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King Trumpet Mushroom Grow Kit Fruiting Block
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| Skill level | Intermediate |
| Grow location | Indoors |
| Grow speed | 2 to 3 weeks |
| Shelf life | 6 months (refrigerated) |
| Kit dimensions | 6in H x 9in W x 6in D |
| Kit weight | 5 lbs |
| Fruiting temps | 50-65°F |
Our king trumpet (Pleurotus eryngii) fruiting block features a strain that produces large flushes of meaty and delicious mushrooms that are earthy, aromatic, and savory. Raw king trumpets, though dense and spongy in texture, lack aroma and flavor. But when cooked, they come to life with a soft crunchy texture and a mild savory umami flavor reminiscent of abalone.
Unlike other oyster varieties, king trumpets can be more difficult because they prefer cooler temperatures and are prone to drying out or stopping their growth if humidity is not maintained in the early stages. Additionally, king trumpets do not reliably produce second flushes, but may if temperature and humidity conditions are well controlled. Therefore, they are recommended for more advanced growers.
“5 of the Best King Oyster Mushroom Recipes”
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 king trumpet 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 king trumpet mushrooms can be found on this page under "Temp, Humidity & CO2 guide" and on page 11 of our fruiting block instruction booklet.
Preparing your block:
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.
How to initiate fruiting:
- Make a small (2-3”) cut at the top of the bag under the top seam and place upright in your fruiting chamber.
- Allow the block to pin within the bag.
- If slow to pin, place the bagged block in the refrigerator for approximately eight hours before returning to the fruiting chamber.
- Once pinning has occurred, cut off the top of the bag, leaving sidewalls approximately 4” taller than the block.
- Return to fruiting chamber until ready to harvest.
Special considerations:
King trumpet mushrooms are prone to blotch (dark spots on the fruiting bodies) with excess humidity or direct moisture.
Harvesting your mushrooms:
King trumpet mushrooms are best harvested right before the caps flatten out; good shelf life.
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 50-65°F | 10-18°C Humidity (Phase 1: Primordia) 95-100% Humidity (Phase 2: Fruitbody) 85-95% CO2 Sensitivity (Phase 1: Primordia) High CO2, keep in bag CO2 Sensitivity (Phase 2: Fruitbody) <2,000 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.
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If you don't plan to use immediately, you can refrigerate your block for up to 6 months.