What month does Huai Yue refer to?

April is long summer, including Long Summer and Xiaoman. In astronomy, "long summer" means that spring is about to say goodbye and summer begins immediately; "Twenty-four solar terms" Day: "In mid-April, people are small and full, and things are small and full." "Xiaoman" means that the plants in nature are lush and full, and the seeds of summer crops are gradually full. Around the long summer, it is the busy season of planting early rice and picking tea in the north and south of the Yangtze River. There are some agricultural proverbs, such as "A variety of plants grow in summer and reap Man Cang millet" and "Grain Rain seldom picks them, and they never stop picking them in summer".