At the northern outskirts of Milwaukee, in a neighborhood of boxy post-WWII homes near the sprawling Park Lawn housing project, stand 14 greenhouses arrayed on two acres of land. This is Growing Power, the only land within the Milwaukee city limits zoned as farmland…
…Since 1993, Allen has focused on developing Growing Power’s urban agriculture project, which grows vegetables and fruit in its greenhouses, raises goats, ducks, bees, turkeys, and—in an aquaponics system designed by Allen—tilapia and Great Lakes Perch—altogether, 159 varieties of food.
Growing Power also has a 40-acre rural farm in Merton, 45 minutes outside Milwaukee, with five acres devoted to intensive vegetable growing and the balance used for sustainably grown hays, grasses, and legumes which provide food for the urban farm’s livestock.
Allen has taken the knowledge he gained growing up on the farm and supplemented it with the latest in sustainable techniques and his own experimentation.
Growing Power composts more than 6 million pounds of food waste a year, including the farm’s own waste, material from local food distributors, spent grain from a local brewery, and the grounds from a local coffee shop. Allen counts as part of his livestock the red wiggler worms that turn that waste into “Milwaukee Black Gold” worm castings.
Allen seems to take a particular delight in thrusting his steam-shovel-sized hands into a rich mixture of soil and worms in Growing Power’s greenhouses. “You can’t grow anything without good soil,” he preaches to a group touring the project.
Allen designed an aquaponics system, built for just $3,000, a fraction of the $50,000 cost of a commercially-built system. In addition to tilapia, a common fish in aquaculture, Allen also grows yellow perch, a fish once a staple of the Milwaukee diet. Pollution and overfishing killed the Lake Michigan perch fishery; Growing Power will soon make this local favorite available again. The fish are raised in 10,000-gallon tanks where 10,000 fingerlings grow to market size in as little as nine months.
But the fish are only one product of Allen’s aquaponics system. The water from the fish tanks flows into a gravel bed, where the waste breaks down to produce nitrogen in a form plants can use. The gravel bed supports a crop of watercress, which further filters the water. The nutrient-rich water is then pumped to overhead beds to feed crops of tomatoes and salad greens…
Full article here.
Growing Power website here.