May 13 is a traditional festival in China, commonly known as Rain Festival or Bamboo Drunk Day. According to traditional festival books, Bamboo Drunk Day is the day to plant bamboo. In the Song Dynasty, Fan Zhiming wrote in "Yueyang Geography": "May 13th is the birthday of the dragon, and bamboo can be planted. Qi Yaomin Shu called it the day when bamboo was drunk." Because of the rich traditional images of bamboo, poets of past dynasties have left many poems related to the bamboo sea. Lu You has "Seven Pu Poems": "I once asked when Zhu was drunk and asked Liu when he would sleep." In the Qing Dynasty, Du Jun wrote in "After a Quick Tour": "This year, the bamboo sea is drunk, the rain is good, and the water in Harada is not small." According to historical records, Bamboo Drunk Day is also called "Bamboo Fan Day". "When I was young, I was widely remembered? Summer? " "Bamboo Fanri" quotes Liu Yanshi's poem "Bamboo Fanri Planting Bamboo" in Song Dynasty: "Plum steaming is too moist, and bamboo drunkenness has gone from ancient times; Digging the ground to talk about planting a few bamboos, opening the curtain is still a cloud. "
On the moon, bamboo gets drunk every day. Literally, it coincides with the moon in early summer and the sunshine in May. Generally, it means early summer and May.