How To Make A Shotgun Fruiting Chamber

Step By Step Guide To Making A Shotgun Fruiting Chamber

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What Is A Shotgun Fruiting Chamber?

A shotgun fruiting chamber is a low-cost method to keep the humidity consistently high while still providing fresh air to our mushrooms. It consists of a plastic crate covered in holes on all sides except for the lid. This is to encourage air flow. The base is lined with 3 – 5 cm of damp perlite. The increased surface area of the damp perlite will increase evaporation and therefore humidity.

SGFC Shotgun Fruiting Chamber
open a mushroom growing kit

What You'll Need

You won’t need to go further than your local hardware store to find everything you need for this project. 

When choosing a plastic crate be conscious of the size of the grow kit and that the mushroom caps may end up growing 15 to 20 cm wide.

  • Plastic Crate
  • Perlite
  • Step Drill Bit
  • Sieve
  • Marker Pen
  • Ruler

Step 1. Mark The Holes

Mark the box at 1 inch (5 cm) intervals on all sides of the crate, including the base.

Step Drill Bit
A step drill bit makes drilling holes much easier and neater.

Step 2. Drill Holes

Drill holes. Apply gentle pressure taking care not to crack the plastic. Use a small piece of tape over any cracks to avoid them spreading. The size of holes may be modified to suit fresh air requirements.

Step 3. Fill With Perlite

Soak and drain perlite. Sit plastic crate on towel as it will likely drip at first. Add perlite to the bottom of the plastic crate. It should sit 1 – 2 inches deep. 

SGFC Shotgun Fruiting Chamber

Step 4. Fill And Maintain

You’re now ready to put your fruiting block into the fruiting chamber. Open it twice daily to ensure that it’s receiving enough fresh air exchange and that the perlite remains damp. If the mushrooms are growing long and leggy it may be a sign that you need more or larger holes to increase airflow.

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We’re a small scale producer of gourmet mushroom grain spawn and ready to grow kits located in South East Queensland. We’re passionate about fungi and we love sharing our obsession with the world.

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