Storing onions and potatoes together? This common habit may be ruining both

Most kitchens have that one basket under the counter where the onions and potatoes end up together, mostly because it saves space and because nobody ever questioned it growing up. It feels harmless enough, since both vegetables ask for roughly the same conditions to begin with — somewhere cool, dry and out of the light. But sharing a storage style doesn't mean they're good company, and keeping them in the same bin is quietly working against both.

What's actually going on in that basket

Onions give off a gas as they sit around, the kind that signals nearby produce to ripen faster than it normally would. Potatoes pick up on that signal even though ripening is the last thing they need, since their whole point in storage is to stay still and dormant for as long as possible.

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So instead, they start sprouting earlier than they should, with eyes pushing through the skin and patches of green creeping in that aren't just unattractive — they're a sign that compounds you don't want to be eating in any real quantity are starting to build up.

The starch inside begins converting to sugar to fuel all that unwanted growth, which leaves you with a potato that tastes sweeter, feels softer, and cooks worse than it would have otherwise.

Onions don't come out of this unscathed either. Potatoes hold a surprising amount of moisture, and in a shared container, that moisture seeps outward into whatever's sitting next to it. Onions can't handle that kind of damp environment, so they go from firm and dry to soft, browning and faintly mouldy far sooner than they would on their own.

It isn't really a one-sided problem at all, just two different mechanisms working in opposite directions at the same time — gas pushing one way, moisture pulling the other, until both vegetables have quietly worn each other down.

It's also worth saying that the overlap in their needs is genuine rather than imagined. Both do better away from light, both spoil faster when it's warm or humid, and both prefer some airflow over being sealed away entirely.

That's part of why grocery stores often shelve them close together in the first place, and why so few people think twice about doing the same thing once they're home.

A fix that doesn't ask for much

None of this calls for rearranging your whole kitchen. Distance is really the entire solution, even if it's just a few feet, or a separate shelf, or putting one in a bag on one side of the pantry and the other in a crate on the opposite side. The goal is simply to stop one vegetable from sitting close enough to affect the other.

The fridge isn't a workaround for either of them, since the cold does its own kind of damage by converting starch to sugar long before you've had the chance to cook with it.

Sealed plastic isn't much better, because it traps the exact things — gas, moisture — that both vegetables need to be rid of. Garlic, interestingly, can still sit beside onions without much issue, since it isn't affected by the gas they release, though it should stay away from potatoes for the same moisture-related reasons. Apples and bananas deserve a similar distance from potatoes too, given they produce that same ripening gas in their own right.

In the end, it isn't really the vegetables that were ever the problem. It's the basket they were both stuck sharing.