Generally speaking, the lush grass (onion) on the grave indicates that the feng shui of the grave may be better. There is also a difference between grass growing on a grave. Generally, sickle grass and bell grass are the best, but if there is no grass, weeds and a mouse hole on the grave, it is the worst.
In ancient times, geomantic omen was highly valued. Feng Shui is a mysterious art with a long history of Han nationality, also known as Kate and Qingnangjing. The comparative academic view is called Kanyu. Wind is vitality and field energy, while water is flowing and changing. Geomantic omen is the art of observing geography on the spot, which was also called geomantic omen theory in ancient times. This is a philosophy that studies the laws of the environment and the universe. Since man is a part of nature and nature is also a part of man, it is normal to achieve the state of "harmony between man and nature".
From the perspective of geomantic omen, finding a bald grave is a taboo: future generations are unlucky, and this grave is soilless. As a Jedi, it is necessary to choose a tomb another day. But there are many reasons why some graves are not suitable for planting plants, but we should analyze them from the most scientific and practical situation. Scientifically speaking, 95% of the reason why plants don't grow is because the soil on the grave is mixed with fragments of firecrackers. Plants can't grow for many years because of too much nitrate and sulfur. As long as firecrackers are set off somewhere when you go to the grave, plants will not grow in this place for several years.