Don't plant mulberry before planting willow, clap your hands in the yard. Poplar meets the wind, and the leaves clatter like "ghosts". There is a folk song "House Avoid" circulating in Kaifeng, Henan Province: "Don't plant mulberry before, willow after, clap your hands in front of the door." Sang and mourning are homophonic; "Willow" refers to the fact that willow branches are often used as "mourning sticks" and "evoking souls" at funerals after parents' death. "Ghost clapping" refers to poplars, many of which are in the base, and the leaves make people clap their hands in the wind. There is also a folk saying that there is no locust behind the house.

It is said that there was a custom of honoring Sophora japonica in ancient times. In ancient times, Sophora japonica was a symbol of good luck, longevity and official position, so it was forbidden to plant Sophora japonica in the back of the house. In Henan province, the planting of neem trees in hospitals is prohibited, and it is considered that neem trees are bitter beans, indicating that their owners eat bitter fruits. However, some people say that the Four Ghosts Tree is just something that many people use to intimidate people on the Internet. Just like why they can't look in the mirror at night, they are all superstitious statements, which make this statement spread more widely.

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But in ancient times, the hierarchy was strict, and there were rules for planting trees on graves, which could not be violated. There are two kinds of "four ghost trees", which are planted in graves and beside houses, making people uncomfortable. Coupled with comprehensive factors, the ancients did not want to get into trouble.

Sang, the sound is close to "mourning", which sounds too awkward; Willow, the sound is close to "flow", which is not conducive to anger; Sophora japonica, which sounds like "bad", doesn't matter if you don't plant it; Poplar, the wind blows the leaves, and the thief doesn't know when to come. The life experience of the ancients is still very strange.

Moreover, in ancient times, it was customary to call woody plants used for funerals ghost books, which can also be said that the dead wanted to take them to the underworld. First of all, willow trees are used for mourning. In order to express the filial piety of children and grandchildren, it was finally inserted on the head of the tomb, meaning that children and grandchildren are accompanied.