Mushroom season in Switzerland: what grows in the forest, what belongs on the plate and what foragers need to know

From August, porcini, chanterelles and bay boletes push up through the leaf litter, and button and oyster mushrooms sit on supermarket shelves all year round. Mushrooms are neither plant nor animal but a kingdom of their own, and as a food they are something of an oddity too. This article shows what makes mushrooms distinctive, when the season runs in Switzerland, which species are worth knowing and which look-alikes to watch for, what to consider in the kitchen, and what vital mushrooms such as reishi and cordyceps are.

Mushrooms are neither plant nor animal: what you see in the woods is only the fruiting body

What we collect in the woods is only a small part of the organism: the fruiting body, which serves reproduction and spreads spores. The actual fungus is the mycelium, a network of very fine threads that runs through soil or wood and is often widely spread. Fungi have no chlorophyll and do not photosynthesise, their cell walls contain chitin, and genetically they are closer to animals than to plants.

How a fungus lives determines where you find it. Many popular edible species such as porcini, chanterelle and bay bolete form a mycorrhiza with trees, a partnership at the roots: the fungus supplies the tree with minerals and receives sugar from photosynthesis in return. Around 90 per cent of land plants live in such partnerships. Other fungi, known as saprotrophs, break down dead wood or leaves, and others are parasites. Around 120,000 species of fungi have been described worldwide, and more than 5,000 are known from Switzerland.

Mushroom season in Switzerland: August to November is the time to head into the woods

In Switzerland the main season runs roughly from early August to the end of November. What comes out of the ground in that period depends on the weather: for porcini, for example, cool, damp nights speed up growth, and frost usually ends the season. Individual species have their own windows, which in Central Europe are roughly distributed as follows:

Mushroom	Window in Central Europe
Common morel	April to June
Chanterelle	June to November
Porcini	from June, main harvest August to October
Parasol	July to November
Bay bolete	main season mid-September to November

Foraging with rules: what goes in the basket and what stays in the woods

The rules are set by the cantons: in the Canton of Zurich, foraging is not permitted during the first ten days of each month and each person may collect up to one kilogram per day, while in the Canton of Bern the limit is two kilograms. Picking is generally prohibited in nature reserves. The current regulations are compiled by the Swiss Association of Official Mushroom Inspectors (VAPKO) at vapko.ch.

VAPKO gives a set of practical rules for foraging:

• Use only baskets with good ventilation, never plastic bags: mushrooms decompose quickly, and even edible species can become toxic.
• Take only mushrooms in perfect condition. Leave wormy specimens as well as very young and overripe mushrooms, and leave rare species alone.
• Twist mushrooms carefully out of the ground without damaging the base of the stem, and cover the hole again so the mycelium is not harmed.
• Give them a rough clean in the woods and remove soil and needles, but keep the features of the stem base intact.
• Pack unknown species separately, for example in newspaper, and take only two or three specimens of each. It helps to note the location and surroundings.
• Do not destroy toxic and inedible mushrooms, because they have a role in the forest ecosystem.

Folk rules such as the silver spoon or onion test are useless, and the belief that cooking makes any toxic mushroom harmless is a myth. On protecting populations: of the more than 5,000 fungal species in Switzerland, around 3,000 have been assessed for the Red List, and 32 per cent of those are threatened. The threat stems mainly from the loss of habitats such as bogs and unfertilised meadows, while woodland fungi suffer from a lack of deadwood. Cantonal closed seasons and quantity limits are meant to protect the sites further.

Five edible mushrooms in profile: porcini, chanterelle, bay bolete, parasol and sheathed woodtuft

Porcini. Its cap measures six to 25 centimetres and is brown to hazelnut-coloured, and the stem is white with a fine net pattern. The flesh is white and firm when young and does not turn blue when cut. It grows in partnership with spruce, fir, oak, beech, pine and other trees. It can be fried, braised and stewed, and dried it keeps its strong aroma. It cannot be cultivated commercially so far, so porcini in shops come from wild harvest.

Chanterelle. The golden-yellow cap becomes funnel-shaped over time, and instead of gills the underside has forked ridges running down the stem. The flesh is firm, smells fruity like apricot and tastes mild to peppery. It grows near spruce and beech, from June to November. Fresh chanterelles are more than 90 per cent water.

Bay bolete. The cap is dark to chestnut brown, the tubes are cream-yellow at first, later olive-green, and turn distinctly blue-green when pressed. It grows mainly in old spruce forests or under larches, has its main season in autumn and is often infested with maggots. Young specimens are therefore the better choice, and it dries very well. Like some other species, it must be cooked thoroughly.

Parasol. It is unmistakably large: the cap measures 12 to 30 centimetres, and the stem bears a brown snakeskin pattern on a light background and a movable, double ring. The white flesh does not change colour when damaged. It grows in light deciduous woods, on meadows, at woodland edges and in parks, from July to November. Usually only the caps are eaten, breaded and fried like a schnitzel. The stems are tough but can be made into mushroom powder.

Sheathed woodtuft. These small to medium-sized mushrooms have brownish-yellow, oily-shiny caps and grow in clusters on deciduous wood. The common form, with a ring on the stem, is a popular edible mushroom. Because there is a deadly look-alike, the funeral bell (Galerina marginata), it belongs among the species you eat only after certain identification and inspection.

These are the look-alikes to know, and the mushroom inspection is still necessary

Most mushroom poisonings occur because toxic species are mistaken for edible ones. Tox Info Suisse puts mushroom poisonings at around two per cent of all enquiries and sees them cluster in September and October. The death cap is particularly feared: untreated, poisoning can be fatal, and the Swiss poison information centre records up to eight cases a year. In any mushroom poisoning, ruling out death cap poisoning is the priority. The most important pairs at a glance:

Edible mushroom	Look-alike	Distinguishing feature
Field mushroom	Death cap	The field mushroom has pink to brown gills, the death cap always white ones. The field mushroom grows more on meadows, the death cap often under trees.
Porcini	Bitter bolete	The bitter bolete has a dark net on the stem, its tubes turn pink with age, and it tastes bitter. In porcini the underside turns greenish.
Chanterelle	False chanterelle	In cross-section the true chanterelle shows white flesh with a yellowish edge, the false one is yellowish to orange throughout. The false one has thin gills instead of ridges, softer flesh and less scent.
Common morel	False morel	The morel has a honeycomb-like, fully hollow cap. The false morel shows brain-like, lobed convolutions and is not fully hollow.
Parasol	Toxic Chlorophyllum parasol, freckled dapperling	The parasol has a snakeskin stem and a movable ring. The toxic parasol has an unpatterned stem and reddens when damaged; the freckled dapperling is smaller and has a fixed ring.
Giant puffball	Potato earthball	Harvest only giant puffballs that are white outside and inside. The earthball has a thick, brownish skin.

Such features are guidance, not a substitute for inspection. Wild mushrooms you have collected should therefore be checked at an official mushroom inspection point before cooking. Inspection is free of charge in most municipalities during the season, and the Canton of Zurich alone has 31 inspection points. You bring the mushrooms cleaned, free of soil and leaves, sorted by species and complete: everything you collected, not just the pieces that seem safe. Anyone who eats uninspected mushrooms bears the responsibility personally, since according to the FSVO (BLV) wild mushrooms collected for personal use fall outside food legislation. If you suspect poisoning, Tox Info Suisse can be reached around the clock on 145.

Farmed mushrooms are available all year: button mushrooms, oyster mushrooms and shiitake

Not every mushroom comes from the woods. Button mushrooms, oyster mushrooms and shiitake come from commercial mushroom farms and are available all year. For button mushrooms, the darker they are, the more intense their flavour. Oyster mushrooms have firm flesh, shell-shaped caps and a robust aroma. Shiitake contain, among other things, B vitamins and minerals such as potassium and zinc.

Farmed mushrooms grow on controlled substrates and generally contain little caesium-137. In Switzerland, the Ordinance of the FDHA on Foodstuffs of Plant Origin, Fungi and Table Salt (VLpH) governs which edible mushrooms may be placed on the market. The FSVO recommendation applies to farmed mushrooms as well: do not eat mushrooms raw, so neither in salads nor as a snack.

What sets mushrooms apart nutritionally: plenty of water, few calories and special substances

Mushrooms consist largely of water and accordingly provide little energy. Reference values per 100 grams of fresh mushrooms:

Mushroom	Calories	Protein	Fat	Carbohydrates
Button mushroom	19 kcal	2.7 g	0.2 g	0.6 g
Chanterelle	22.9 kcal	1.6 g	0.5 g	0.2 g
Porcini	33.8 kcal	3.6 g	0.4 g	0.5 g
Oyster mushroom	38 kcal	3.5 g	0.2 g	2.6 g
Shiitake	42.8 kcal	1.6 g	0.5 g	7 g

Two substances make mushrooms special. Mushrooms contain ergothioneine, a sulphur-containing amino acid that humans cannot make themselves and obtain through food. According to a review, edible mushrooms are by far the most important dietary source, while most other foods contain it only in small amounts.

The second is vitamin D2. Under UV light, mushrooms convert ergosterol into vitamin D2, much as our skin makes vitamin D in sunlight. How much a mushroom contains depends strongly on species and origin. Analyses by the US Department of Agriculture found only about 0.1 µg per 100 g in white button mushrooms that had not been UV-treated, but around 5 µg in chanterelles and morels, and UV-treated portobello mushrooms reached 3.5 to 18.8 µg.

In the kitchen: how to clean, store, cook and reheat mushrooms

Cleaning. Mushrooms can be wiped with a damp cloth or rinsed briefly under running water. The worry that they soak up too much water in the process is regarded as a myth. Soil, needles and damaged spots are removed with a knife.

Storing. Fresh mushrooms belong spread out loosely in the fridge or a cool cellar, not in closed bags. They spoil quickly, and not only toxic but also spoiled mushrooms cause illness. It is best to process mushrooms as soon as possible after foraging or buying.

Cooking. VAPKO advises: do not eat raw mushrooms. Thorough cooking destroys harmful substances in many wild species, for example the blusher, honey fungus, scarletina bolete (Neoboletus luridiformis) and bay bolete. Even farmed mushrooms can cause digestive problems in sensitive people when raw. Dried mushrooms must also be heated thoroughly, and the soaking water is discarded.

Amount and digestion. Mushrooms contain proteins that are hard to digest. VAPKO recommends eating them as a side dish rather than a main meal, not swallowing large pieces and chewing thoroughly. Children should only eat mushrooms once they can chew properly, otherwise there is a risk of intestinal obstruction. Large amounts can cause nausea, vomiting or diarrhoea.

Reheating. The old rule that mushroom dishes must never be reheated is outdated. What matters is to cool leftovers quickly, keep them in the fridge at a maximum of +5 °C, eat them within two days and reheat them only once, but then heat them through thoroughly.

Enjoying them safely: cook morels for at least 20 minutes and eat wild mushrooms in moderation

In April 2026, Tox Info Suisse and VAPKO warned of severe gastrointestinal illness after undercooked morels. Raw morels contain hydrazine, which irritates the gastrointestinal tract and is removed by pre-cooking. Dried and frozen morels from shops also count as raw. The recommendation is to cook them for at least 20 minutes, whatever their form, and to eat no more than 100 grams of fresh or 10 grams of dried morels per person. Fresh morels are best dried first and then soaked.

Wild mushrooms can also still contain caesium-137 from the Chernobyl accident; in Switzerland, Ticino was the most affected region. According to the German Federal Office for Radiation Protection, the additional radiation dose remains comparatively low at usual consumption amounts. Wild mushrooms can also accumulate heavy metals such as lead, mercury and cadmium; what matters is the total amount.

Reishi and cordyceps: vital mushrooms have a long tradition in East Asia

Alongside the edible mushrooms of the forest, mushrooms such as reishi and cordyceps have long had a firm place in East Asia. In German-speaking countries they are usually known as «Vitalpilze», or vital mushrooms, and typically sold as extracts.

Reishi is called lingzhi in China and is a bracket fungus: a wood-dwelling mushroom with a hard, lacquer-like glossy fruiting body. It is not suitable as an edible mushroom. In China it has been used traditionally for centuries, was regarded as a talisman and hung in buildings to ward off misfortune.

Cordyceps, the Chinese caterpillar fungus (now Ophiocordyceps sinensis, still often called Cordyceps sinensis in products), has an unusual way of life: on the Tibetan plateau, at 3,000 to 5,000 metres, it infects the caterpillars of certain moths. The infected caterpillars overwinter in the soil, and in spring the fruiting body of the fungus grows out of their head. It has been collected for at least 1,000 years, and is described in Tibetan tradition from the 15th century and in China from 1694. The wild fungus is rare and in demand, and cultivated forms are also common on the Western market.

Anyone interested in vital-mushroom extracts looks for details on the part of the mushroom used, meaning fruiting body (the visible mushroom) or mycelium (the network of threads), on the extraction, and on the standardisation, for example a defined polysaccharide content. Pregnant and breastfeeding women and children should refrain from vital-mushroom extracts as a precaution, and anyone taking medication should first speak to a doctor or pharmacist.

Conclusion: mushrooms are a versatile seasonal food that calls for some knowledge and care

Mushrooms are a kingdom of their own, and what we collect in the woods is only their fruiting body. In Switzerland the main season runs from August to November, and anyone foraging follows the cantonal rules, takes only species they know for certain and has the whole harvest checked at an official mushroom inspection point. In the kitchen: process mushrooms fresh, do not eat them raw, cook them thoroughly, boil morels for at least 20 minutes and cool leftovers quickly. Nutritionally, mushrooms bring plenty of water, few calories, ergothioneine and, depending on UV light, vitamin D2.

Vital mushrooms such as reishi and cordyceps have a long tradition in East Asia and are available here as extracts. They are best understood as a traditional supplement, not a replacement for a balanced diet.

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This article provides general information about mushrooms and their constituents and does not replace medical advice, diagnosis or treatment. If you have health concerns, please consult a doctor or pharmacist.

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