Kale, romaine lettuce, beet leaves and pea shoots are flourishing in central Saskatchewan in the dead of winter at Campbell Greenhouses. A unique aquaponic greenhouse is turning out nutritious, leafy greens without the use of soil. “We say it’s a greenhouse, but it looks nothing like a traditional greenhouse,” part owner Neil Erickson explains. Erickson and Mary Campbell are the brains behind the beast. “Everybody asks me how many employees we have,” says Campbell. “I say ‘oh, over 200 ’cause these are our little employees,’” she says, motioning toward a massive tank of fish. “They’re doing all of the work for us.” The aquaponic cycle begins with koi and talapia fish and keeping them well-fed. “What happens is, they poop and then our fish waste product goes through a series of biological filters,” explains Campbell. Bacteria cultures convert the waste to nitrates then the gravity-fed system distributes it as fertilizer to bunks of growing beds waiting below.