For another example of a plant that just didn't make it into modern society at scale, there are skirrets. Carrots, parsnips, and skirrets were related umbellifer plants with edible, nutritious roots, cultivated over the centuries as food. Carrots and parsnips were responsive to breeding for root size, and could produce comparatively huge roots, but skirrets never really did. Once the potato was brought over from the new world, the skirret fell out of favor.