Ornamental kale plants can make a wonderful red, pink, purple, or white show in the cool season garden, with very minimal care. Ornamental kale plants were developed for their spectacular colors and are not edible. Although they are sometimes called flowering kale, the plants rarely put out real flowers. The colour is all in their extravagantly ruffled and feathered leaves. Ornamental kale plants are best used as an annual in beds and containers.