When can the trees on the grave be cut down?

I'm sure everyone has heard the saying that you should lean against a big tree to enjoy the cool. In fact, this sentence is related to Feng Shui. We should also know that trees may grow around the cemetery, some trees grow on both sides of the grave, and some trees grow behind the grave. In fact, if a tree grows behind the grave, it means that future generations will have a backer, and it also means that ancestors have laid a foundation for future generations, and future generations can rely on the blessing of their ancestors to be rich and happy all their lives. Therefore, if the tree grows behind the tomb, as long as the root system of the tree does not destroy the tomb Jintan, there is no need to cut it down, because this is a good omen for geomantic omen.