Can you pick mushrooms in cities and parks?

As soon as the warm rains come, mushrooms appear not only in the forest. You can spot them on city lawns, in parks, squares, yards and even along roadsides. Some of them are perfectly edible species, such as the fairy ring champignon or the field mushroom. It's tempting to gather a “free harvest” right outside your door. But you shouldn't.

Let's look at why urban mushrooms are dangerous even when the species is edible, and where it's truly safe to forage.

Why urban mushrooms are dangerous

The danger of urban mushrooms lies not in the species, but in the place where they grow.

A mushroom works like a sponge: the mycelium soaks up water from the soil along with everything dissolved in it. In a city, the soil is saturated with heavy metals from exhaust fumes, industrial emissions and road dust. Lead, cadmium and other toxins build up in the fruiting body, often at higher concentrations than in the soil itself.

So even a perfectly edible mushroom that grew in a park or by a road can contain a dangerous dose of toxins. It looks no different from one grown in the forest. More on this in our article on mushrooms near roads and cities.

Why cooking doesn't help

Many hope the harm can be “washed off” or “boiled out.” It can't.

Heavy metals accumulate in the very structure of the mushroom, not on its surface. Neither washing, soaking nor long boiling removes them. Unlike dirt, these toxins can't be removed by cooking, so the only protection is not to pick mushrooms in polluted places.

An extra danger: stray poisonous mushrooms

Urban green spaces also hold a direct threat: poisonous mushrooms.

On lawns and under trees in parks you can even find the death cap, as well as amanitas. Casual pickers, especially children, may take them for edible ones. So urban mushrooms are doubly dangerous: from accumulated toxins and from the risk of misidentifying the species.

If you notice children playing with mushrooms in a yard or park, it's best to explain to them that wild mushrooms are neither toys nor food from the lawn.

Where it's safe to forage

The conclusion is simple: only clean, natural places are fit for foraging.

1. Head to the forest, far from roads. The deeper into clean forest, the safer.
2. Avoid cities, parks and roadsides. Mushrooms there are for admiring, not for your basket.
3. Steer clear of industrial zones and landfills. The soil there is the most polluted.
4. Pick only species you know. And follow the rules of safe foraging.

Mushrooms on a city lawn are a fascinating natural phenomenon, but let them stay a decoration, not a dinner. The real harvest awaits in a clean forest.

Sources

• “Key to the Fungi of Ukraine” (Kyiv, Naukova Dumka publishing house).
• Marasmius oreades in GBIF, a global biodiversity database.
• Fungi in MycoBank, the international fungal nomenclature database.
• Bioaccumulation on Wikipedia.