Brassicas That Come From The Same Plant: Broccoli, Cauliflower, Brussels Sprouts, Cabbage, Collard Greens, Kale, Kohlrabi
You may have heard that corn was transformed by the farmers of southern Mexico from a grass-like plant into the hearty and substantial grain that it is today, but it has nothing on the Brassica oleracea plant. Ancient farmers bred half a dozen of the leafy greens we depend on to keep our doctors off our backs today by tinkering with this one common European plant.
Thousands of years ago, different farmers in different regions selectively bred Brassica oleracea, which is actually a type of wild mustard that grows around the northern Mediterranean area, in different ways. Some selected for different kinds of leaves to create what we call kale, Chinese broccoli, and collard greens. Others focused their genetic modifications on the plant's terminal buds to produce cabbage, florets to produce cauliflower and broccoli, or stems to produce kohlrabi. Even just by tweaking the axillary buds, Brussels sprouts were born. These plants may look vastly different from each other, but they're so closely related that they can mate with each other. In humans, that's usually a bad thing, but on a species level, too much difference usually means infertile offspring.