Also known as soil skohlrabi, eggplant lily, bulb kale, rugby, and also known as big head cabbage in Guangdong area, it is a biennial herb of Cruciferae family. According to the bulb skin color green, green and white, purple three types. According to the length of the growing period can be divided into three types of early, medium and late maturity. Early-maturing varieties of short plants, leaves less and small, 50-60 days after planting harvest, representative varieties are Beijing early white, Tianjin small tassel. Medium and late-maturing varieties of strong plant growth, leaves and large, planting to harvest takes 80-100 days. Representative varieties are stupid skunk cabbage, Datong pine root, Yunnan long breaking blue.