15 minutes to set it up, 3 to 5 weeks to watch your blue oyster mushrooms grow. A family activity that ends on your plate.
- Everything included: straw ready to hydrate, live mycelium, grow bag and illustrated instructions.
- Then the mycelium does the work. Once the bag is opened, 1 to 3 mistings a day are enough. Up to 3 harvests.
- Hand-prepared in our workshop in the canton of Fribourg, from our own strains.
Free shipping until 18 October · Ships within 2 to 3 days · Live mycelium: start within 7 days of delivery
Every photo on this page is real: our kits, our cultures and those of our customers.
How it works
- Prepare (day 1, about 15 minutes). Pour 1.2 L of lukewarm water into the straw bag, let it soak for 5 minutes, add the mycelium and mix by kneading the bag.
- Let it colonise (2 to 3 weeks). The white mycelium spreads through the straw day by day. A show to follow as a family.
- Open and mist. When the straw is completely white, open the bag on the side and keep the opening well humid.
- Harvest (1 to 3 weeks later). The blue oyster mushrooms appear. Pick them just before the caps turn upwards, then cook them. Up to 3 harvests.
What's in the kit
- 750 g straw pellets with 2% lime
- 200 g blue oyster mushroom grain spawn
- A grow bag with filter
- Illustrated instructions
You will need: 1.2 L of lukewarm water and a spray bottle. No spray bottle? A plate and a damp towel will do.
Detailed instructions
1. Prepare your workspace. Wash your hands and clean the work surface. Cleanliness is the key to success.
2. Hydrate. Pour 1.2 L of lukewarm water into the bag containing the straw and let it soak for 5 minutes. Target: 60 to 65% moisture.
3. Inoculate. Add the 200 g of mycelium, close the bag and knead gently to spread it evenly.
4. Incubate. Keep the bag at around 20 °C, away from direct light, for 2 to 3 weeks, until the straw is completely white.
5. Open and humidify. Press out the air, open the bag 5 to 10 cm on the side, then keep humidity high: 1 to 3 mistings a day, or a plate and a damp towel.
6. Harvest. The mushrooms appear 1 to 3 weeks after opening. Harvest them just before the caps turn upwards.
Tips: avoid direct sunlight and draughts, and keep humidity steady after opening.
Shipping and freshness
- Free shipping until 18 October 2026.
- Ships within 2 to 3 days, to Switzerland only.
- The mycelium is alive: start your culture within 7 days of delivery.
- Every kit is checked before shipping and its batch is traceable. If the kit arrives damaged, send us a photo and the batch number within 14 days: replacement or refund.
FAQ
Do the mushrooms stay blue?
The blue is most intense on young mushrooms. It softens to blue-grey as they grow and disappears when cooked.
Do I need much space?
No. A corner of the kitchen or a shelf is enough: indoors, around 20 °C, away from direct sunlight and draughts.
How many harvests?
1 to 3 depending on conditions, sometimes more.
What if nothing grows?
Every kit is checked before shipping. Success then mainly depends on three things: starting within 7 days, working cleanly and keeping humidity steady after opening. Unsure along the way? Send us a photo and we will help.
Is it a good gift?
Yes, as long as you give it quickly: the mycelium must be started within 7 days of delivery. The easiest way is to have it shipped directly to the recipient.
Can children take part?
Yes, with an adult: mixing, observing, misting, harvesting. Precautions regarding the lime are listed under Safety.
For teachers
Want to grow mushrooms in class? On request, we prepare teaching materials adapted to your grade level (in French), for example: the mushroom life cycle, observation sheets, activity plans. Contact us to discuss it.
Safety
- The straw contains a little lime, which can irritate skin and mucous membranes: avoid contact and do not touch your face. In case of contact, rinse thoroughly with clean water, immediately for the eyes.
- The grain spawn is not edible. Only the harvested mushrooms are to be eaten, well cooked.
- Children handle the kit under adult supervision.
