How to grow your Fresh Mushroom Box
Three steps to your own organic oyster mushrooms – right in your living room, kitchen or office. Here is everything you need until harvest.
The essentials
- Remove the window, cut a large “X” into the substrate bag and gently scratch the mycelium with a fork.
- Place the box in a bright spot out of direct sunlight, ideally in the most humid room.
- Mist water behind the flaps and later onto the mushrooms twice a day.
- Harvest before the cap edges curl upwards.
Step by step to your harvest
1. Open
Push out the perforated window on the front. The substrate bag stays in the box. Cut a large “X” into the bag exactly where the window is. Do not cut off the plastic flaps. Then gently scratch the mycelium with a fork.
2. Place and mist
Put the box in a bright spot at room temperature, out of direct sunlight – ideally in the most humid room of your home. Mist a little water behind the flaps of the “X” twice a day, and later onto the growing mushrooms. If the spot is rather dry, you may need to mist more often.
3. First mushrooms
After about 2 weeks the first baby mushrooms should appear. Keep misting regularly.
4. Harvest
4–5 days later the mushrooms are ready – before the edge of the cap curls upwards. Twist or cut off the whole cluster at once.
5. Another flush
For another harvest, simply repeat steps 2 and 4. If the substrate feels dry after the first harvest or the second flush is slow to come, take the bag out of the box and lay it “X” side down in a bowl of water for 2–3 hours.
Ideal conditions
The box grows blue oyster mushrooms (a variety of the oyster mushroom, Pleurotus ostreatus). They are happy at normal room temperature – more important than the exact temperature is that the substrate doesn't dry out.
Fruiting initiation
- Temperature6–15 °C
- Humidity90–95 %
During fruiting
- Temperature10–25 °C
- Humidityabove 85 %
- Fresh air (CO₂)< 800 ppm
- Light800–1500 Lux, indirect
- Flushes2–4
Values from the book “Faszination Pilzzucht” by Sebastian Reindl (Stocker Verlag) and from our own practice at our mushroom farm in Schleedorf, Austria.
Troubleshooting
Mushrooms dry out or crack
The spot is too dry. Mist more often or move the box to a more humid room (e.g. the bathroom).
Long stems, small caps
The mushrooms lack light or fresh air. Move the box somewhere brighter (no direct sun) and air the room regularly.
No growth, or only weak growth?
Have a look at our FAQ or get in touch via our contact form – ideally with a photo. We are happy to help.
Enjoying your oyster mushrooms
Oyster mushrooms are wonderfully versatile: quickly pan-fried, breaded, in a stir-fry or as a pulled mushroom burger. Tear large caps along the gills; the firmer stem is delicious finely chopped and fried along with them.
FAQ about the Fresh Mushroom Box
How long does the box keep?
Unopened, the Fresh Mushroom Box keeps for 3 months at room temperature. The sooner you start, the stronger the mycelium grows.
How often can I harvest?
There is usually at least one more flush after the first harvest. The water bath (step 5) helps.
Where is the best spot?
Bright but without direct sun, at room temperature and as humid as possible – kitchen or bathroom are ideal. Avoid radiators and draughts.
What if nothing grows?
We guarantee a harvest or your money back. Just get in touch, ideally with a photo.
What do I do with the substrate afterwards?
The spent substrate is a valuable organic fertiliser – add it to your compost, raised bed or organic waste bin.
Want more?
Reorder directly from us, discover more mushroom species or learn how to grow mushrooms yourself in one of our courses.
Questions? FAQ · Contact · All guides
