Why is Longjing delicious before the rain?

Longjing tea before rain is a kind of Longjing tea in West Lake. It refers to Longjing tea collected in front of Grain Rain. Longjing tea is divided into Shifeng Longjing, Meiwu Longjing and West Lake Longjing due to different producing areas. It first appeared in the Song Dynasty and flourished in the Ming Dynasty. Longjing tea was made before Tomb-Sweeping Day and before Grain Rain, and it was called "before the rain". There is a saying that "it is a top grade before it rains, and a treasure before tomorrow". Longjing tea is brewed, but the buds are upright and the soup is fragrant, especially for those with one bud and one leaf, commonly known as "one flag and one cannon". Xu Cishu, a native of Qiantang in the Ming Dynasty, knew the taste of life and loved tea as much as his life. He wrote Tea Sparse. In their spare time, friends who are integrated with Taoism go to Longjing, a famous tea-producing city. Once, he lived in a monk's house for more than ten days, but did nothing. Every day, he only loves to make Longjing tea and has a good time. When he left, he reluctantly said, "I really want a monk in Longkou who can accompany me to drink tea every day." Longjing, formerly known as Longhong, is located at the southern foot of Fengling near Hangzhou, with many clear springs. The folk song Longjing before the rain is very fragrant. Longjing before Rain was created before the solar term "Grain Rain". Usually, before Grain Rain, it was time for tea trees to "shoot a leaf", commonly known as "one flag and one cannon", which was used to make Longjing tea. As Hu Jiao said in a poem, "chalcedony is the freshest spring tea before it is cooked in Grain Rain in the morning." However, after Grain Rain, things got worse. Tea farmers in Longjing have a saying: "Picking three days early is a treasure, and picking three days late is a natural grass." Because it is related to the tenderness of tea.