Drying mushrooms concentrates their flavour, extends their shelf life, and transforms them into a versatile kitchen staple. The key is controlling temperature and airflow to preserve the umami compounds that make mushrooms so valuable in the kitchen. I’ll walk you through the methods that work best, why they matter, and how to use what you’ve dried.
Why dry mushrooms at all?
Fresh mushrooms are mostly water. When you remove that moisture slowly and carefully, you concentrate the compounds that make mushrooms taste rich and savoury. The umami deepens. A handful of dried mushrooms can flavour a stock, a risotto, or a braise in ways that fresh ones simply cannot, because the flavour is denser. Dried mushrooms also last months in an airtight container, which means you always have one ready when a recipe calls for them.
I work with both foraged and cultivated mushrooms at Adi's Urban Mushrooms, and drying is one of the most reliable ways to make the most of a seasonal or abundant harvest. Whether you’ve grown them from one of our kits, picked them on a forage walk, or bought fresh from a market trader, drying locks in that moment of peak flavour. It’s also one of the oldest food preservation techniques in the world—there’s nothing experimental about it.
What temperature and time do you need?
Low and slow is the rule. The ideal temperature range is 35–45 °C, which you can achieve with a conventional oven on its lowest setting, a food dehydrator, or simply good air circulation in a warm, dry room. At this temperature, mushrooms dry in 4–12 hours depending on size and thickness. Slice them evenly—roughly 5 mm thick—so they dry at the same rate. Thicker pieces will take longer and may trap moisture inside, which invites mould.
Why not higher heat? Above 50 °C, you begin to lose volatile compounds—the aromatic oils that carry the flavour you want to preserve. You also risk cooking the outside while moisture gets trapped inside. I’ve learned through working with the Community Mycology Lab at Remakery Brixton that patience here pays off in the cup, the plate, and the store cupboard. The slower the dry, the better the result.
Which drying method works best at home?
You have three realistic options. A dedicated food dehydrator gives you the most control: consistent temperature, adjustable trays, and even airflow. It’s the method I’d recommend if you’re drying mushrooms regularly. An oven with the door cracked open works well if you’re patient—just monitor them and rotate trays halfway through. A warm, dry, well-ventilated room (or even a clean cardboard box with holes punched in it, placed near a radiator or in sunlight) will work for small batches, though it takes longer and requires more oversight.
At our West Norwood Feast market stall, I use a dehydrator for our dried mushroom products because consistency matters when you’re selling. But I’ve also dried mushrooms in a cool oven at home, and the technique is sound. Whatever you choose, the mushrooms should be arranged in a single layer without touching, so air moves freely around them. If they overlap, they’ll steam rather than dry.
How do you know when they’re properly dried?
Properly dried mushrooms should feel papery and brittle, with no moisture when you bend them. They should snap cleanly, not flex. If there’s any give, any softness, any hint of dampness, they’re not ready. Return them to the heat for another hour or two. This matters because any residual moisture invites mould and will shorten their shelf life significantly.
The safest test is the touch test: pick one up, let it cool slightly, then bend it sharply. If it breaks cleanly, you’re done. If it bends or feels leathery, keep drying. Once they’re completely dry, let them cool to room temperature on the tray before storing them. Storing them while warm traps steam inside the container, which can cause condensation and spoilage.
How do you store dried mushrooms?
Airtight containers are non-negotiable. Glass jars with rubber seals, or food-grade plastic containers with clip lids, work well. Keep them in a cool, dark, dry place—a cupboard, not above the stove or near a window. Properly dried and sealed mushrooms will last 6–12 months, though the flavour does gradually fade. I label mine with the type and the date so I know what I have and how old it is.
Avoid moisture and light, both of which degrade flavour and texture over time. Some people add a small silica gel packet to absorb any trace humidity, which is a useful precaution if your kitchen is particularly damp. In South London, where we work with foraged and cultivated mushrooms year-round, we’ve found that proper storage is often the difference between a dried mushroom that tastes like the original and one that tastes stale or dusty.
How do you use dried mushrooms in cooking?
Rehydrate them in hot water or stock 15–30 minutes before use. The soaking liquid itself becomes a deeply flavoured liquid gold—use it in the dish you’re making instead of plain water. The ratio is roughly 30 g of dried mushrooms to 250 ml of liquid, though you can adjust based on how intense you want the flavour. Soak them, strain the liquid carefully to remove any sediment, chop the rehydrated mushrooms, and add both back to your pot.
Dried mushrooms are also delicious ground into a fine powder and used as a seasoning—sprinkled over pasta, stirred into butter, or layered into stocks and sauces. At Adi's Urban Mushrooms, we make seasoned powders using dried mushrooms from our harvests, and they’re one of the most versatile products we produce. A teaspoon brings deep, savoury depth to almost anything. You can also crumble them directly into soups or stews if you don’t mind the texture, or grind them fine in a spice mill for a more refined finish.