Thu, 2009/11/12 - 1:33pm
This is cool.
A guy is gardening the side of a building in London with felt mat and drip irrigation.
At mid lattitudes, the sides of buildings get nearly as much sun as the flats. In summer. A south facing wall gets more sun than the ground in winter. I'm picturing something like a lettuce flag hanging off my balconies in spring. 
