Mustard (Brassica juncea) is an annual or biennial herbaceous plant of the genus Brassica in the Cruciferae family. It is a famous specialty vegetable in China. It is native to China and is a commonly used vegetable cultivated throughout the country. It is mostly distributed in Provinces south of the Yangtze River. The main lateral roots of mustard are distributed in a soil layer of about 30 cm. The stems are shortened stems, and the leaves are attached to the shortened stems. They have shapes such as ellipse, oval, obovate, and lanceolate. The leaves are green, dark green, light, etc. Green, yellow-green, green interspersed or purple-red. It is rarely cultivated in European and American countries and originated in Asia. Li Shizhen's "Compendium of Materia Medica" records the medical value of medical mustard. Mustard prefers cold and moist conditions, avoids heat and drought, and is slightly tolerant of frost. The average temperature suitable for seed germination is 25°C. The average temperature most suitable for the growth of leaves of mustard is 15°C, and the most suitable temperature for the growth of edible organs is 8 to 15°C. However, the formation of edible organs of stem mustard and bag mustard requires lower temperatures. Generally, leaf mustard is not suitable for the growth of edible organs. Temperature requirements are less stringent.