If you want to know why the old people say this, you must first know what this sentence means. Literally: "Toona sinensis" is a Toona sinensis tree, and "passing the house" means that the height exceeds the house. Then the meaning of that sentence is: if the height of the Toona sinensis tree in the house exceeds the height of the house, the owner will be damaged.
Toona sinensis: also known as Toona sinensis bud, Toona sinensis head, Toona sinensis tree, Toona sinensis day, etc. , native to China, widely distributed in the north and south of the Yangtze River. The height of the tree is not only edible for Toona sinensis buds, but also the first choice for landscaping. People in China have long been used to eating Toona sinensis, which has spread all over the country since the Han Dynasty. Toona sinensis bud is nutritious and has dietotherapy effect, which is mainly used to treat exogenous wind-cold, rheumatic joint pain, stomachache, dysentery and so on.
Therefore, the purpose of planting Toona sinensis trees in rural areas is actually to eat, so it is necessary to pick Toona sinensis buds, which are usually available in spring. There is much rain in the south of the Yangtze River in spring, and the trunk is wet and slippery. The owner will certainly climb the tree in order to pick the buds of Toona sinensis, so it is easy to fall down. Toona sinensis tree is too high, it will definitely hurt and even die. In rural areas, there must have been a case where the owner picked the buds of Toona sinensis and fell to his death, so the old people have the saying that "Toona sinensis will damage the owner when building a house".