Dark leafy greens like kale are particularly rich in vitamins A, C and K. Kale also provides folate, which is an important nutrient for women of child-bearing age. Greens of all sorts are showing up in produce departments and in home kitchens and the buzz about recipes for kale "chips" has been off the charts this year. Common types of kale in the markets these days include curly, lacinato (dinosaur) and purple Russian.