In 1953, Qimen Tea Factory established a classification standard for fresh leaves, which defined the grading based on the age and tenderness of fresh leaves and the proportion of buds and leaves. Qihong fresh leaves were classified into special grade, grade 1 to grade 5. Fresh leaves are classified according to standards, which is the first of its kind in China. The standards have been included in the textbook "Tea Making" for higher agricultural colleges and universities across the country. After grading, fresh leaves achieve uniformity and consistency, laying the foundation for grading Qihong finished tea.
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.
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