Second, the pruning method 1, short cutting: short cutting is a very common pruning method, mainly for annual branches, cutting them short to promote the growth of branches and the development of lateral branches. Usually, the pruning length is one third, and 2-3 long branches will grow at the cut, and the new branches can grow to about 30-50 cm in that year.
2. Thinning: If the top of the ginkgo tree is too dense, and the cross branches and overlapping branches are clustered, which affects the internal ventilation and light transmission, it needs to be thinned properly. Thinning can also play a preventive role by cutting off long branches, weak branches and drooping branches, and erasing buds with bad direction when sprouting.
3. Retraction: Retraction is similar to short cutting, but it is mainly aimed at old branches, and the pruning is stronger. Generally, only half the length of the original branch is kept, and only one third can be cut off for some thicker branches. It should be noted that the diameter of the incision should not exceed 5 cm.
4, coring: For any plant, coring is necessary, in addition to controlling plant height, it can also promote branch growth. Potted ginkgo biloba needs to be pitted more, which can prevent it from continuing to grow upwards and is of great help to control the tree shape. Generally, when the branch grows to 15 cm, the terminal bud is removed to promote the secondary growth of the branch.
5. Ring cutting: Cutting the cortex of branches of ginkgo tree to the depth of xylem with a knife can promote its flowering and fruiting, but it is generally only used for vigorous branches. Although ring cutting of weak branches can also promote growth, the result is often not as good as that of thick branches because of limited nutrition.