Is it good or bad to plant trees on graves? According to what book, who said that? Thank you.

No, if the roots are too long, they will be inserted into graves and coffins, which will affect the health of the descendants of the deceased. If the root of the tree entangles the bone, the descendants of the deceased will be entangled, such as entering the skull of the deceased, and the descendants of the deceased will suffer from a flat headache.

My information comes from the thousand volumes of "The Secret of Earth and Atmosphere" handed down to my guru by the founder of Qingcheng School. The information in it is a study of geomantic geography.