Farms come in all shapes and sizes, but tiny urban/suburban farms are definitely on the rise:
On a field next to Potts, Adisson Toussaint, a 2004 immigrant from Haiti, was carefully weeding rows of cucumbers and summer squash. He has been growing vegetables on his half-acre plot for three years and selling his produce at a weekly farmers market in nearby Lowell.
Although he farmed in Haiti, Toussaint took classes sponsored by a Tufts University agriculture program to sharpen his understanding of marketing, land use, and business practices.
This video shows the ultimate urban farm, producing 3 tons of food per year from 6,000 square feet of raised-bed gardens:
This guy has hundreds of videos on growing food in your backyard: