Oh how I would like to be able to do this as well! We don't know much about wild plants though, I've always lived in the city. Dunno bout the countryfolks. It would probably be cool to just go out in to the woods and come back home with a basket of nutritious greens for the family.
It definitely is a skill worth having. With all these talks about global instability and war, this could make the difference in survival in the event of a collapse. Now that I've thought about it, I should really brush up on edibles and maybe go places and start scattering seeds like crazy.
Such plants will very much help to survive in case of collapse, but it is necessary to understand which of them are edible, and which are poisonous.