Guyu is the sixth solar term of the twenty-four solar terms and the last solar term of spring. It is called Guyu when the sun reaches 30 ° of the ecliptic meridian from April 19th to 21st every year, which originates from the ancient saying "Rain produces a hundred grains". Every year before and after the Grain Rain, the tea leaves and buds tend to be tender, and Qi Hong's fresh leaves are picked at this time.

In the old days, new tea trees usually took 4 years to be harvested, and only spring tea was harvested in the first year, leaving more young branches to nourish the tree. Due to the lack of a unified grading standard for traditional Qihong tea products, they are picked without distinction of size, with varying degrees of age and tenderness. The picking method is usually to wait for the tea buds to grow, pick once, and finally harvest the plant. Harvesting twice a year, from the Grain Rain to the edge of the Beginning of Summer, it is called the Head Tea (Spring Tea). Twenty days later, the Seed Tea (Summer Tea) is harvested, and the Three Water Tea (Autumn Tea) is not harvested. There is a saying in agriculture that goes, 'Sell children and women, do not harvest the Three Water Tea'.

In October 1934, the Qimen Tea Industry Improvement Station successfully trial produced autumn tea, marking the beginning of harvesting autumn tea for Qihong. After the establishment of the People's Republic of China, fresh leaf picking was taken as a prerequisite to ensure the quality of Qihong, and the picking method was emphasized, advocating the picking method of picking large leaves and leaving small ones, and leaving fish leaves for top seedlings.