Meiyu season, also called Huangmeitian, refers to the natural climate phenomenon of continuous rainy days in the middle and lower reaches of the Yangtze River and Taiwan Province Province. At this time, the utensils are easy to be moldy, so it is also called "moldy rain" or "mildew" for short; It is also called "Plum Rain" or "Huang Meiyu" because plums in the south of the Yangtze River are yellow and ripe. It is recorded in China's historical records. For example, The Book of Beginners quotes Plum Rain Ripe compiled by Emperor Liang Yuan in the Southern Dynasties, and Plum Rain by Liu Zongyuan in the Tang Dynasty: "Shi Mei welcomes rain, which is infinitely worth late spring." Wait a minute.