My most successful crop this summer is the butternut squash I’ve been growing out of a pot on my patio. The concrete it is spreading over needs no tiresome weeding and the bugs have left it alone. It does need about a gallon of water a day and some occasional fertilizer (organic) as well. I should mention that it is under a sunshade sail most of the day so the squash doesn't cook itself on the vine.
The proof of the pudding is in the eating, as they say, but if this works there might be some more urban farming in my future.