The competition's growing fiercer. MightyVine, also in Rochelle, is building a second greenhouse that will double its operation after booming sales and rave reviews of its tomatoes from some of Chicago's top chefs this past winter. Gotham Greens, a New York-based hydroponic grower of leafy greens with a greenhouse in the Pullman neighborhood, recently expanded into Jewel-Osco stores, adding to its rapidly growing presence in Chicago-area markets.