Mustard is an annual or biennial herb in Cruciferae, and it is a famous specialty vegetable in China. Originated in China, it is a common vegetable cultivated all over the country, mostly distributed in the provinces south of the Yangtze River. The main lateral roots of mustard are distributed in the soil layer of about 30 cm, and the stems are short-cut. Leaves are attached to short stems, which are oval, oval, inverted oval and needle-shaped, and the leaves are green, dark green, light green, yellow-green, green stripes or purple. It is rarely cultivated in Europe and America and originated in Asia. Li Shizhen's Compendium of Materia Medica recorded the medicinal value of medical mustard. Mustard likes cold and wet, avoids heat and drought, and is slightly frost-resistant. The ten-day average temperature suitable for seed germination is 25℃. The ten-day average temperature suitable for leaf growth is 65438 05℃, and the temperature suitable for edible organ growth is 8 ~ 65438 05℃. However, the formation of edible organs in stem mustard and cabbage mustard requires low temperature, and the temperature requirements for leaf mustard are not strict.