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. Cabbage heads generally range from 0.5 to 4 kilograms (1 to 9 lb), and can be green, purple or white. Smooth-leafed, firm-headed green cabbages are the most common.

Cabbage is generally grown for its densely leaved heads, produced during the first year of its biennial cycle. Plants perform best when grown in well-drained soil in a location that receives full sun.

Cabbage is a rich source of vitamin C and vitamin K, containing 44% and 72%, respectively, of the Daily Value (DV) per 100-gram amount. Cabbage is also a moderate source (10–19% DV) of vitamin B6 and folate, with no other nutrients having significant content per 100-gram serving.