Agaricus arvensis

Horse mushroom

A large white Agaricus of meadows and stable yards that smells of almonds and stains yellow. It fruits from July to November, often in fairy rings with nettles in nutrient-rich soil. It is a choice edible, but young buttons can be confused with deadly white Amanita species.

Agaricus arvensis — Photo: Luridiformis at English Wikipedia, CC BY 3.0, via Wikimedia Commons

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Very humid airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

No rest period

Where it grows wild

Meadows, pastures and around stables in nutrient-rich soil, often with nettles and in fairy rings; on the North American west coast associated with cypress, in the east with spruce.

Recorded at 5–3318 m, median 430 m (69 records).

EuropeWestern AsiaNorth America

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 3.0 licence, unmodified.