Organic Shiitake Mushroom Grow Kit Fruiting Block
|Grow speed||1.5 to 2 weeks|
|Kit shelf life||6 months (refrigerated)|
|Kit dimensions||6in H x 9in W x 6in D|
|Kit weight||5 lbs|
Our Shiitake (Lentinula edodes) fruiting block features a popular strain that produces light brown, medium-to-large, umbrella-shaped caps. Shiitake mushrooms are a delicious edible fungus from East Asia and their flavor is described as rich, savory, buttery, and umami. This strain tends to produce generous flushes, making them a great mushroom for confident beginners and intermediate growers.
Shiitake are reliable producers as long as the ambient humidity in the growing environment remains consistent. Because the block is removed entirely from the bag once it's ready to fruit, shiitake blocks are prone to drying out. Therefore, we recommend using a humidity tent or humidity-controlled fruiting chamber (like a monotub or martha tent) to help mitigate the moisture issue.
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.
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 shiitake 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 shiitake can be found on this page under "Temp, Humidity & CO2 guide" and on page 13 of our fruiting block instruction booklet.
Preparing your block:
Your shiitake block should be given time to brown in its bag at room temperature before fruiting is initiated.
How to initiate fruiting:
- Once the block is mostly brown, place the sealed block in the refrigerator for at least 48 hours.
- Next, remove the block from the bag and soak the block in cold water for approximately 4 hours before placing it directly into your fruiting chamber.
- DO NOT place back into the bag, as shiitake blocks grow without a bag.
Shiitake can be prone to Trichoderma (green mold). If you see green mold, spray affected areas of block with hydrogen peroxide 3%.
Harvesting your mushrooms:
Harvest your shiitake block just before the caps flatten. Trim flush with the block so no stem remains on the block before subsequent fruitings. Place block back into fruiting chamber between fruitings to prevent it from drying out and to decrease risk of contamination.
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!
Having issues with unusual growth, stunted growth, or no growth at all? Refer to pages 16-18 of our fruiting block instruction booklet.
Temperature 55-70°F | 13-21°C Humidity (Phase 1: Primordia) 95-100% Humidity (Phase 2: Fruitbody) 85-95% CO2 Sensitivity (Phase 1: Primordia) 500-700 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.
If you don't plan to use immediately, you can refrigerate your block for up to 6 months.
Shiitake has a meaty texture when cooked and is good for drying and reconstituting in winter soups. It pairs beautifully with tamari, ginger, and garlic and can bring needed umami to many different dishes. These mushrooms are delicious sauteed and can be used in stir-fries, risottos, ramens, on pizzas, or simply eaten by themselves.
If you’re going to consume home-grown mushrooms, make sure to cook your fresh mushrooms thoroughly with heat. If it is your first time eating this species, it is best to start with a small amount to check for allergies, even if cooked.
Mushrooms grow spores as they develop. This is a natural means of reproduction. This is when people with allergies or compromised immune systems may want to consider putting fruiting mushroom kits outdoors or in a well-ventilated area. Spores in mushrooms sometimes cause respiratory irritation. In rare cases, spores may also cause irritation for some non-allergic or non-immunocompromised mushroom growers. If you are one of them, it is recommended to reduce the overall spore load by harvesting mushrooms while they are still in their younger growth stages.
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Shiitake fruiting block
The block is growing shiitake very well. I have harvested several mushrooms so far and should have a few more this weekend. They taste excellent too. I am hoping for a second fruiting later on. A fun project. I had a problem with the first order when i discovered an open seam in the packaging when I received it and you immediately sent me another fruiting block. The first block actually produced several mushrooms and is now barren and very dark color. I am hoping it will produce again. I appreciate your excellent customer service.
Thanks for sharing, Robert! We appreciate you taking the time to share your experience.
Shitaki blocks are the easiest and best on the market!
I waited until the skin on the mycelium was brown, open it up in a fruiting box, and so many mushrooms!!
Thanks for sharing, Siobhan! We’re so happy you’re enjoying the experience.
We received a 4 pound harvest from the first flush on the 3 grow blocks. The second flush was much lighter, but overall a fantastic grow.
Thanks for sharing, Chris! If you need help with anything, please reach out.
This was my first attempt at growing mushrooms. I received the three shiitake fruiting blocks on the buy two, get one free sale. I also received my subscription order on the same day with golden oyster, pink oyster and king trumpet blocks. Once I placed the blocks in fruiting chambers, I regularly contacted customer support. They were great! I lost the first flush of golden oysters due to environmental conditions. With the help of customer support, I had my first harvest of shiitake mushrooms. I got 2.25 lbs from the three blocks. This has been an amazing experience, and now I feel more confident in growing mushrooms. I look forward to seeing if I can get a second flush from the shiitake blocks, and for my next subscription order to arrive. North Spore is awesome!
Your review made our day, Susan! The team is here to help if you ever need anything.
So far it’s going really well, I had a little mold spot but I’m a beginner and I think it’s totally my fault sprayed a little 70% alcohol to get rid of it. Love the lionsmane grow kit. Can’t wait to buy more with my birthday money! Definitely recommend
Just do it, North Spore makes it easy.
Having never delved into the world of mushroom cultivation, I was first a bit intimidated by the Shitakes. I shouldn't have worried, the fruiting block from North Spore Has produced like a champ. Being my first grow, I didn't want to spend a lot of money and made my own shot gun fruiting chamber from things I already had. In short, despite probably less than perfect fruiting conditions, I got a beautiful first flush and am looking forward to a second or even third.
first time grower
well im not sure, i purchased the grow tent and followed the guidelines but very little activity on the mushrooms. Giving you a 3 cuz don't know whats going to happen
Hi Michele, We would love to help! We have live chat on the site M-F from 9am-4pm ET. Someone on the team can help you troubleshoot what may have gone wrong!