Mushrooms in your lawn: are they poisonous?

The short answer

Mushrooms in your lawn are the fruiting bodies of a fungus that lives in the soil, feeding on dead roots, buried wood or thatch. They do not harm the grass and removing them does not kill the fungus. The danger is to small children and pets who put things in their mouths: some common lawn species cause hours of vomiting, and deadly Amanitas can appear in grass under trees. You cannot tell a poisonous mushroom by looking, so remove them, keep kids and dogs away, and if someone has eaten one, call Poison Help on 1-800-222-1222 (US) or NHS 111 (UK) without waiting for symptoms.

Kids and pets first

Toddlers go through a "grazing" phase where anything in reach goes in the mouth, and slightly older children may not see the difference between pizza mushrooms and yard mushrooms. Michigan State University's extension bulletin notes that children are particularly susceptible to mushroom poisoning, because a smaller dose makes a small body ill. Colorado State University Extension says that in home lawns the primary reasons for removing mushrooms are to protect children and pets.

If a child or a pet may have eaten part of a lawn mushroom:

1. Take whatever is left out of their mouth and keep it. Pick a whole example of the same mushroom, including the base, and put it in a paper bag.
2. Call now, do not wait for symptoms. US: Poison Help 1-800-222-1222, free and open 24/7 (Minnesota Poison Control: "Do not wait for symptoms to appear"). UK: NHS 111 if you are not sure, 999 if they are unwell. For a dog or cat, call your vet or an animal poison line; see what to do if your dog ate a mushroom.
3. Do not make them vomit. The NHS says do not try to make someone sick; they could choke.
4. Photograph the mushroom from the top, the underside and the dug-up base. The poison center may ask for the photos.

The delay matters. The most dangerous toxins, the amatoxins, cause no symptoms for 6 to 24 hours after eating, while the damage to the liver has already begun. "They seem fine" is not reassurance.

Common lawn mushrooms and what they do

No list covers every lawn, and no photo-only identification is reliable. These are the species that come up most often in questions about yard mushrooms in the US and the UK.

Green-spored parasol (Chlorophyllum molybdites)

This is the big white mushroom that appears in rings across American lawns after summer rain. MushroomExpert.com describes caps of 10 to 22 cm growing in "lawns and meadows", often in fairy rings, and widespread east of the Great Plains. It is not deadly, but NAMA calls it "the most common mushroom cause of human poisonings in North America", with severe vomiting and diarrhea that can include blood. The give-away is the gills: white when young, then gray-green as the spores mature, with a dull grayish green spore print. Young specimens look like edible parasols, which is how people get poisoned. Read the green-spored parasol page and the parasol vs false parasol comparison.

Fairy rings

Rings of mushrooms in grass are usually the fairy ring champignon, which First Nature describes as thriving "in public lawns and parks" from June to November in Britain. It is widely regarded as edible, but the same page warns that toxic Clitocybe rivulosa and Clitocybe dealbata also form fairy rings in grassy places, and that the ring alone must not be used to identify anything. Michigan State lists Clitocybe dealbata among its poisonous species. For a lawn owner the practical answer is simple: a ring is not a reason to eat anything.

Destroying angel and death cap

These are the lawn mushrooms that kill. The eastern US destroying angel (Amanita bisporigera) grows with oaks and other hardwoods and is "widely distributed and common in eastern North America", so it appears in grass under yard trees, not only in forests. The California health department notes that death caps and western destroying angels "can appear in neighborhoods and parks, not just wilderness areas". Look for a pure white (or olive-yellow) cap, a skirt-like ring on the stem and a white sac around the base, which may be buried in the soil. Symptoms are delayed by 5 to 12 hours or more. See the destroying angel and death cap pages, and the meadow mushroom vs destroying angel comparison, because white Agaricus and white Amanitas share lawns.

Field mushrooms and ink caps

Not every lawn mushroom is a villain. The field mushroom (meadow mushroom in the US) and the shaggy ink cap are foraged from lawns in both countries. Both have dangerous or unpleasant look-alikes, covered on the field mushroom vs yellow stainer and shaggy mane vs inky cap pages. Nothing on this page is a clearance to eat a lawn mushroom; it is a guide to the risk.

How to remove mushrooms from your lawn

1. Pick or rake them as soon as they appear. Colorado State Extension recommends raking, mowing or hand-picking the visible mushrooms. Minnesota Poison Control says to remove and dispose of them after rainfall, which is when new flushes appear.
2. Bag them and put them in the trash, out of reach of children and dogs. HealthLinkBC advises placing a death cap securely in a bag in the regular garbage and not in a home compost pile, which can spread the fungus.
3. Wear gloves if you prefer, and wash your hands. Touching a death cap is not a risk according to HealthLinkBC; the toxin acts when it is eaten. Wash with warm water and soap afterward.
4. Skip the fungicide. Colorado State says fungicides are not recommended for mushrooms and fairy ring in lawns, and that removing the mushrooms does not kill the fungus underground.
5. Reduce what feeds it. Buried wood, old roots, thick thatch, shade and over-watering keep the fungus productive. If one patch fruits every year, dig out the buried wood if you can find it.

Expect the mushrooms to return after the next wet spell. That is normal and not a sign that the lawn is sick.

Should you identify them?

If you only want the lawn safe, you do not need a name: remove the caps and keep watch. Identification matters when someone or something may have eaten one. Then the poison center or vet will ask what it was, and a bagged sample plus clear photos of the cap, the gills and the dug-up base are far more useful than a description. Our guide to photographing a mushroom for identification covers the four photos to take, and how to tell if a mushroom is poisonous explains which features matter and which folk rules fail.

Free help exists. Local mycological societies (NAMA club list in the US, BMS groups in the UK) identify finds in person, and iNaturalist's community will suggest a name from photos, though confirmation can take days and is never a safety clearance.

Using an app to check a lawn mushroom

An app is a fast first look, not an answer. Mycoscout asks for up to four photos (cap, gills, stem with the base, and habitat), puts the edibility verdict at the top of the result, shows how confident it is, and names the dangerous look-alikes with how to tell them apart. For a lawn find that means it will push you to dig up the base and check for a sac, which is exactly the feature that separates a deadly Amanita from a harmless lawn mushroom. It cannot see what you did not photograph, and no app clears a mushroom for eating. Keep the bagged sample and the poison center number regardless. How Mycoscout works.

Frequently asked questions