Pruning before planting 1. Before planting, the root system of seedlings should be trimmed, the cracked roots, diseased roots and excessively long roots should be cut off, and the crown should be trimmed to keep the balance between the ground and the ground. 2. The pruning of trees should meet the following requirements: 1) Tall deciduous trees with obvious trunks should keep their original tree shapes, and the branches should be properly thinned. The main branch should be cut on the robust bud, and the branch can be cut 1/5 ~ 1/3. 2) For deciduous trees with inconspicuous trunk and dense branches, trees with trunk diameter above 10cm can be thinned to keep the original tree shape; For seedlings with a trunk diameter of 5 ~ 10 cm, several lateral branches can be left on the trunk, and the original tree shape can be kept for short cutting. 3) Evergreen trees with dense branches and round crown can be thinned appropriately. The seedlings at the top of the trunk with branches and leaves cannot be pruned. When evergreen trees with whorled lateral branches are used as street trees, 2 ~ 3 layers of whorled lateral branches at the base can be cut off. 4) Evergreen conifers should not be pruned, only the branches of pests and diseases, dead branches, weak branches, over-dense whorls and drooping branches should be pruned. 5) For trees used as street trees, the stem height should be greater than 3m, all branches below the first branch point should be cut off, and branches above the branch point should be drained or chopped as appropriate, and the crown prototype should be maintained. 6) The crown of precious tree species should be sparse. 3. Pruning of shrubs and vines should meet the following requirements: 1) Bare-rooted seedlings with soil balls or soil in wet areas and flowering shrubs with differentiated flower buds in the previous year should not be pruned, and dead branches and pests and diseases should be cut off. 2) Large shrubs with dense branches can be thinned appropriately. 3) For grafted shrubs, the sprouting branches of the rootstock below the joint should be cut off. 4) Shrubs with obvious branches and small shrubs with new branches and flower buds should be strongly cut according to the tree potential to promote the growth of new branches and the regeneration of old branches. 5) Trees and shrubs used as hedges can be pruned according to the design requirements after planting. Hedges formed by nursery cultivation should be renovated after planting. 6) Climbing and vine seedlings can cut off long parts. Climbing seedlings can cut off staggered branches and lateral branches. 4. The quality of seedling pruning should meet the following requirements: 1) The cut should be smooth and not split. 2) When the branches are cut short, the outer buds should be left, and the cut should be above the bud position 1cm. 3) When pruning large branches and thick roots with a diameter of more than 2cm, the section must be flattened and coated with preservatives.