Plastic work is usually combined with pruning, and the plastic period and pruning period are unified except for special circumstances. The seedlings in the garden green space bear a variety of functional tasks, so the forms of plastic surgery are also different, but in summary they can be divided into the following three categories. Natural shaping is the most common, labor-saving and easy method to obtain good ornamental effect in garden green space. The basic method of natural shaping is to adjust and promote the crown shape according to the natural growth characteristics of tree species, so as to form a natural tree shape as soon as possible. Long branches, redundant branches, internal branches, combined branches, dead branches, pests and diseases that are disturbed and damaged by various factors should be suppressed or cut off, and attention should be paid to maintaining the symmetry and integrity of the crown. Natural shaping conforms to the growth and development habits of tree species, which can often promote the good growth and robust development of seedlings, give full play to the tree-like characteristics of tree species and improve ornamental value. In order to meet some special purposes in landscaping, artificial shaping can sometimes use more manpower and material resources to cut seedlings into various regular geometric or irregular shapes, such as birds, beasts, castles and so on. Artificial shaping is contrary to the growth and development characteristics of tree species and is not conducive to the growth and development of seedlings. Moreover, if it is not cut for a long time, its shape effect will be easily destroyed, which should be fully considered in specific applications. Natural and artificial mixed shaping is a form of more or less artificial transformation of natural trees for certain requirements of landscaping.

On the basis of the unique natural tree shape of the tree itself, a little manual adjustment and intervention are carried out. Therefore, the trees grow well and are robust, which can give full play to the ornamental characteristics of this tree species. Geometric shaping: the tree species used in this shaping method must have strong germination and branching ability and be resistant to pruning. Wall-style: This molding method can often be seen in European classical gardens. Mainly for greening the walls. Common ones are U-shaped, fork-shaped, rib-shaped and fan-shaped. This kind of plastic surgery should first cultivate a low trunk, arrange the main branches symmetrically or radially on the left and right sides of the trunk, and keep the branches on the same plane. Sculpture: Choose tree species with thick and soft branches, small branches and leaves and resistance to pruning. Using lead wire, rope and other tools, its main branches and lateral branches form a skeleton according to a certain object shape, and then hold the twig tightly with the traction of the rope, or trim the twig carefully according to the imitated object directly, so as to cut it into various sculpture shapes.

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