You can grow vegetables anywhere
Here's a picture of Red Giant Mustard growing in a crack between the concrete garage floor and the asphalt driveway. I must have dropped some seeds there when carrying the mustard plants into the garage this fall to dry.
This picture was takens after at least four frosts, and 4 inches of snowfall that melted the next day.
Closer up view:
If mustard will grow in a narrow crack with lousy clay soil under the concrete and asphalt, it will grow just about anywhere.
What other plants will grow in extremely unfavorable conditions?