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Fast-growing leafy green plants, such as chard, are ideal candidates for vertical farming. "At this point, I'm not recommending production of grains in vertical farms, because grains need really large land areas," Joel Cuello says. "They're more energy in (Photo: Bob Demers/UA News) Fast-growing leafy green plants, such as chard, are ideal candidates for vertical farming. "At this point, I'm not recommending production of grains in vertical farms, because grains need really large land areas," Joel Cuello says. "They're more energy intensive."