As the saying goes, "Don't plant mulberry before, don't plant willow (Sophora japonica) after, clap your hands when you enter the hospital". It is said that "mulberry" is connected with "mourning", and planting mulberry in front of the house will "mourn" in front of it; If the willow tree doesn't bear fruit, the willow tree behind the house won't have boys. Saying "sneak back (willow)" will spend all the money; Poplar meets the wind, and the leaves clatter like "ghosts". These trees will be unlucky if they are planted in the wrong place. Also, cypress trees are not allowed to be planted in the hospital, saying that cypress trees are symbols of ghosts; There are no dead trees in the hospital, which means that the family is dead. Therefore, if the trees in the courtyard die, they should be uprooted immediately and new trees should be planted immediately.