Dragon Boat Festival is a poisonous day and an evil day in the eyes of the ancients. This idea has been handed down in folk beliefs, so there are various customs of seeking peace and solving disasters. In fact, this is because the summer weather is hot and dry, people are easy to get sick, and the plague is easy to spread; In addition, snakes and insects bite easily, so be very careful, which forms this habit.
"The Story of Jingchu Times": "Mourning is a person, and it is poisonous gas hanging on the door." People usually tie mugwort leaves, banyan trees and calamus into a bundle with red paper, and then insert them or hang them on the door. Inserting wormwood at the door represents a hundred blessings and can make the owner healthy.