Mushroom fruiting conditions cheat sheet
Look up temperature, humidity and CO2 for 13 varieties, and enter your room temperature to see which ones fit.
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| Variety | Fruiting temperature | Humidity pins / fruiting body | CO2 | Fits your room? |
|---|---|---|---|---|
| Blue oyster | 55 to 75°F | 95-100% / 85-95% | <1,000 ppm | |
| Italian oyster | 65 to 75°F | 95-100% / 85-95% | <800 ppm | |
| Golden oyster | 65 to 80°F | 98-100% / 88-95% | <1,000 ppm | |
| Pink oyster | 70 to 80°F | 95-100% / 85-95% | 500-1,000 ppm | |
| Snow oyster | 45 to 65°F | 95-100% / 85-95% | <1,000 ppm | |
| Reishi | 65 to 80°F | 95-100% / 85-95% | Antler 20,000-40,000 ppm, fruiting body <2,000 ppm | |
| Lion's mane | 55 to 70°F | 90-95% / 80-90% | Primordia 500-700 ppm, fruiting body <1,000 ppm | |
| Black king oyster | 55 to 70°F | 90-95% / 80-90% | <800 ppm | |
| King trumpet | 50 to 65°F | 95-100% / 85-95% | High CO2 in the bag, fruiting body <2,000 ppm | |
| Chestnut | 60 to 70°F | 98-100% / 88-95% | Primordia 500-1,000 ppm, fruiting body <1,000 ppm | |
| Shiitake | 55 to 70°F | 95-100% / 85-95% | <1,000 ppm | |
| Pioppino | 55 to 65°F | 95-100% / 85-95% | <2,000 ppm | |
| Nameko | 45 to 65°F | 98-100% / 88-95% | Primordia 500-1,000 ppm, fruiting body <1,000 ppm |
How to read it
The temperature, humidity and CO2 figures are North Spore's targets for its fruiting blocks, from its instruction booklet. The humidity column gives the figure for the pin stage first and the fruiting body second, and CO2 is in parts per million. The "fits your room" column only compares your temperature with each range.
General rules from the same booklet
- Most species fruit generally at 60 to 80°F, with exceptions.
- Lower the humidity by 5 to 10% once pins form.
- Run the light on about a 12-hour timer.
- Warmer temperatures need more ventilation.
What it does not cover
These are the booklet's numbers for one seller's blocks in a fruiting chamber. A boxed kit on a counter will not hold these humidity levels, which is why North Spore suggests a humidity tent for dry rooms. For difficulty, growth time and crops, see the mushroom variety database. For the growing method, see how to grow mushrooms at home.
Related pages
Common questions
What temperature do most mushrooms fruit at?
North Spore's booklet says most species fruit generally at 60 to 80°F, with exceptions. Snow oyster and nameko are listed from 45°F, and golden oyster will not grow below 65°F.
What humidity do mushrooms need to fruit?
The booklet lists 90 to 100% at the pin stage and 80 to 95% for the fruiting body, depending on the variety. It says to lower the humidity by 5 to 10% once pins form.
What does the CO2 number mean?
It is the limit the booklet gives, in parts per million, for fresh air around the mushrooms. North Spore says high CO2 gives long stems and small caps on blue oyster.
Sources
- Fruiting Block Kit Instruction Booklet (PDF), North Spore. Checked November 11, 2026.
- Fruiting Block Kits FAQ, North Spore. Checked November 11, 2026.
How this page is checked
Cedrick Reese built this cheat sheet from the per-species table in North Spore's fruiting block booklet and checked each row against the PDF. The only thing the tool does is compare your temperature with each stated range. The figures are one seller's targets for its own blocks, and we have added nothing to them.