Select Page

How To Make A Fruiting Chamber

This is what we are going to be making:

Why Make A Fruiting Chamber?

Before I show you how to make a fruiting chamber lets discuss why you might want to make one in the first place. A fruiting chamber allows for gas exchange but it also allows for a lot more space than using a tent type set-up. This is good for a number of reasons. If your fruiting cakes you can take multiple cakes in the same box with a layer of perlite at the bottom. If your wanting to take some colonised grain and fruit a larger amount of mushrooms you could mix your colonised grain with more substrate in your chamber and end up with a lot more mushrooms. I like the fact that it is easier to mist and fan your mushrooms in the container as well (I use the lid for the fanning part).

For the small cost and effort taken it is well worth making a fruiting chamber so let’s begin.

Time To Make Your Fruiting Chamber

First of all you are going to need a plastic storage box like this:


 You can pick these up in any home store, hardware store and super market – just about anywhere.

My fruiting chamber in the title image is:

– length: 48 cm/ 19 inches

– width: 38 cm/ 15 inches

– height: 29 cm/ 4 inches

And about 35 Litres/ 37 Quarts capacity.

You will also need some polywool (to act as a filter for gas exchange) and a drill (to make your holes – hence why it is sometimes referred to as a shotgun fruiting chamber). The Polywool is often sold in pet stores as it is used for aquariums. 

Take a marker pen and mark out where you are going to put your holes. You don’t need to be too precious about this, but, I like things to look neat and tidy so I measured the holes at 5 cm/ 2 inches apart. As you will see from my fruiting chamber you don’t want to start the holes too low as you will have either perlite or substrate in the bottom anyway so best to keep it water tight lower down. My holes start at 10cm/ 4 inches from the bottom.

Once you have marked out where you want your holes I would advise starting with the smallest drill-bit you have to make your initial holes. I would then work your way up to 6 mm drill bit for your final holes incrementally. The reason for this is, depending on the quality of the plastic in your storage container, the plastic can easily crack if your too aggressive with the size of your drill bit. It is worth taking your time and doing it right as it will take a lot more time and extra expense to go and buy an extra storage container. Don’t say I didn’t warn you!

Once you have made all your holes its just a case of filling those holes with polywool. Take a large enough amount that when you pull the polywool through the hole you get a snug fit.

And there we go! You now have yourself your very own fruiting chamber.

Happy Mushrooming!