Count kale as one of the true treasures of the fall garden, with its sweetness revealed only after old Jack Frost has kissed its leaves a time or two. This ultra-cold-hardy, leafy green vegetable is a reliable deeply satisfying addition to any cool-weather garden. Some types have tender leaves perfect for salads. Some are great steamed or in stews, and some are so hardy you can harvest them even in the dead of winter almost everywhere. And, they’re beautiful, too.