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Blue Oyster Mushroom Grow Kit Fruiting Block
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| Skill level | Beginner |
| Grow location | Indoors |
| Grow speed | 1 to 2 weeks |
| Shelf life | 6 months (refrigerated) |
| Kit dimensions | 6in H x 9in W x 6in D |
| Kit weight | 5 lbs |
| Fruiting temps | 55-75°F |
Our blue oyster (Pleurotus ostreatus) fruiting block features a strain that produces beautiful clusters of mushrooms with bluish-gray to brownish-gray caps, depending on lighting conditions. They have a rich umami flavor and a soft meaty texture that lends itself to most recipes.
Blue oyster mushrooms are great for beginners as they are reliable producers and tend to grow large flushes. They are also one of the easiest blocks to get subsequent fruitings and, if kept in the right conditions, should reliably produce a second flush or more!
Upon receiving your kit:
Remove kit from the shipping box as soon as possible. Then, unfold the top of the bag, making room for air space. It's also important to check and confirm that the filter patch is not obstructed. This will help the organism breathe and continue to thrive until you are ready to grow your fruiting block!
Scroll down for guides on growing, storage, cooking, and more.
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For the majority of mushroom species, all that is needed to initiate fruiting (or begin the growth cycle) is a change in environmental conditions -- specifically humidity, light, temperature, and changes to oxygen and CO2 levels.
For best results:
We recommend growing your blue oyster block in a fruiting chamber (like a monotub or martha tent) as a controlled environment will decrease the risk of contamination and increase the chances of success.
Creating optimal conditions:
The environmental parameters for blue oyster mushrooms can be found on this page under "Temp, Humidity & CO2 guide" and on page 3 of our fruiting block instruction booklet.
Preparing your block:
Tightly fold excess plastic back and place the block face up.
How to initiate fruiting:
- Slice bag with a single diagonal line or with an X.
- Blue oyster mushrooms can be top or side fruited.
Special considerations:
- Blue oyster mushrooms are prone to forming long stems and small caps when CO2 levels are too high.
- Cooler temperatures and more light will produce a more pigmented cap.
Harvesting your mushrooms:
Harvest young, when edges of caps are still slightly turned under. (When harvested younger, less spores will be produced and shelf life will be extended.) Remove entire cluster with care to minimize breaking.
Growing different blocks together:
With some compromise, many different species of mushrooms can be grown together in a fruiting chamber. First, consider the temperature range of the mushrooms you desire to grow, and second, the CO2 sensitivity. Humidity ranges overlap for the majority of species. We encourage you to experiment with many different groupings!
Troubleshooting:
Having issues with unusual growth, stunted growth, or no growth at all? Refer to pages 16-18 in our fruiting block instruction booklet.
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Temperature 55-75°F | 13-24°C Humidity (Phase 1: Primordia) 95-100% Humidity (Phase 2: Fruitbody) 85-95% CO2 Sensitivity (Phase 1: Primordia) <1,000 ppm CO2 Sensitivity (Phase 2: Fruitbody) <1,000 ppm - Primordia - The earliest recognizable stage of fruitbody development. Also known as “baby mushrooms” or “mushroom pins.”
- Fruitbody - A fully grown mushroom, the reproductive structure of the organism in which the spores are produced.
- CO2 sensitivity - When CO2 levels are too high, yields will decrease, stems will become long and stringy, caps will be small, and/or growth will halt.