Also known as eggplant lily, bulb kale, for the cruciferous family of biennial herbs. 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.