Guide topic
Mushroom Cultivation
Plain-English, source-cited guides to growing gourmet and medicinal mushrooms.
Guide
Mushroom substrate & yield calculator
Water to add for target field-capacity moisture, plus biological efficiency and expected yield by species — free, interactive.
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Guide
Substrate hydration and field capacity
The squeeze test, target moisture by substrate, and why over-wet substrate invites contamination.
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Guide
Biological efficiency (BE)
The standard yield yardstick — the formula, typical BE by species, and why dry substrate weight is the denominator.
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Guide
Calculate substrate moisture content (% by weight)
The wet/dry formula, how much water to add for a target %, and the 60% mistake that leaves substrate too dry.
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Guide
Coco coir substrate hydration
How much water a coir brick needs, the CVG ratio, and hitting field capacity without hidden free water.
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Buying guide
The best mushroom growing supplies (2026)
substrate, spawn, still-air boxes, and the gear that actually moves yield.
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The app for this
Flush: Mushroom Cultivation Calculator
Hydration, spawn rate, agar and liquid culture, and biological efficiency — across 11 gourmet and medicinal species, with a flush-by-flush tracker. Free to download.