Cabbage or headed cabbage (comprising several cultivars of Brassica oleracea) is a leafy green or purple 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 is closely related to broccoli and cauliflower (var. botrytis), Brussels sprouts (var. gemmifera) and savoy cabbage (var. sabauda) which are sometimes called cole crops. Cabbage heads generally range from 0.5 to 4 kilograms (1 to 9 lb), and can be green, purple and white.