In 2008, a group of friends in a small Yorkshire town decided to start planting food in unused public spaces.
The town is Todmorden, population about 15,000, tucked into a valley between Burnley and Halifax. The group is Incredible Edible Todmorden. Their motto is "if you eat, you're in."
Today the railway station beds grow herbs. The fire station is surrounded by fruit trees. The canal towpath is lined with edible plantings. The forecourt of the local police station has been transformed into what's now called "possibly the finest and greenest looking police station in the UK," with a small library of crime novels installed for good measure. Everything is free to harvest.
They have no paid staff, no buildings, and no public funding. They've operated this way for almost two decades. Their guiding principles: "believe in the power of small actions," "kindness underpins everything we do," and "it's sometimes better to ask for forgiveness, not permission."
Over the years they've added a Tool Library, a Makery, and little free libraries scattered around town. They host visitors from around the world (they call it "vegetable tourism"). Their gardening Sundays have grown from four or five people to forty or fifty.
The model has been replicated in over 700 projects worldwide and continued to spread.