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 Pearl Oyster Mushroom Grow Kit (3.5 lb)
Grows on your kitchen counter. Your first harvest in 7-10 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 fruits pearl oyster mushrooms right out of the box. Punch out the front panel, cut a small X into the inner bag, mist daily, and twist your first cluster free in 7-10 days. No soil, no grow lights and no experience required.
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. A clean, sharp blade makes a much tighter cut than tearing.
Mist daily
30 seconds a day
Place the block in a cool indoor spot with indirect light and mist the opening 2-3 times a day. Keep it evenly damp, never soaked.
Harvest
Day 7-10
Gently twist and pull your mushroom cluster free right before the caps flatten completely. Leave the block in place for the next flush. Most growers get two or three flushes from one block.
What is in the box
- One 3.5 lb fully colonised organic substrate block
- Weather-resistant 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 | Pearl Oyster (Pleurotus ostreatus) |
|---|---|
| Weight | 3.5 lbs (1.58 kg) |
| Substrate | Organic hardwood sawdust and wheat straw |
| Environment | Indoor, partial shade / indirect room light (all season) |
| Origin | Made in the USA |
| First harvest | 7-10 days after opening |
| Expected harvests | 2-3 flushes per kit |
| Shelf life | 14 days sealed in the bag |
FAQ
Questions, answered
No. This kit is designed for a kitchen counter. The block holds the moisture around the mycelium while it fruits, so a humid room and a daily mist are enough.
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.
You can, but pearl oysters prefer the more stable humidity of an indoor counter. Outdoors they fruit best in early spring and autumn.
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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