Some people started in 2008, in UK, in the small city of Todmorden,
to grow vegetables everywhere in the city, and ask people to harvest
them for free. Great success. Four years later, many cities in the
world adopt this idea.
http://www.incredible-edible-todmorden.co.uk/
I recommand to see the film, at the bottom of the page.
International site:
http://www.incredible-edible.info/
JN