Kale, Brassica oleracea variant acephala, is a leafy herbaceous biennial or perennial plant in the family Brassicaeae grown as a leafy green vegetable. The kale plant is a non-heading, cabbage like plant with curly or straight, loose blue-green or purple leaves. Kale is usually grown as as an annual plant, harvested after one growing season and can reach a height of 1 m (3.3 ft).