2. When planting trees in front of the grave, you must plant even numbers. Be 3 meters away from the grave, so that the roots will not grow into the grave. Cinnamomum camphora, Toona sinensis and Sophora japonica are not suitable for planting in graves, because these types of roots are developed and it is easy to grow in graves.
There is a folk custom to put snakes on ancestral graves. If this snake is not dead, it can bless three generations. Snakes, also known as dragons, have a very auspicious symbol in geomantic omen. But these statements are superstitious and biased, and most of them seek psychological comfort. Don't take them seriously.