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King Oyster Grow Guide
King oysters build dense stems — a little extra CO2 and top-down fruiting help.
Difficulty
Intermediate
Temperature
60–68°F
Humidity
85–90%
Fresh air
Higher CO2 for thick stems
Fruiting
Fruit from the top of the block, limit fresh air slightly for fatter stems.
Second flush
Second flushes are smaller; a fresh block gives the best yields.
Troubleshooting
Thin stems and big caps mean too much fresh air — reduce airflow.