"When I came to Detroit, if you threw a stone up in the air it would hit an autoworker on its way down. A few years after that, if you threw a stone in the air it'd hit an abandoned house or a vacant lot on its way down. And most people saw those vacant lots as blight. But meanwhile during World War II, blacks had moved from the South to the North. And they saw these vacant lots as places where you could grow food for the community. And so urban agriculture was born."