Potamogeton kohlrabi, also known as Bulb Cabbage, is commonly known as Bulb Cabbage, Yumanqing, Tianjin Bulb, and Northeast Bulb. Its edible part is fleshy bulb, which is crisp and tender and can be eaten fresh and pickled. Kohlrabi is a variety of cabbage that can form fleshy stems. Compared with cabbage, kohlrabi is eaten as the fleshy stems. Now it is cultivated all over China. Bulb cabbage seedlings of a certain size are vernalized at 0- 10℃, and then bolting, flowering and fruiting under long sunshine and suitable temperature. The flower organ structure and flowering and pollination habits are the same as those of cabbage. In the north, people usually eat it by pickling, and it can also be served as a stir-fry dish. It is one of the favorite foods of the people in the north, because taro can be stored for a long time in cold winter and tastes delicious. The picture is as follows: