There are about 30 species of Mentha plants in the world. Mint contains 25 species, except for a few annual plants, most of which are fragrant perennial plants. At present, the main producing area is the United States, and the best mint is produced in Britain. The stem is about 90 cm long, the hairy leaves are serrated, the flowers are terminal, and there are purple, white and pink spikes. There are 12 species in China, and there are pepper lotus, mint, spearmint and mint in the wild. Peppermint Wang Yun Photographed at the southern foot of Qinling Mountains in Shaanxi Province Peppermint: The flower spike is purple and the plant height is 30-90cm. Apple mint: the whole plant is covered with fluff, with round leaves and apple fragrance, hence the name, with a plant height of 60-90 cm. Spearmint: The flower spike is white, with faint fragrance and obvious veins. Plant height is 60- 100 cm. Plutarch mint: the flower spike is pink, sensitive to cold, and the plant height is 10-40 cm. Pear mint: There are pink-green spots on the leaves, which are often used as ornamental because of their beauty. Plant height 10-50 cm. Lemon perfume mint: also known as fragrant bee flower, the plant height is about 50-80 cm. It is a perennial herb, very cold-resistant and easy to grow. Flowers and leaves are used to make tea, which has the functions of relaxing mood, helping sleep and promoting digestion.