The Mountain and the Tree

I'm not sure about that. There were previously a lot more traditional vegetables people used to eat a lot more of (things like winter greens, good king henry, etc, and people would leave root veg in the ground to pull later) - those have fallen out of fashion with an increased diversity of products from abroad, and I expect many varieties no longer exist now. I suspect there would be food if we grow it, but it would simply not be as desirable as the tasty foods we've become used to.