Inside one of Mastronardi Produce Sunset Grown's greenhouses, tomato vines hang on lines that can be adjusted so that the tomatoes are always at a height that's convenient for harvesting. Dan Charles/NPR hide caption

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How Canada Became A Greenhouse Superpower

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Russ Finch holds up half of a Cara Cara orange grown in his geothermal greenhouse in Alliance, Neb. Courtesy of Grant Gerlock/Harvest Public Media hide caption

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Paul Lightfoot, CEO of BrightFarms, in his company's greenhouse in Lower Makefield Township, Pa. Dan Charles/NPR hide caption

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Vegetables Under Glass: Greenhouses Could Bring Us Better Winter Produce

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This "pinkhouse" at Caliber Biotherapeutics in Bryan, Texas, grows 2.2 million plants under the glow of blue and red LEDs. Courtesy of Caliber Therapeutics hide caption

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The taste of Mock's tomatoes starts with the seed. He uses only organic varieties, including cherry and several heirloom varieties. Allison Aubrey/NPR hide caption

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Tastier Winter Tomatoes, Thanks To A Boom In Greenhouse Growing

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