The famous Sophora japonica is a small deciduous tree of Sophora in Leguminosae, which is a variety of Sophora japonica. It has the characteristics of rapid growth, dark green leaves, developed roots and long life. At the same time, the branches are twisted and drooping, and the crown is umbrella-shaped, becoming a semi-spherical shape with a unique and beautiful posture. The grafting method is as follows: 1. The grafting method is from March to April before the germination of Sophora japonica in spring. Firstly, Sophora japonica with strong growth and straight trunk is selected as the rootstock. Because the trunk of grafted Sophora japonica is not easy to grow thick, we should choose the rootstock with thicker trunk as far as possible, and cut off the crown according to the required height, and the section should be smooth and tidy. The scion selects annual branches with the length of 5-7 cm. First, cut the knife on the back of the first bud of the scion, 2 to 3 cm away from the bud, and cut an inclined plane about 2 cm long, then cut the knife on the opposite side and cut it into a wedge shape. At the top of the prepared rootstock, cut vertically downward, and there is a slight xylem inside the cambium, which is equal to the length of the scion. Insert the scion into the rootstock, aim at the cambium on both sides or one side, and tie it tightly with hemp skin or plastic strips. Each plant should be grafted with 3 to 5 scions to form a crown as soon as possible. After 20 days' inspection, the scion germinated and survived. After survival, pay attention to erasing the new buds of the rootstock to promote the growth of the scion. If there is no survival, leave 3 ~ 5 strong buds of rootstocks for bud grafting or socket joint in May and June.

Second, the bud grafting time is May and June, the rootstock is Sophora japonica, and the spring scion does not survive. First, water the rootstock once 10 days before grafting to make the epidermis and xylem fall off. When budding, leave new branches of the rootstock in spring and cut them short by 5 to 7 cm. Scions are selected from axillary buds on the robust branches of the year, leaves are cut off, a little petiole is left, and the buds are cut into shield-shaped buds without xylem of about 2 cm. Cut a T-shaped knife edge on the cut rootstock branch, which is as deep as the xylem and the same size as the bud. Pick with a knife and embed the bud. The upper end of the bud is next to the cross section of the rootstock and tied tightly with hemp rope or plastic strip. 10 days later, check whether the scion is alive. If the petiole of the scion falls off as soon as it touches, it is proved to be alive, otherwise the grafting fails.

3. In addition to bud grafting, the survival rate of socket method is also high. Select the vigorous branches of Sophora japonica as scions, cut off the leaves, and then "twist" them from the base, that is, separate the tree epidermis from the xylem, cut them off when twisting them to 4-5 cm, extract the xylem, immediately cut off the buds with the same thickness of the pre-selected branches of Sophora japonica rootstock, peel them from the top, and put on the scion tube. After peeling and sheathing, leave the rhizome half a centimeter wide for peeling, and the extra Pi Zha is on the tube. No matter whether it is branch grafting or bud grafting, after 1 month, the core should be picked and the new shoots of the rootstock should be smoothed. In the daily management, the branches that grow vigorously after grafting are pruned to form an ideal crown. When grafted seedlings are young, attention should be paid to the prevention and control of aphids and inchworms.