The lotus leaf is the leaf of the Nymphaea plant lotus. The lotus is a perennial aquatic herb, born in water, pond, lake or paddy field, wild or cultivated. Widely distributed throughout the north and south. From June to July, the flowers are harvested when they are not open, the petioles are removed, and they are dried until 70% to 80% dry, folded in half into a semicircle, and dried. Fresh leaves or young leaves are also used in summer.