The scientific name of kohlrabi mustard (? Brassica juncea? ) is an annual or biennial herb of Cruciferae, a famous specialty vegetable in China. It originated in China and 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-shortened stems. The leaves are attached to the short-shortened stems, which have the shapes of ellipse, oval, inverted oval and needle-hanging, and the leaves are green, dark green, light green, yellow-green, green-striped or purple. It is rarely cultivated in Europe and America, and originated in Asia. Li Shizhen's Compendium of Materia Medica records the medical value of medical mustard. Mustard likes cold and wet, avoids heat and drought, and is slightly frost-resistant. The average temperature suitable for seed germination is 25℃. The most suitable average temperature for leaf growth of mustard is 15℃, and the most suitable temperature for edible organ growth is 8~ 15℃. However, the formation of edible organs of stem mustard and cabbage mustard requires lower temperature, and the temperature requirements for leaf mustard are not strict.

Cabbage (Brassica oleracea? L) is an annual or biennial herb of Brassica in Cruciferae, and it is one of our important vegetables. Except for Chinese kale, which originated in China, all varieties of cabbage originated from the Mediterranean Sea to the North Sea coast. As early as 4000~4500 years ago, ancient Rome and ancient Greeks cultivated it.