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How to keep your mushrooms fresh

Tips and advice. - by Rhys McKay
  • 21 Oct 2019
How to keep your mushrooms fresh
Getty

How long do cooked mushrooms last? Most mushrooms have a maximum shelf life of over two weeks, though it can change depending on the specific type of mushroom and its preparation. If you want to extend the shelf life of your mushrooms, storing them in a closed container with limited oxygen is a good place to start. Here’s what you should do when you find yourself with a few extra mushrooms that you aren’t planning to use anytime soon.

RELATED: How to grow mushrooms

Do mushrooms go off?

According to IFCO Systems, mushrooms go off after a week or two but that can be extended by cooking and storing them. As a general rule, exposure to air is the biggest thing that can affect the freshness of your mushrooms, followed by whether you have already cooked it, and then the kind of mushroom you have.

Bigger species of mushrooms (like porcini, shiitake, or cremini mushrooms) last longer because of their large size and less exposed surface area. Smaller mushrooms like the long white enokitake or any other species of long skinny mushrooms don’t last as long, because their small surface areas make them vulnerable to oxidation.

Two hands holding mushrooms
Getty

How long do mushrooms last?

Check with your grocer or market seller for advice on the shelf life of your specific mushroom. According to ICFO’s research on mushroom packaging:

Sliced and chopped mushrooms last for about a week. Since the insides are exposed, they’re more prone to airing and drying out.

Whole, unsliced mushrooms can last for over two weeks. Freshly harvested mushrooms (the ones you can get from a farmer’s market like Fresh Field and not pre-packaged in plastic) last a little longer.

Cooked mushrooms are good for a little under two weeks. However, the way you cook the mushrooms and the ingredients you used can affect this, as you’ll see below.

Dried mushrooms last for about a month, though that comes at the cost of diminished flavour. If stored well, they can last for half a year.

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How to tell if mushrooms are off

But what if you’re not quite sure how long you’ve stored your mushrooms? Luckily, there are some clear signs that can easily let you know if your mushrooms have gone off:

  • Smell: mushrooms don’t really have much of an odour, so when you can smell them before you open the packaging it’s likely they’ve gone bad.
  • Wrinkles: some mushrooms dry out instead of developing mould. If your mushrooms look more like prunes, it’s time to throw them out.
  • Spotting: dark spots mean that your mushrooms are losing their freshness.
  • Texture: slimy mushrooms mean that moisture has seeped into their innards, making them more vulnerable to things like mould and mildew. You can cook them to extend their shelf life a little more, but it’s better to throw them out.
Mushrooms on a wooden chopping board
Getty

How to keep mushrooms fresh for longer

For those particular about flavour, storing mushrooms properly is the key to preserving their freshness. Here are some tips that you can follow:

Know how much you’ll use. You don’t have to worry about keeping mushrooms fresh if you use them all in one go. If there are any left over, it won’t be as much trouble to store them.

Let them breathe. If you’ve taken the mushrooms out of their packaging, storing them in a paper bag in the fridge is ideal. This prevents them from spoiling faster.

Steam, saute, then freeze. It’s possible to extend the shelf life of raw mushrooms by cooking them. Freezing mushrooms this way requires airtight containers or freezer bags to make sure no airborne contaminants get in.

Better safe than sorry

If your mushrooms smell funny or look strange, it’s probably best to throw it out. It may be a waste of food, but it’s a small price to pay for your health and safety. Just remember to only buy a smaller amount next time and follow the tips above for better storage!

RELATED: Minute Steak with Soy Mushrooms

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