Like broccoli, cauliflower, and collards, kale is a descendant of the wild cabbage, a plant thought to have originated in Asia Minor and to have been brought to Europe around 600 B.C. by groups of Celtic wanderers. Curly kale played an important role in early European food ways, having been a significant crop during ancient Roman times and a popular vegetable eaten by peasants in the Middle Ages. English settlers brought kale to the United States in the 17th century.
For more information about kale and it's nutritional value, go here.
Oh, hail you kale.