As the name suggests, Siberian kale is a cold-hardy kale variety from Northern Asia. Siberian Kale is a treat to grow--easy, productive, and beautiful--and its medium-frilly leaves are extremely versatile: equally useful in cases when you want soft and melting greens as when you want greens that have a little structure and toothsomeness. Best flavor after a frost.Siberian kale is one of the lesser known kales, though you might see it in abundance on supermarket shelves as a baby kale leaf used in salad mixes. While it makes a great addition to salads, you must leave it to grow to appreciate its full potential! The leaves are large, but tender, and only need a quick cooking to make them tender.