The growth rate of Sanya's plants is very fast, the branches and leaves are particularly developed, but there are not many trees that can really grow into towering trees. The trees in the house are to trim the branches a year, otherwise it is too dense and the trees are not easy to grow tall; The trees in the north, due to the arrival of winter, the dead branches and leaves will fall off some, but the trunk of the tree is not affected, and continue to grow in the second year, so the trees in the north are easy to grow into towering trees.