Organic King Trumpet Mushroom Grow Kit Fruiting Block

1-Pack
$29.99

Our Certified Organic king trumpet mushroom fruiting blocks make growing your own mushrooms so easy.

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USDA Certified Organic

USDA Certified Organic

Trusted by 350K+ Growers

Trusted by 350K+ Growers

Money Back Guarantee

Money Back Guarantee

Experience the unique culinary delight of King Trumpet mushrooms right from your home with North Spore's Organic King Trumpet Mushroom Grow Kit.

This USDA Certified Organic fruiting block provides everything needed for successful indoor cultivation. Our mycologist-developed blocks are ready-to-fruit upon arrival, ensuring a straightforward growing process.

King Trumpets (Pleurotus eryngii) are celebrated for their meaty texture and earthy, savory flavor. Expect up to 0.5-2 lbs from the initial flush, with potential for multiple harvests from a single block.

Designed for intermediate growers, this kit thrives in an indoor environment. Simply follow the included instructions to create ideal conditions for robust mushroom development.

Backed by North Spore's scientific expertise and 100% Grow Guarantee, you can cultivate with confidence. Access our comprehensive guides and educational resources for support.

Begin your journey into gourmet mushroom cultivation and enjoy fresh, organic King Trumpets anytime.

Receiving and Storage

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!

Fruiting blocks should be used within 1 week of receipt. If you don't plan to use immediately, you can refrigerate your block for up to 6 months.

Growing Instructions

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.

Temp, Humidity, & C02 Guide

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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Frequently Asked Questions

Fruiting block kits are mushroom grow kits, but tend to be larger (5 lbs) and some require a bit more care depending on species. Instead of boxes, they are bagged. We recommend growing them in a fruiting chamber such as a monotub or martha tent set up like our BoomRoom. A controlled environment will produce the best results for the fruiting blocks. And, since these kits are slightly larger, they can produce more mushrooms than our Spray & Grow Kits.

Oyster mushrooms and lion's mane mushroom fruiting block kits are great for beginners because they are reliable producers and require the least amount of effort. Reishi is also great because the mushroom grows in the unopened bag (no special care or fruiting chamber required!)

All kits should grow a minimum of one flush of mushrooms, but with a little patience and skill you can often get a second or third flush depending on the species! After you’ve harvested your first flush of mushrooms, remove any growth from the block and follow these instructions:

⮕ If you have a martha tent or an automated fruiting chamber, leave the humidity and fan running and wait about 2 weeks for new pins to begin forming.

⮕ If you are using a monotub or non-autmated fruiting chamber, open 2x daily and spray blocks generously with water. Try not to expose the blocks for too long to decrease chances of contamination.

⮕ If you don't have a monotub, martha tent, or fruiting chamber cover the block with a humidity tent made from a large plastic grocery bag with LOTS of small, quarter-sized holes. Remove the humidity tent 2x daily and spray blocks generously with water.

Be patient: It's totally normal for it to take longer for mushrooms to appear with each subsequent fruiting. However, if there's no progress after two weeks, it’s a good idea to soak your block.

Soaking your block: Take your block out of the bag and soak in a bowl of cool water. Most species only need to soak for 20 minutes. However, only soak your lion's mane block for 5-10 minutes as these blocks tend to break apart if soaked for too long. After soaking, let the block drain by leaving it cut side down for another 10 minutes or tip it around to let extra water run off. You don't want to leave standing water in your bag, so pat your block dry with a towel before placing it back in the bag.

Note: Shiitake blocks should not be placed back in the bag.

For most species, you should leave the block in the bag for the entire duration of the growing cycle. However, there are some exceptions.

⮕ Shiitake should be removed from the bag before going into the fruiting chamber.

⮕ Nameko should have most of the top of the bag cut off (leaving about 4" of plastic above the block) before going into the fruiting chamber.

Our fruiting block kits are made from sawdust blocks that have been amended with substrate supplements.

Cluster of brown-capped mushrooms with long, light-colored stems against a white background.

Backed by Our 100% Grow Guarantee

Every kit comes with our 100% Guarantee: You’ll get your first flush of mushrooms, or we’ll make it right. With over 350,000 happy growers, North Spore is trusted by hobbyists, chefs, and mycologists alike.

Reviews

  • 5 stars: 21 (88%)
  • 4 stars: 2 (8%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (4%)
J
John B
Sound the Trumpets

Patiently waiting on the first flush and looking forward to the result. Pins are forming! I have them in my tent with Black Kings as well. First time trumpeter here, but excited to taste these when they're ready.

The block arrived safe and sound. Packaged well as always.

Thanks for sharing, John! Our team is here to help if you need anything.

R
Ryan K Ruff
Slow to pin, but fast to flush

Great
Good mushies

We appreciate you taking the time to share your experience, Ryan! Yes, Kings can be a bit slow to pin, but its' usually worth the wait! Please reach out if you ever need anything!

J
Jason Keene
Very good

These mushrooms are great. They were very good.

J
Jason
King trumpet

Received and appear to be high quality.

Thanks for sharing, Jason!

E
Eric Hardy
Giant mushrooms

It was so cool watching these grow!

D
Doug Horn
Great Kit!

These grew quickly and were delicious!! Thanks, North Spore!

Great photo, Doug! Thanks for sharing!

J
James Lingenfelser
Pin cushion

I had a little difficulty keeping it cool enough to get it to pin, but now it looks like a
big overladen pin cushion, with thousands of pins!

Awesome, James! We really appreciate you taking the time to share your experience.

J
Jill Humphrys
King mushroom

So far its been 10 days its not pinning. I have followed the directions and its moist. It looks good and white so i guess ill give it more time.

Thanks for sharing, Jill! Somebody from our team is reaching out to you via email now to assist you.

M
Michael Marmon
Not prepared….

Ordering , shipping , and receiving was all good . Definitely a little trickery to work with . I didn’t realize the growth requirements is where to me , I have slightly failed . Temperature was one aspect and CO2 was another . I have a grow tent in my garage which temps are cooler . I placed a jug of egg shells and vinegar (making material for organic gardening) which is producing CO2 . Have little pins starting to form now . Have strawberry starts in pots which hoping hold some humidity to the senario . Wanted to try these because the do taste real good but guess , should have done some home work and been a little more prepared . Still hopeful will get something going , not giving up yet . It’s all a learning experience .

Thanks for sharing, Michael! We really appreciate your support. If you need help with anything, please reach out!

J
Jon Knight
May have to update this review....

I may have to update this review later, but for now it's been a mixed result. I got King Trumpets to try an intermediate species grow for the first time. After following the directions for setup, I ended up putting it in the refrigerator for 8hr like the directions say and then put back into the Monotub chamber. At this moment however it has yet to start pinning, but hopefully soon it will. The reason for the 5-stars is the customer service! North Spore doesn't just sell and run away from questions. They want to help and have been a constant reliable source for information and assistance! Fingers crossed for some trumpet success!

Thanks for sharing, Jon! The team is here to help if you need anything!

V
Vickie

I've grown these before. Directions never said to tent it for moisture like other vendors would.. it never grew..

A
Anthony

Very fun product, will order again

L
Leslie

Bought as a gift and she is loving watching them grow!

H
Heather Potash
Great quality

I Adore these mushrooms! I had to do the extra cold shock in the fridge to initiate pinning but got beautiful results

T
Terri Tokutomi
Delicious

So fun! Yummy! I really enjoyed growing and eating them!

T
Todd Sheppard
King Trumpets

These are some super sized mushrooms. Really enjoying growing them. Hoping they taste as good as they smell!

S
Steven

Awesome products

B
Brian Kelly Wilkins

So far so good

L
Lauren B
You can do this.. it’s fun

I attempted the King trumpets and it’s been a little more challenging as they take longer to pin than my oysters did. However once you get them going and keep the humidity right they grow beautifully! I just love mushrooms! Give it a shot you won’t be disappointed

M
Michael J Kalafut
An Exciting Propitious Beginning For Outdoor Morel Season

I Really Enjoyed Growing & Eating these Trumpet Mushrooms : ) !!!
They were the Perfect Prelude to Upcoming Late Spring Morel Season in Central Oregon.
I'm letting the bag Rest right now, after a Great Flush and Will try a Second propagation in a week or so ...
Great Company, Great Product : ) !!!

T
Tim
So far so good

As of right now the mushrooms are all pinned out and looking good. When I fist got the block it was covered on all sides with healthy looking mycelium. After maybe about a week or so the pins began to form and are still looking healthy. My only critique would be that the directions at least to me were slightly confusing when it came to how I was supposed to cut the bag when I had pins. Maybe a picture that demonstrates this a little better would be helpful. Other than that totally satisfied!

B
Bethany M Clarke
Our new bathroom decoration is edible :-)

We were nervous about growing this mushroom as it's supposed to be one of the more difficult ones plus we'd ordered mushroom spores from a different company and they failed. So, we put these mushrooms on a shelf in our bathroom (for humidity) and to our surprise, they grew like crazy. We've had them in several dishes and really enjoyed them. Thanks Nothern Spore!

S
SHEREEN W CROWLEY
A gorgeous mushroom and super tasty

Even though I live in a warm area (Georgia)and this mushroom does best in cooler temperatures, it was Nov. so I decided to give it go. The setup is easy, open the top of the bag and put it in a place that is cool and doesn't get much sun. I made sure it was slightly damp (easy enough if you keep a spray bottle near) . It only took about a week to see little bumples (not a scientific term so don't look it up), I just kept watching and yesterday (3 1/2 weeks since I opened the bag) I pulled a beautiful group of mushrooms. Made soup last night and let me tell you, this mushroom is like a cross between a portabello and a button. Meaty, white stems. I love it and I am just continuing to spritz the inside of the bag and look for more. Could not be happier with this mushroom.

D
Daniel Lee
No need to be nervous!!!

I had got the lions mane first and it was not a bad grow ! So I jumped in head first with the King Trumpet grow kit! I was nervous about it but I’m glad I did it, there turning out great! And a whole lot of fun doing it. Thank you!!!
Daniel Lee