Button Mushroom (Agaricus bisporus)

Button Mushroom

Agaricus bisporus

Meaty caps offer earthy flavor and culinary versatility. Edible saprophytic fungus; common names: button mushroom, crimini, portobello.

Low light
2–3/week
Beginner
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Plant Needs

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Sunlight Requires low indirect light for fruiting; complete darkness allows mycelium growth but inhibits cap development
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Watering Maintain consistent moisture in growing medium; avoid overwatering to prevent mold and bacterial growth
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Temperature Optimal mycelium growth at 20–24℃; fruiting triggered by a 5–10℃ temperature drop to 12–18℃
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Characteristics

  • Fruiting Body: Young caps are round, white to light brown; mature caps flatten to 10–15 cm wide.
  • Gills: Initially pale pink, darkening to brown then black as spores mature.
  • Stem: Thick, smooth white stem with a partial veil remnant ring near the cap.
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Care Guide

Watering

Keep growing medium evenly moist; mist daily to maintain 80–90% humidity

Fertilization

No additional fertilization required; growing medium provides sufficient nutrients. Do not add synthetic fertilizers as they can harm mycelium growth

Composted spent tea leaves:Mix fully composted spent tea leaves into the growing medium before inoculation to boost organic matter content and support mycelium establishment
Pruning
  • Harvest mature caps when gills are still pale pink to prevent spore dispersal and extend fruiting cycles.
  • Remove moldy or contaminated fruiting bodies immediately to prevent spread to healthy mycelium.
  • Flush growing medium with clean, filtered water if mold appears to reset growing conditions.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic; safe for cats if ingested in small quantities

Humans: Edible when fully mature and cooked; no toxic compounds present

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Garden Uses & Culture

Culture: Symbolizes nourishment and earthy simplicity in global culinary traditions

Usage: Edible culinary mushroom; used in soups, stir-fries, grilled dishes, and as a meat substitute