The planting density of hedgerows is high, so it is impossible for seedlings to have large root groups. Therefore, during seedling raising, the main branches and lateral branches should be cut off again, and the growth of root system should be controlled through the balanced relationship between the ground and the underground, which is convenient for the close planting operation in the future.