First flush was huge
Opened the bag, set it in my garden bed and had pink oyster mushrooms in under three weeks. The block smelled clean, nothing mouldy, and the instructions were spot on.
GrowWithMushroom
Organic Lion's Mane Mushroom Grow Kit (3.5 lb)
A dense cascading cluster on your counter in 10-14 days.
$35.99$45.99Save 22%
Grown in the USA
Small-batch, Pacific Northwest facility
Free replacements
Damaged or contaminated? We reship it
Third-party lab tested
Heavy metals and microbial screen
Ships in 2 business days
Free over $199
Verified reviews
What growers say
Real photos, real harvests, real first flushes. Every review below comes from a customer who grew the block themselves.
4.7
Based on 6 verified grows
Verified buyers
Real harvest photos
90-day guarantee
Zero grow room, zero experience
I have never grown anything before. The block came fully colonised and all I had to do was cut the bag and keep it damp. Got a full basket in 20 days.
Great block, one slow week
Quality was obvious and my second flush was generous. It took me a little longer than the card said because my apartment runs cold, but the support team answered the same day.
The packaging is the packaging
Everything arrived cold and intact, sealed in a breathable bag with a clear window so I could see the mycelium was alive. That detail sold me.
My kids check on it every day
It is genuinely fun to watch. The caps are bright pink and fluffy, and the second flush was almost as big as the first. We have ordered two more.
Excellent, but read the humidity note
Healthy block, clean substrate, no contamination. I kept it outside where it was too dry for a week, and they told me exactly how to fix it with a simple tub. Second attempt was perfect.
No reviews match that rating yet.
The short version
A 3.5 lb pre-colonised organic substrate block that produces a dense, cascading cluster of lion's mane mushrooms in a humid bin on your counter. Open the front panel, mist daily, and cut your first cluster in 10-14 days.
Why grow with us
Grown in the USA
Small-batch, Pacific Northwest facility
Free replacements
Damaged or contaminated? We reship it
Third-party lab tested
Heavy metals and microbial screen
Ships in 2 business days
Free over $199
Watch it grow
From block to harvest in 3D
Scrub the timeline and see exactly what is happening inside the block, day by day.
Day 1
Day 7
Day 1
Day 1
The block arrives alive
Your substrate is already fully colonised with white mycelium. There is nothing to inoculate and nothing to sterilise - open the bag and move on.
Room temp 65-70F
Light Indirect
Humidity Sealed
Watch it happen
Videos from real growers
Unboxing, planting and harvest footage shot on our own blocks.
How to grow it
Step by step, no guesswork
Open the panel
1 minute
Punch out the front panel and cut a small X into the inner substrate bag. Do not remove the liner - it holds humidity around the cluster.
Mist and cover
30 seconds a day
Mist the opening lightly, fold the bag back over the block and keep the humidity high. Lion's mane likes a humid bin with a little fresh air.
Harvest
Day 10-14
Cut the cluster at the base with a clean knife when the spines are still slightly soft and the whole mass is a single piece. Wait a few extra days if you want the classic dense pom-pom rather than a loose spray.
What is in the box
- One 3.5 lb fully colonised organic substrate block
- Resistive humidity bag liner
- Step-by-step instruction card
- Access to our grow support team
Certificate of Analysis
Lab verifiedNorthwest Analytical Labs · Batch GWM-26-0814 · Tested 2026-08-14
Lead (Pb)
<0.05 ppm
Cadmium (Cd)
<0.02 ppm
Mercury (Hg)
<0.01 ppm
Total plate count
<1,000 CFU/g
Yeast and mould
<100 CFU/g
Specifications
| Variety | Lion's Mane (Hericium erinaceus) |
|---|---|
| Weight | 3.5 lbs (1.58 kg) |
| Substrate | Organic hardwood sawdust, wheat straw and rye grain |
| Environment | Indoor, partial shade / indirect room light (all season) |
| Origin | Made in the USA |
| First harvest | 10-14 days after opening |
| Expected harvests | 2-3 flushes per kit |
| Humidity | 85-95% recommended |
| Shelf life | 14 days sealed in the bag |
FAQ
Questions, answered
No. A plastic bin with a loose lid and a daily mist is enough. The bag liner the kit ships with does most of the humidity work for you.
Mild and faintly sweet, with a texture like a firm seafood. It is the only mushroom you really cook - sear it hard in a hot pan and finish with butter.
Yes. Every block is lab tested for heavy metals, microbial load and yeast and mould before it ships, and the Certificate of Analysis for your batch is published on this page.
Contact us within 30 days with a photo and your order number and we will ship a free replacement. We have never had to refuse a replacement request.
Our promise
If it does not grow, we replace it
Mushroom growing depends on temperature, humidity and a little bit of luck. If our block fails, that is on us, so we send another one. We have never refused a replacement request.
Read the guaranteeShips within 2 business days
Packed in breathable mycelium bags with insulation, so your block arrives alive and colonised.
90-day grow guarantee
If it does not fruit, send us a photo and we ship a replacement. Free, no questions, no return needed.
Third-party lab tested
Every batch screened for heavy metals, pathogens and microbial load. Certificate of Analysis published.
Real mycologists on support
Send a photo of your grow and get a specific answer from someone who has run thousands of blocks.
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