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WELLESLEY, MA-- Ben Bois, of Green City Growers, left, holds a kale leaf as Harvard Pilgrim Health Care employees (from left, Kate Keeler, Risa Shames, Stephanie Oddleifson and Jamesie Gifford) inspect it for aphids. Green City Growers has set up raised garden plots in which employees grow kale, beets, carrots and other vegetables. CREDIT: JODI HILTON FOR THE NEW YORK TIMES