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Collards and kale are both members of the Brassicaceae family, also known as the cabbage family, which includes other cool-season cole crops like cabbage, broccoli, Brussels sprouts, cauliflower and radish. However, collards and kale are distinct from much of the cabbage family because they do not form heads; instead their leaves are harvested.
Frelier, Johannah; Cummins, Denyse; and Motsenbocker, Carl, "Sustainable Gardening for School and Home Gardens: Leafy Greens" (2021). Sustainable Gardening for School and Home Gardens. 3.