This variety is more cold-hardy than traditional Siberian Kale and performs well even after a light frost. Improved Siberian kale is a cool season brassica that has large, blue-green oak-type leaves with white stems and a ruffled shape. Leaves grow to 24 inches. Its superior tenderness makes it one of the best varieties for raw salads. Mature leaves are suitable in soups, quiches, stir fry, steamed or sauteed. It's high in protein and highly digestible. One of the best forage producers in the brassica family, it can produce up to 8 tons of leafy forage per acre! In the Northern states it is used as a summer, fall, and winter forage. Kale is a highly preferred food for deer and carries up to 30 percent protein!