Why did Tomb-Sweeping Day hang willow branches?

Willow has a strong vitality, as the saying goes: "intentional planting of flowers, unintentional planting of willows." Wicker lives when inserted in the soil, lives where it is inserted, and goes down year after year, and it becomes gloomy everywhere. There is another saying in Tomb-Sweeping Day: It turns out that China people regard Tomb-Sweeping Day, July 30th and the first day of October as the three major ghost festivals, which are the time for ghosts to haunt and ask for help. In order to prevent the harassment and persecution of ghosts, people put willows and put them on. Willow has the function of ward off evil spirits in people's minds. Influenced by Buddhism, people think that willows can exorcise ghosts and call them "ghost trees". Guanyin dipped willow branches in water to help all beings. Jia Sixie of the Northern Wei Dynasty said in the Book of Qi Yao Min: "Take a willow branch and put it on the house, and a hundred ghosts will not enter the house." Tomb-Sweeping Day is a ghost festival. When wicker sprouted, people naturally inserted willows to ward off evil spirits.