Did you know that keeping greens in an old pillow case extends their life? Or that you can ripen up a hard avocado by nestling it in with some bananas? Any time we visit the co-op and our eyes have been bigger than our crisper drawer, we've always wondered how to best store our loot so that we don't end up with arugula that looks like it took a dip in the Gowanus. Here's an excellent article from Vegetarian Times that demystifies why some veggies last longer than others and lets you know how to keep your fruits fresh for as long as possible: Spoiled Rotten- How to best store Fruits and Vegetables

Perhaps you do it once a week. Perhaps only when you trace those sulfurous odors to your refrigerator’s crisper drawers. But eventually, you toss out spoiled fruits and vegetables. Lots of them. Researchers at the University of Arizona recently spent a year tracking families’ food-use habits. Working with the United States Department of Agriculture, they interviewed the families about their eating habits, collected their grocery receipts, watched them prepare meals, and then sifted through every last discarded lettuce leaf, slice of bread, burger and bean.

The results, reported in 2002, were pretty shocking. The families tossed out an average of 470 pounds of food per year——about 14 percent of all food brought into the home——at an annual cost of $600. Every day, they discarded more than half a pound of fruits and veggies. In total, Americans chuck a fourth of all the produce they buy, mostly because it’s gone bad, says Timothy Jones, PhD, contemporary archaeologist at the University of Arizona. Nationally, we dump $43 billion worth of food every year.

Wasting produce is, well, a waste—bad for our wallets and bad for the environment. Plus, who wants to make a salad when confronted with a bin of rotting sludge? All this led us to ask: How can we keep produce fresh longer?

If your produce rots after just a few days, you might be storing incompatible fruits and veggies together. Those that give off high levels of ethylene gas——a ripening agent——will speed the decay of ethylene-sensitive foods. Keep the two separate. Use trapped ethylene to your advantage: To speed-ripen a peach, put it in a closed paper bag with a ripe banana. One bad apple really can spoil the whole bunch. Mold proliferates rapidly and contaminates everything nearby, so toss any spoiled produce immediately. For longer life, keep your produce whole——don’t even rip the stem out of an apple until you eat it. “As soon as you start pulling fruits and vegetables apart,” says Barry Swanson, a food scientist at Washington State University, “you’ve broken cells, and microorganisms start to grow.”

Cold-sensitive fruits and veggies lose flavor and moisture at low temperatures. Store them on the counter, not in the fridge. Once they’re fully ripe, you can refrigerate them to help them last, but for best flavor, return them to room temp. Never refrigerate potatoes, onions, winter squash or garlic. Keep them in a cool, dark, dry cabinet, and they can last up to a month or more. But separate them so their flavors and smells don’t migrate.

The ABCs of Fresh

“The main way to lengthen shelf life is by using cold temperatures to slow food’s respiration, or 'breathing' process,” explains Marita Cantwell, PhD, a postharvest specialist at the University of California, Davis. In general, the warmer the temperature, the faster the rate of respiration, which is why refrigeration is critical for most produce. But while you want to slow it down, you don’t want to stop the breathing altogether. “The worst thing to do is seal fruits and vegetables in an airtight bag,” says Barry Swanson, a food scientist at Washington State University. “You’ll suffocate them and speed up decay.”

Some fruits emit ethylene, an odorless, colorless gas that speeds ripening and can lead to the premature decay of nearby ethylene-sensitive vegetables. Put spinach or kale in the same bin as peaches or apples, and the greens will turn yellow and limp in just a couple of days. So the first trick is to separate produce that emits ethylene from produce that’s sensitive to it.

REFRIGERATE THESE GAS RELEASERS:

• Apples • Apricots • Canteloupe • Figs • Honeydew

DON’T REFRIGERATE THESE GAS RELEASERS:

• Avocados • Bananas, unripe • Nectarines • Peaches • Pears • Plums • Tomatoes

KEEP THESE AWAY FROM ALL GAS RELEASERS:

• Bananas, ripe • Broccoli • Brussels sprouts • Cabbage • Carrots • Cauliflower • Cucumbers • Eggplant • Lettuce and other leafy greens • Parsley • Peas • Peppers • Squash • Sweet potatoes • Watermelon

At least as important as how you store produce is when you buy it. Do all your other shopping first so that your berries and broccoli don’t get warm——and respire rapidly——while you’re picking up nonperishable items. Get the produce home and into the fridge as soon as possible.

Even under optimal conditions, fragile raspberries will never last as long as thick-skinned oranges. Eat more perishable items first. And if you still find yourself with a bushel of ripe produce——and a business trip around the bend——improvise. Make a fruit pie, a potful of soup or a great big vat of tomato sauce, and throw it in the freezer. You’ll relish your foresight when you get home.

Image by DC Central Kitchen