Aside from folk customs, has Tang Bohu in Stephen Chow seen Chou-heung? Chuan Chang has a saying that "your grave is for planting trees", which shows that this is not a good word.
Generally speaking, there are trees behind the grave, which are crowned and covered, and are famous. Planting trees beside graves is to take care of ancestors instead of children and grandchildren. Generally, there are many kinds of pine and cypress. Trees are planted in front of graves, and the roots wear coffins. This is taboo and unlucky.
The most unfortunate thing is to plant trees in front of the grave and cover the sky with monuments, that is, to see the sun.
Specifically, you can look at Liaozhai, where there are some similar ghost stories. For example, there is an old camphor tree in a house, its branches are bleeding, there is a coffin under the tree, and the old woman in the coffin has a stranger. The Taoist priest said it was a demon, so the host family did everything.
This is roughly what it means (don't think that serialization is not credible, but also the folklore and imagination at that time made it a story)