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Blue Oyster Grow Guide
Blue oysters are the ideal first mushroom — fast, forgiving, and prolific.
Difficulty
Beginner
Temperature
60–75°F
Humidity
85–95%
Fresh air
Low (heavy fresh air)
Fruiting
Cut an X in the bag face, mist 2–3× daily, and harvest in 5–7 days.
Second flush
Rehydrate the block and expect a second flush in ~10 days.
Troubleshooting
Long stems and small caps usually mean too much CO2 — add more fresh air.