White Button Mushroom Seeds / Spawn – Grow Fresh, Versatile Mushrooms at Home

Prepare a nutrient-rich substrate / compost (e.g. decomposed straw, manure, manure + straw mix) or use a pre-prepared mushroom grow kit.
Spread the spawn evenly over the surface of the substrate. Do not bury deeply — a thin, even layer is enough.
Maintain cool temperature (~12–18 °C or 55–65 °F) and high humidity (85–95%); cover trays or beds to help retain moisture; ensure good ventilation to avoid contamination.
Once mycelium has colonized the substrate (typically 10–15 days), apply a casing layer (peat / moist soil / vermiculite-based) about 3–4 cm thick to aid fruiting.
Maintain moisture by misting or gentle watering (avoid waterlogging), keep environment dark or in low-light, and wait — mushrooms should begin to appear in ~2–4 weeks.

Grow indoors (tray/box/substrate bag) if outdoor climate is too warm — mushrooms prefer cool, stable temperatures.
Maintain high humidity and cleanliness — this is critical for fungal health and to avoid contamination.
Harvest mushrooms when caps are compact and white (button stage) — before gills open for best shelf-life and texture.
After first flush, you can often get multiple flushes with proper care (moisture, casing, environment).