The Inflatable Monotub – Boomer Shroomer is the smart and compact solution for anyone who wants to grow mushrooms at home. Whether you’re just starting out or already have experience, this user-friendly system makes the process nice and simple and space-saving. Perfect for culinary varieties like oyster mushrooms or shiitake, but also suitable for more special varieties.
This patented monotub is designed with ease of use and efficiency in mind. You don’t need to build, drill or glue anything: just inflate, fill and start growing. The transparent walls give you a good view of the growth process without disturbing the environment. Thanks to the replaceable air filters and the included inner liner, you create the ideal conditions for your mushrooms. After use, you deflate it and easily slide it into the closet – convenient, right?
Key advantages at a glance:
This complete monotub set contains:
Step 1 – Preparation
Inflate the tub (±2 minutes). Clean your hands, arms and the tub thoroughly with 70% alcohol. Don’t forget the plugs either.
Step 2 – Making the mix
Mix fully colonized grain spawn with a moist substrate mix. The correct ratio is 2 parts substrate to 1 part spawn. Test the moisture: when squeezed, 1 to 2 drops of water should come out.
Step 3 – Filling
Fill the tub with the mixture, mix well and press lightly to remove air bubbles.
Step 4 – Growth phase
Let the tub sit for 7 to 14 days at a temperature of 21-24°C. The mycelium should take over about 80% of the substrate.
Step 5 – Harvesting
Replace the red plugs with the white filters. Ventilate daily for about 10 seconds. Harvest when the veil under the cap releases.
Step 6 – Restarting
For a new round, add 1-2 liters of water. Let this soak for 2 hours, drain through the drainage hole and you’re ready for the next grow. Good for 3 to 5 harvests.
Valid from Oct 21 to Nov 2, 2025
Use the code below at checkout to receive 15% off your entire order.