I'm looking for info about urban gardening.
Ian from the Bricolabs list sent this beautiful example to me:

Agnes Deans - Wheatfield – A Confrontation, 1982. She planted and harvested two
acres of wheat in Battery Park landfill, Manhattan

http://www.guardian.co.uk/artanddesign/gallery/2009/jun/18/radical-nature-exhibition-barbican?picture=349064137