Baby kale can be the immature leaves of any of the many varieties of kale. While most kale is harvested at about 60 days, baby kale is plucked at around 30 days.
It’s said to be a sweeter variety of kale that’s mild enough to be added to salads without massaging. The leaves hold their shape and impart a mild flavor when added to stir-fries.
Not as common in the U.S., Brazilian kale has delicious, broad, flat, dark green leaves with rounded corners. It is high in fiber, iron, copper, and vitamins C and A.
It’s quite popular in South America, where it’s used in various dishes, including Portuguese soups like caldo verde and feijoada completa. It’s also a fine choice for kale lasagna.
Often called Gai Lan or Chinese Broccoli, Chinese kale is way smaller than most kale types, and though much fewer than an average broccoli plant, it does sport florets.
Curly kale — which comes in plenty of sub-varieties, including Redbor, Darkibor, Winterbor, Scarlet, and Blue Curled Scotch — has slightly curled, dark green leaves.