Factors to be considered when pruning: Considering the growth characteristics of tree species, such as germination period and flowering period, except Palmae plants, other trees are generally pruned before the differentiation of leaf buds and flower buds, so as to avoid cutting off leaf buds and flower buds and make flowering trees flourish. The trees modeling effect should be coordinated with the surrounding environment to enhance the landscaping effect and prune them in time; Pruning should be carried out in accordance with the operating procedures, try to reduce the wound, the incision should be flat, and no tree nails can be left; Shade branches, drooping branches, sprouting algae branches and dry branches and leaves below the lower edge line should be cut off in time.

1, street trees can carry out photosynthesis, absorb carbon dioxide and release oxygen; The leaves of trees can adhere to and intercept floating dust, and can prevent the deposited pollutants from being blown up by the wind, so they have the function of purifying the air. According to research, the maximum amount of floating dust deposited on tree leaves can reach 30 to 68 tons per hectare, which can reduce air pollution.

2. Ornamental trees are one of the garden trees classified according to their ornamental types. In addition, it also includes foliage trees, fruit trees, trees, branches and root trees. Flower-viewing tree refers to the tree species in the garden, such as begonia, peony and plum blossom.