How To Make
The Magic Mushroom Mix

how to make fruiting blocks without Hardwood

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What Is The Magic Mushroom Mix?

Lion's Mane grown without hardwood
Blue Oyster Mushrooms

The Magic Mushroom Mix (MMM) or Equine Mushroom Mix is a highly nutritious substrate formulation suitable for producing mushroom fruiting blocks. 

We call it the magic mushroom mix because it can be used for growing a wide range of mushrooms such as oyster mushrooms & lion’s mane despite not containing hardwood.

We are currently trialling its suitability for growing species like enoki, shiitake & chestnut mushrooms.

Most fruiting blocks are produced using a hardwood based substrate whereas the MMM is free of hardwood.

Depending on the location & time hardwood fuel pellets can be expensive or difficult to locate.  The availability & price of equine supplies make them a suitable alternative.

Does Magic Mushroom Mix Need Sterilising?

Magic Mushroom Mix (MMM) is a highly supplemented substrate mix and requires sterilisation for consistent results. 

Once sterilised the substrate is extremely prone to contamination due to being both nutrient dense and without a living microbiome. Sterilised media should always be inoculated using aseptic technique. 

In the absence of a flow hood the transfers can be done in space with minimal airflow, like a bathroom for example. 

Equine Maintenance Mix

What You'll Need

To make magic mushroom mix you will need an equal weight of soy hulls and equine maintenance mix. This is to be hydrated to 60%. 

Use the following recipe to produce 2.3 kg of substrate which will be inoculated with 200 grams of grain spawn.

  • 450 grams soy hulls
  • 450 grams equine maintenance mix
  • 1.4 litres water
  • Mushroom grow bag 
  • Or Glass Jar

Step 1. Weigh Dry Ingredients

Weigh each of the dry ingredients. Mix together thoroughly before adding water.

If using a mushroom grow bag I recommend mixing the substrate directly in the bag. This recipe is ideal for filling 1 x [20x12cm] bag or 2 x [13x12cm] bags.

If using a glass jar we recommend keeping the size small due to a lack of ventilation. Ensure that a hole is placed in the lid with a micropore tape filter in place.

Soy hulls for mushroom growing
Type a mushroom grow bag fold

Step 2. Add Water

Weigh water with scales. Add water to the dry ingredients in the mushroom grow bag. Leave sit for 5 minutes to allow for the dry ingredients to absorb the water.

Now the bags are ready for folding. Learn how we fold grow bags for sterilisation in the link below.

Step 3. Sterilise

Once the substrate has begun to absorb water the grow bag can be folded over itself and packed into the pressure cooker for sterilising. 

Alternatively, if you are growing in glass jars I recommend creating a channel within each jar using the handle of a spoon. After sterilisation this channel will be be filled with grain spawn.

Sterilise the substrate for a minimum of 90 minutes. If you are using an electric bench-top pressure cooker you may need to extend cooking times.

Step 4. Inoculate With Grain Spawn

Allow the pressure cooker to depressurise naturally. Wait a minimum of 2 hours before removing the lid. Any sudden changes in temperature will result in broken grow bags.

The cooled substrate can be inoculated with grain spawn using aseptic technique. In the absence of a flow hood an enclosed space with minimal airflow should be used to undertake the grain spawn transfer.

Can I Use An Instapot?

It’s not essential to have access to a stove-top pressure cooker or canner. An instapot or electric bench-top pressure cooker can be used instead. 

An instapot will often only reach approximately 7 – 8 PSI and for this reason sterilisation times for preparing grain spawn may need to be extended by 30 minutes.

A typical instapot will fit 4 spawning jars per cycle.

View Our Range Of Grain Spawn

Who We Are

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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