How to Grow Button Mushroom
Wikimedia Commons
Button Mushroom
Agaricus bisporus
vegetableButton mushrooms are the most commonly cultivated edible fungi in the world, characterized by their small, rounded caps that range from white to brown depending on variety. They are grown on composted substrate rather than soil and can be cultivated indoors year-round. The brown variety is known as cremini or chestnut mushroom, while fully matured specimens are called portobello.
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Example Button Mushroom timeline · Pittsburgh, PA (Zone 6b)
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Plant Button Mushroom
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Button Mushroom
Around May 1≈ 14 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Button Mushroom dates for your own zip code.
Growing Conditions
Soil
Growth Stages
Spawn Run
10-14 daysWhite mycelial threads colonize the composted substrate, visible as fine white webbing throughout the medium
Maintain 55-65°F temperature, high humidity (80%+), gentle air exchange. Keep substrate moist. This stage takes 10-14 days.
Pinning
3-7 daysTiny mushroom primordia (pins) appear as miniature bumps on the substrate surface, triggered by fresh air exchange and light exposure
Increase fresh air exchanges to 4-6 times daily, introduce indirect light (12 hours/day), maintain 55-65°F and 85-95% humidity. Mist 2-3 times daily.
Fruiting Body Development
5-7 daysPins rapidly expand into recognizable mushrooms with developing caps and stems; button stage has closed veils
Continue high humidity (90%+) and frequent misting. Increase fresh air to 6 exchanges daily. Maintain 55-65°F. Reduce light to prevent overheating.
Harvest Ready
3-5 daysMushrooms reach market size with closed or slightly opened veils (button stage). Brown varieties (cremini) are darker; white buttons are pale. Cap diameter typically 1-2 inches.
Harvest before veil breaks or mushrooms begin flattening. Gently twist and pull at base. Clean knife or scissors for harvest.
Flush Completion & Reset
7-10 days between flushesAfter harvest, allow 7-10 days of rest before substrate regenerates for second flush. Quality typically decreases with subsequent flushes.
Remove all mushroom debris. Stop misting, reduce humidity to 70%. Maintain lower temperature (50-55°F). Resume misting for second pin set.
Companion Planting
Plan your garden →Common Pests
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Reduce humidity to 70% immediately, increase ventilation to 8+ air exchanges daily, remove affected substrate sections, maintain 60°F temperature to slow mold growth
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Increase temperature to 70°F and improve ventilation, apply lime water spray (1 tbsp hydrated lime per gallon), remove contaminated substrate entirely, sterilize all equipment
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Reduce humidity to 80% during non-fruiting, improve ventilation, use sticky traps near growing area, cover substrate between flushes with damp cloth, introduce beneficial nematodes (Steinernema feltiae)
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Drastically increase air exchange to 10+ per day, lower humidity to 80%, increase temperature to 68°F, remove affected mushrooms, disinfect all surfaces with 10% bleach solution
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Maintain 90%+ humidity and 60°F, increase air exchanges to 8+ daily, apply sulfur dust to substrate surface, remove affected mushrooms immediately with surrounding substrate
Uses
Fresh Cooking & Culinary Staple
CulinaryButton mushrooms are versatile in kitchens worldwide, used raw in salads, sautéed as side dishes, in soups, stir-fries, and pasta dishes. They have a mild, earthy flavor that complements virtually any cuisine. [source]
Immune Support & Ergothioneine
MedicinalButton mushrooms contain polysaccharides and ergothioneine, a powerful antioxidant amino acid that may support immune function and reduce oxidative stress. [source]
Vitamin D Production
HouseholdWhen exposed to sunlight (especially UV-B), button mushrooms produce vitamin D2, providing a plant-based vitamin D source when blanched or dried. [source]
Umami Flavor & Glutamates
CulinaryMushrooms contain natural glutamates and nucleotides that provide umami (savory) flavor, enhancing dishes and potentially reducing salt requirements in recipes. [source]
Anti-inflammatory Properties
MedicinalButton mushrooms contain compounds like lentinan and beta-glucans that may support anti-inflammatory responses and overall wellness when consumed regularly. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest button mushrooms when the veil (membrane connecting cap to stem) is still intact and intact, typically at 1-2 inches diameter. Gently grasp the base and twist counterclockwise while pulling upward, or cut cleanly at substrate level with a sterile knife. Harvest before the veil breaks, as this marks the cremini/portobello transition. Morning harvest is best when moisture levels are high. Handle carefully to avoid bruising.
Fun Facts
- 🌱 Button mushrooms are 92% water by weight, making them extremely low in calories while nutrient-dense—a serving contains more potassium than a banana.
- 🌱 A single button mushroom can release up to 16 million spores, which is why contamination control and sterilization are absolutely critical in mushroom cultivation.
- 🌱 Button, cremini, and portobello mushrooms are all the same species (Agaricus bisporus) at different maturity stages—cremini is the brown variety harvested early, while portobello is allowed to mature fully with opened gills.
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