Knotty kale (Brassica oleracea L. var. capitata L.) is a plant of the Cruciferae family, genus Brassica, and a variety of kale (Brassica oleracea L.). Also known as cabbage, cabbage, pimple white, cabbage, cabbage, cabbage, cabbage, lotus white and so on. A biennial herb, powdery-frosted. Dwarf and stout annual stems fleshy, unbranched, green or gray-green. Basal leaves most, thick, layers wrapped into a globular body, oblate, 10-30 cm in diameter or larger, creamy white or light green; originated in the Mediterranean coast, 16th rafts and denigrate the ancient rubbing Shanzhuo period began to be introduced to China. Kale with the cold, disease resistance, adaptability, easy to store and transport, high yield, good quality and other characteristics, commonly cultivated throughout China, is China's northeast, northwest, north China and other regions of the spring, summer, fall, one of the main vegetables. Kale is a biennial herb, the root system is mainly distributed in the soil layer within 30cm. The stems are short and divided into inner and outer short stems, with the outer short stems bearing rosette leaves and the inner short stems bearing bulbous leaves. The leaves of kale include cotyledons, basal leaves, seedling leaves, rosette leaves, and bulbous leaves, which are dark green to green, with smooth leaf surfaces, plump leaf flesh, and powdery wax on the leaf surfaces, which reduces water transpiration, and thus makes kale more drought-resistant than Chinese cabbage. Flowers are in racemes, cross-pollinated, and all varieties and species of kale hybridize with each other. The fruit is a long horned fruit, the seeds are rounded, reddish brown or blackish brown, thousand grains weight about 4g.