What are the four ancient ghost trees?

The four folk ghost trees: Mulberry, Willow, Sophora japonica and Poplar

Don't plant mulberry in front, willow in the back, and don't plant ghosts to clap your hands in the courtyard. When poplars meet the wind, their leaves clatter like "ghosts" clapping their hands. There is a folk song of "staying at home" circulating in Kaifeng, Henan Province: "Don't plant mulberry in front, willow in the back," Mulberry and mourning are homophonic; "Willow" means that willow branches are often used as "mourning sticks" and "evocation banners" at funerals after the death of parents; "Ghost clapping" refers to poplars, which are mostly planted in the base, and their leaves sound like people clapping their hands in the wind. There is also a folk saying that "there is no locust behind the house".

It is said that in ancient times, there was a custom of respecting Sophora japonica. 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. It is forbidden to plant neem trees in the hospital in Henan province, thinking that neem is a bitter bean, which indicates that the owner eats bitter fruit. However, some people say that the four ghost trees are just things that many people use on the Internet to intimidate people. Just like why they can't look in the mirror at night, they are all superstitious statements, which makes this statement spread more widely.

Extended information:

However, in ancient times, the hierarchy was strict, and there were rules and regulations for planting trees on graves, which could not be violated. There are two kinds of "four ghost trees" that are planted in graves and next to houses, which makes 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 detrimental to anger; Sophora japonica, which sounds like "bad", doesn't matter if you don't plant it; Poplar, the leaves are loud when the wind blows, and thieves don't know when they come. The life experience of the ancients is still strange.

And in ancient times, it was customary to call the woody plants used in 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 as mourning sticks. 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.