Should you wash vegetables before putting them in the fridge?

The short answer: for most produce, wash it when you are about to eat it rather than when you get home. Washing before storage feels like getting ahead of the work, and for the majority of fruit and vegetables it shortens their life measurably — not because water is dirty, but because leftover moisture is exactly what mould and soft rot need to get started.

Why moisture is the problem

Mould spores and the bacteria that cause soft rot are present on essentially all fresh produce. They arrive from the field, the packing line and the shop, and they are not a sign that anything has gone wrong. What they need to actually grow is free water sitting on the surface of the food, plus time.

Dry produce keeps those organisms in a holding pattern. Damp produce, sealed into a bag or a drawer where nothing evaporates, gives them what they were waiting for. This is why a punnet of berries washed on Sunday can be furry by Tuesday, while the identical punnet stored dry lasts most of the week — the difference is not cleanliness, it is surface water.

The effect is strongest on things with delicate skin or a lot of crevices: berries, mushrooms, herbs, salad leaves. It is weakest on things with a thick, waxy skin, which is why the rule matters much less for peppers or apples than for raspberries.

The specific cases worth knowing

Berries. The clearest example. Store them dry and unwashed, and rinse just before eating. If you must wash them ahead, dry them thoroughly and store them lined with something absorbent — but dry storage is simply better.

Mushrooms. Mushrooms absorb water rather than shedding it, so washing them before storage leaves them soggy and speeds up the slimy stage. A brush or a dry cloth does the job, and a quick rinse immediately before cooking is fine.

Leafy greens and herbs. These are the exception in one direction: they wilt from moisture loss, so they want humidity around them but not water on them. Washed and thoroughly dried greens can keep well in a container with a dry cloth, which absorbs excess water while keeping the air around the leaves humid. Washed and left wet, they go slimy quickly.

Root vegetables and anything with soil on it. Leave the soil. It is doing no harm in a cupboard or a drawer, and washing removes a protective layer and introduces the moisture problem at the same time. Potatoes in particular keep far better unwashed, and they belong somewhere cool and dark rather than in the fridge at all — below about 7°C an enzyme in the potato starts converting starch to sugar, which changes how they taste and how they behave in a pan.

Anything you are about to eat this evening. The rule is about storage, not about hygiene. Washing before eating is worth doing.

The one thing worth doing when you get home

If there is a version of prep that pays off at the moment of unpacking, it is not washing — it is removing whatever is already going. One mouldy berry in a punnet will spread to its neighbours through direct contact, and a single soft, wet leaf in a bag of salad accelerates everything touching it. Thirty seconds of sorting out the casualties does more for the rest of the bag than any amount of rinsing.

The second is loosening the packaging. Produce sealed in a bag it was transported in is often sitting in its own condensation. Opening it, or swapping it for something that breathes, removes standing water without removing humidity.

Where the real losses happen

It is worth putting this in proportion. Washing at the wrong time costs a few days on a punnet of berries. Forgetting the punnet costs the whole thing. Almost all household produce waste comes from things that quietly stopped being visible — pushed behind something taller, moved into a drawer, bought on a day when the plan changed.

That is the gap Munch is built to close: each item goes in with where it is stored and the day it arrived, everyone in the household sees the same list, and the oldest items surface first rather than depending on somebody remembering to look in the drawer. Storing produce dry buys you days; knowing it is there is what lets you use them.

Wash before eating, sort out the casualties when you unpack, and let the rest stay dry until it is needed.