Milan should start pruning and shaping from the seedlings, leaving a section of trunk with a height of 15cm to 20cm. Don't let the main branches grow out of the soil, but prune them at the height of 15cm above the main branches to make the plants plump. The lower branches of perennial plants often age and die. Therefore, it is advisable to cut it every other year in high temperature season, so as to promote the germination of adventitious buds at the lower part of the main branch and grow new lateral branches, so that the tree can maintain a symmetrical posture, the tree is vigorous and the leaves are lush.