Organic Golden Oyster Mushroom Grow Kit (3.5 lb)
A 3.5 lb pre-colonised organic substrate block that grows golden oyster mushrooms - vivid canary-yellow clusters with a rich, nutty flavour that grocery stores rarely carry.
The short version
A 3.5 lb pre-colonised organic substrate block that grows golden oyster mushrooms - vivid canary-yellow clusters with a rich, nutty flavour that grocery stores rarely carry. Open the front panel, mist daily and harvest your first bouquet in 7-10 days.
Why grow with us
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 0
Colonisation
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.
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. Golden oysters bruise easily, so handle the cluster only once it is ready.
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. Golden oyster caps are delicate - cut rather than tear when you can.
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
Specifications
| Variety | Golden Oyster (Pleurotus citrinopileatus) |
|---|---|
| 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
Verified reviews
What growers say
Reviews from customers who harvested their own mushrooms.
First harvest in nine days
“Bought this as a total beginner and had a full cluster on my counter a week and a half later. The instructions were actually clear.”
Way more than I expected
“The block is heavy and arrived properly colonised. Two flushes so far and the second one was bigger than the first.”
Great, but read the humidity notes
“Support replied the same day with a humidity tip and it solved it. Cluster looked exactly like the photos on the product page.”
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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