Trees grow on the grave, not grass, but feng shui.

If there is no grass on the grave, there are two versions. The first view is that this is an ominous sign, indicating that the geomantic omen in this place is very bad, and even tenacious grass is unwilling to grow here. The second view is that this is a good sign, because it is auspicious to grow grass on the grave, which shows that the feng shui in this place is better, so there will be a phenomenon of growing grass. If the grass on the grave grows luxuriantly and evenly, it means that this land is a better place.