Like many fresh, leafy vegetables, lettuce is highly perishable, particularly if it isn't refrigerated shortly after purchase. Packaged lettuce boasts a much longer shelf life than unpackaged lettuce-- longer than many believed possible just a few years ago. However, the same rules for storage and handling apply to both packaged and unpackaged formats, and it’s important to follow these rules.
Lettuce Shelf Life
Lettuce1 week
Boyer, Renee, and Julie McKinney. "Food Storage Guidelines for Consumers." Virginia Cooperative Extension (2009): n. pag. Web. 7 Dec 2009.

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