Cherry tomato plants tower over Lauren Rathmell’s head in the latest greenhouse built by the company she co-founded, called Lufa.
"We train everything vertically, so that we can keep these plants a lot longer than a typical garden tomato plant," she explains. "We're in the probably 15 to 20-foot-long plant range now. They're really high."
Their height makes it hard to tell that the greenhouse encloses a space the size of three football fields — all dedicated to growing varieties of tomatoes and eggplants.
It’s also four stories off the ground, on the roof of a former Sears warehouse not far from Montreal’s Trudeau International Airport.