Minor adjustments to how we store fruits and vegetables could yield significant benefits for both the planet and our finances. From herbs that quickly wilt to berries that rapidly develop mold, much of what ends up in the trash is less about what we purchase and more about how it is kept at home. This spoilage is largely driven by moisture and temperature.
The Science of Spoilage
Scientifically, produce does not simply go bad; it breaks down under specific conditions. Plants, much like humans, host natural microflora, a diverse community of microscopic organisms. "This could be bacteria, yeast, molds, things like that," explained Amanda Deering, associate professor of produce food safety at Purdue University. Understanding these factors can help consumers take steps to prolong freshness.
Wait to Wash
Washing produce before storing it can leave water that bacteria, yeast, and mold need to grow. Experts recommend waiting to wash fruits and vegetables until just before eating, and keeping them as dry as possible in the fridge meanwhile. Adding a paper towel can absorb dampness in containers of berries or leafy greens. Food experts also warn that cutting up fruits and vegetables before storing them can reduce their shelf life.
"The big one is washing it and cutting it before storing it. This, of course, can leave a lot of excess moisture behind," said Abbey Sharp, registered dietitian. "It speeds up spoilage because you are cutting into those cell walls."
Keep Most Produce Cold and Give It Space
At room temperature, microscopic organisms grow faster. Keeping food in the fridge can slow that process, Deering said, but how you pack your fridge also matters. Overcrowding it can block airflow and make it harder to keep temperatures consistent. Different foods have different needs. Herbs last longer when treated like flowers, trimmed and placed in water, while harder herbs can be wrapped in a damp towel and stored in the fridge. Root vegetables like carrots can be kept in water to maintain crispiness. Separating leafy tops can extend the shelf life of carrots and beets.
Keep Some Kitchen Staples Apart
Where you store produce can affect both how it tastes and how it lasts. The texture and flavor of tomatoes, for example, are best preserved at room temperature, even if refrigeration can slow their spoilage, said Deering. Whole garlic should be kept in a cool ventilated space, while cut or peeled garlic belongs in the fridge. Potatoes and onions are best stored outside the fridge in a cool, dark, well-ventilated place, like a pantry or cabinet, but they should not be kept together.
"You want to keep them away from one another because they actually can make each other spoil faster," said Sharp. Mixing fruits at different stages of ripeness also can shorten shelf lives. As fruits ripen, they release ethylene gas, a natural compound that speeds up the ripening process in nearby produce. So storing very ripe bananas next to greener ones or alongside other fruits can cause everything around them to ripen and spoil more quickly, Deering said.
Know What Spoiled Actually Looks Like
Confusion about what is actually safe to eat also drives food waste. The FDA estimates that confusion over food labels accounts for about 20% of consumer food waste, as many people misinterpret the purchase-by dates as indicators of safety. Other food gets trashed when it does not look perfect, according to Sharp, who notes that "a little ugly is not the same as unsafe." When fruits and vegetables wilt, soften, or become slightly discolored, they may not taste as fresh in certain recipes, but that does not mean they are spoiled.
A limp carrot or a slightly soft celery stalk, for example, can still be safe to eat, especially when cooked, Sharp said. "Produce that is like a little bit wilted or like a little soft or a little less crisp is often more a quality issue. It is not necessarily a food safety issue," said Sharp. Signals that food should be thrown away are more distinct, like visible mold, slime, leaking liquid, or a strong unpleasant odor, clear indications that produce has broken down beyond the point of safe consumption, according to Sharp.
Think of the Impact Outside Your Kitchen
Throwing away food also discards the results of all the resources used to grow, transport, and store it. But small habits can make a big difference, like buying what you need, using items before they sit too long, and freezing produce like berries or bananas before it goes bad. "Household food waste represents probably the largest portion of food waste when we look at it across the whole supply chain," said Pete Pearson, a vice president at World Wildlife Fund. And that waste also produces a potent greenhouse gas that harms the planet long after discarded food leaves the kitchen.
"When food enters landfills, it is essentially buried in a non-oxygen environment where it breaks down and creates bacteria and methane emissions," said Pearson. But because people interact with food every day, even small shifts can add up, depleting fewer resources across the broader food system. "It is these small changes over millions and millions of people that can make a huge difference," said Pearson.
