Add zest to your salads and stir-fries with Kale. The Dwarf Blue Scotch is valued for its nutritional content of vitamin A, ascorbic acid, and iron. Kale is an extremely hardy plant, often surviving freezes and producing fresh greens during winter months. When cold weather begins, mulch with straw for production well into winter. Kale produces in Spring but may be better grown for a fall crop, because frost improves the flavor by taking out some of the bitterness. Matures in 65 days.