Cabbage

Cabbage crop guide – get the most of your cabbage fertilizer

Cabbage or headed cabbage (comprising several cultivars of Brassica oleracea) is a leafy green, red (purple), or white (pale green) biennial plant grown as an annual vegetable crop for its dense-leaved heads. 

It is descended from the wild cabbage, B. oleracea var. oleracea, and belongs to the "cole crops", meaning it is closely related to broccoli and cauliflower (var. botrytis); Brussels sprouts (var. gemmifera); and savoy cabbage (var. sabauda). Brassica rapa is commonly named Chinese, celery or napa cabbage and has many of the same uses.
Source: Wikipedia