A celebrity in the lettuce world, kale is a prodigy of flavor, nutrition, gorgeous color, and texture. Growing to 3′ across, heirloom Portuguese variety produces tender, especially large, flat, deep blue-green leaves with white stems and ribs. Kales sweet, rich flavor sparks up salads, stir fries, soups, and pesto. Provides a continuous bounty: as outer leaves are harvested, new leaves emerge from the center.