Lettuce crops are irrigated in Yuma, Ariz. In winter, Yuma typically supplies many of those bags of baby spinach and mixed greens Americans consume. It's But unusually damp conditions have forced growers to end the season earlier than usual this year. Matt Meadows/Getty Images hide caption

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Matt Meadows/Getty Images

Vegetables were rationed at supermarkets in the U.K. due to poor weather conditions in Europe. Here, lettuce, broccoli and zucchini were rationed at a Tesco store in London. Victoria Jones/PA Images via Getty Images hide caption

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Victoria Jones/PA Images via Getty Images

A Caesar salad kit. Americans buy twice as many packages of bagged salad greens as heads of lettuce these days. Is the bagged stuff just as good? If it gets you to eat more leafy greens, yes. Morgan McCloy/NPR hide caption

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Morgan McCloy/NPR

As Bagged Salad Kits Boom, Americans Eat More Greens

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Dole has voluntarily withdrawn from the market all of its Dole-branded and private label packaged salads processed at a Springfield, Ohio plant because the plant has been linked to a Listeria outbreak. iStockphoto hide caption

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iStockphoto

Julia Sherman is the mastermind behind the Salad Garden at the Getty. Here, she pulls up heirloom greens for the salad. Abbie Fentress Swanson for NPR hide caption

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Abbie Fentress Swanson for NPR

Kandinsky's Painting No. 201, on the left, was the inspiration for the salad on the right, which was used to test diners' appreciation of the dish. Museum of Modern Art; Crossmodal Research Laboratory hide caption

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Museum of Modern Art; Crossmodal Research Laboratory