When planting large seedlings over 3 ~ 4 years old, it can be re-cut first, and the branches above 30 ~ 50 cm at the base of the plant can be cut off to reduce transpiration, promote new branches and make the crown plump. When the central main branch of the young tree reaches a certain height, it should be pruned as needed, and 4 ~ 5 strong branches should be left for main branch culture, so that they can be scattered up and down with the spacing of 10 ~ 15 cm. Cut off the top of the main branch and leave a bud or lateral bud under the incision. If the angle between the main branch and the trunk is small, leave buds, otherwise, leave lateral buds and peel off the other pair of buds. Too dense lateral branches can be sparse as soon as possible. When the main branch is elongated to a certain extent and the interval is large, it is advisable to keep strong branches for lateral branch culture, so that both the main branch and the lateral branch can receive sufficient sunlight. Gradually prune the supporting branches left before the central main branch, and cut off the useless branches at any time. After flowering, cut off the two branches left by the branches of the previous year to promote new buds to grow from the old leaves, and flower buds can grow from the tips of the branches. If there are no seeds left after flowering, you can cut off the residual flowers to accumulate nutrients, and bloom will flourish in the coming year.