Trees growing on ancestral graves have many bad effects on future generations.
For example, if the tree grows too big, it will cover the ancestral grave, which will aggravate the moisture in the ancestral grave and seriously cause the imbalance between yin and yang, which is very taboo in geomantic omen and will have a bad impact on the health of future generations.
Moreover, the location where trees grow will also have an impact on the wealth of future generations. If the location is good, it may be helpful to the career of future generations, but the natural growth of trees is generally inappropriate, which is likely to impact the career of future generations and have a negative impact on wealth.