All of the members of the Brassica family that we grow for food (cabbage, kale, kohl rabbi, broccoli and broccolini, cauliflower) are closely related and have developed over time as humans have selected plants for their edible leaves, stem or flower.   Here is the full story!

https://www.vox.com/xpress/2014/8/6/5974989/kale-cauliflower-cabbage-broccoli-same-plant

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