Is it good for Feng Shui to plant trees in ancestral graves in cemeteries?

It is beneficial to plant trees around the grave. It should be good behind the grave. But the grave is not good. Look at ancient tombs, famous tombs or houses. Left and right are like left and right generals, protecting each other. The latter is like a backer. Trees can be psychic and grounded. The meaning of the land can be understood and understood better than the grave. Would you be comfortable if someone stepped on your head? Physically, in life and work and so on. ...