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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Tomatoes from Canada, Mexico and Florida Morgan McCloy/NPR hide caption

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The Search For Tastier Supermarket Tomatoes: A Tale In 3 Acts

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Researchers at Cold Spring Harbor Laboratory say their new genetic toolkit to improve tomato yield without compromising flavor can be used in all varieties, from plum to cherry. Courtesy of Zach Lippman/Cold Spring Harbor Laboratory hide caption

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Ammunition in the form of tomatoes are thrown to a crowd gathered for the annual Tomatina Festival in Bunol, Spain, near Valencia, Wednesday. AFP/AFP/Getty Images hide caption

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A Cherokee purple tomato grown in Alaska in 2011. Sherry Shiesl/Tatiana's TOMATObase 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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A worker separates tomatoes at a market in Mexico City. The Commerce Department says it might act to end a 16-year-old trade deal governing fresh Mexican tomatoes sold in the U.S. Gregory Bull/AP hide caption

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Notice how some of these tomatoes have unripe-looking tops? Those "green shoulders" are actually the keys to flavor. pocius/Flickr.com hide caption

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How The Taste Of Tomatoes Went Bad (And Kept On Going)

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A tomato expert recommends planting seedlings in rich soil with lots of organic matter and a steady slow-release fertilizer. iStockphoto.com hide caption

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