How to Store Onions, Potatoes, and Garlic So They Last for Months

Onions, potatoes, and garlic are the quiet workhorses of almost every kitchen. They turn up in soups, stir-fries, roasts, and weeknight pastas — and because we buy them in bulk and reach for them constantly, they’re also some of the most commonly wasted staples. A bag of potatoes sprouts in the corner, an onion goes soft in the drawer, garlic turns bitter and green in the middle.

The good news? These three keep beautifully when you store them right — often for a month or more. With a few small changes to where and how you stash them, you can stop tossing money in the bin and always have the building blocks of a good meal on hand.

Why These Three Need Special Treatment

Onions, potatoes, and garlic are all storage crops — grown to survive long winters in a root cellar. That means they want conditions most modern kitchens don’t naturally offer: cool, dark, dry, and well ventilated. Get those four things right and you’re most of the way there.

The biggest mistakes people make are keeping them on a sunny countertop, sealing them in plastic bags, or stashing them in the fridge — all of which shorten their life dramatically.

How to Store Potatoes

Potatoes want cool and dark, but not cold. Below about 4°C (fridge temperature), their starch begins converting to sugar, which makes them taste oddly sweet and turn dark when cooked. Aim for a cool cupboard, pantry, or a ventilated basket in the coolest corner of your kitchen.

• Keep them in a paper bag, a cardboard box, or a mesh basket — never a sealed plastic bag, which traps moisture and speeds rot.
• Store them in the dark. Light triggers greening and the production of solanine, a bitter compound best avoided.
• Don’t wash them until you’re ready to cook. Dampness invites mould.
• Check the bag now and then and remove any that turn soft — one bad potato really does spoil the bunch.

Stored well, potatoes can last a month or longer.

How to Store Onions

Onions love the same cool, dark, dry conditions as potatoes — with one important twist: keep them apart from each other. Potatoes release moisture and gases that cause onions to sprout and rot faster, so give them separate homes.

• Store whole, unpeeled onions in a mesh bag, a wire basket, or even an old (clean) pair of tights — anything that lets air circulate.
• Keep them out of the fridge. The humidity makes them soft and mouldy.
• Once you cut an onion, though, the rules flip: wrap the leftover half tightly and refrigerate it, using it within a few days.

Whole onions kept in a cool, airy spot can last a month or two. Spring onions and scallions are the exception — those belong in the fridge, and you can even freeze them chopped for later.

How to Store Garlic

A whole head of garlic is remarkably hardy. Left intact in a cool, dry, airy place — the same conditions as onions — it can keep for months. The trouble starts once you break the head open or peel the cloves.

• Keep the head whole until you need it. Don’t peel or separate cloves in advance.
• Store it in an open container, a garlic keeper, or a little mesh bag — never sealed in plastic.
• Skip the fridge for whole garlic; the cold and damp encourage sprouting and rubbery texture.
• Peeled cloves are a different story — refrigerate them in an airtight container and use within a week, or freeze them.

Notice a green shoot in the centre of a clove? It’s harmless, just a little bitter — slice it out before cooking.

What to Do Before They Turn

Even with perfect storage, things eventually start to go. That’s your cue to cook, not to bin. Slightly soft onions are perfect for caramelising. Sprouting potatoes are still fine to eat — just cut away the sprouts and any green patches first. Garlic that’s past its prime can be roasted whole into something sweet and mellow.

• Dice and freeze a big batch of onions for instant soup and sauce bases.
• Turn softening potatoes into mash, soup, or a tray of roasties.
• Roast a whole head of garlic and spread it on toast or stir it into dressings.

Not sure what to make with what’s on hand? Our guide to cooking with what you have is a great place to start, and leftover transformation ideas can help you stretch the rest of the fridge too.

Keep Track So Nothing Gets Forgotten

The single biggest reason staples go to waste isn’t bad storage — it’s forgetting they’re there. A five-kilo bag of potatoes is easy to lose track of at the back of a cupboard. That’s exactly where a little organisation pays off.

Food Waste Manager lets you log what you’ve got and reminds you before it turns, so those onions, potatoes, and garlic actually make it into dinner. Pair it with a quick weekly stock-take — a habit we cover in how to read your fridge like a chef — and you’ll waste less, spend less, and always have the makings of a good meal in the cupboard.