Here is an excerpt from an article on the subject:
"There are more visionaries in Detroit than in most Rust-Belt cities, and thus more visions of a community rising from the ashes of a moribund industry to become, if not an urban paradise, something close to it. The most intriguing visionaries in Detroit, at least the ones who drew me to the city, were those who imagine growing food among the ruins—chard and tomatoes on vacant lots (there are over 103,000 in the city, sixty thousand owned by the city), orchards on former school grounds, mushrooms in open basements, fish in abandoned factories, hydroponics in bankrupt department stores, livestock grazing on former golf courses, high-rise farms in old hotels, vermiculture, permaculture, hydroponics, aquaponics, waving wheat where cars were once test-driven, and winter greens sprouting inside the frames of single-story bungalows stripped of their skin and re-sided with Plexiglas—a homemade greenhouse. Those are just a few of the agricultural technologies envisioned for the urban prairie Detroit has become."
"Although Detroiters have been growing produce in the city since its days as an eighteenth-century French trading outpost, urban farming was given a major boost in the nineteen eighties by a network of African-American elders calling themselves the “Gardening Angels.” As migrants from the rural South, where many had worked as small farmers and field hands, they brought agrarian skills to vacant lots and abandoned industrial sites of the city, and set out to reconnect their descendants, children of asphalt, to the Earth, and teach them that useful work doesn’t necessarily mean getting a job in a factory.Thirty years later, Detroit has an eclectic mix of agricultural systems, ranging from three-foot window boxes growing a few heads of lettuce to a large-scale farm run by The Catherine Ferguson Academy, a home and school for pregnant girls that not only produces a wide variety of fruits and vegetables, but also raises chickens, geese, ducks, bees, rabbits, and milk goats. Across town, Capuchin Brother Rick Samyn manages a garden that not only provides fresh fruits and vegetables to city soup kitchens, but also education to neighborhood children. There are about eighty smaller community gardens scattered about the city, more and more of them raising farm animals alongside the veggies. At the moment, domestic livestock is forbidden in the city, as are beehives. But the ordinance against them is generally ignored and the mayor’s office assures me that repeal of the bans are imminent."