Benefit to Rahm’s contractor friends: Contracts to import “good” soil, erect 16 foot high fences around the plots to keep the Neanderthals out, security, lighting, transportation of food out to markets, agricultural inspectors, watering systems, etc., etc.
Benefit to Rahm in votes: priceless.
I have lost several hundred tomatoes and zuccini (what's plural of zuccini?) to mocking birds, rats, mice, and coons. I have trapped and killed over 17 rats, and all that does is let the smaller ones move into the deceased rats digs. I've put out rat poison, which has not worked much even though they eat it all. I've trapped and "relocated" the mocking birds, only to have new ones immediately backfill the territory.
Urban gardening is a nightmare if you want any produce!
Gardens are a visible “see, we did something about high food prices” answer.
The problem is where they will get the workers, since most people on food stamps are not willing to work or working under the table.