Masters Mix - 4kg Sterilised Mushroom Substrate Bag

• 4kg Substrate Mix
• Blend Of Hardwood & Soy
• Space For 500g Of Spawn
• XLS-A Unicorn Bag
• For Spawn To Substrate Growth
• Autoclaved For 1 Hour 30 Minutes
• Sealed In Cleanroom
• How To Guide Included

Our pre-sterilised Masters Mix substrate bags are ideal for growing gourmet and functional mushroom species. This master mix of Hardwood and Soy will create the perfect environment for your mycelium. We test optimal field capacity on every batch, so your fungi strains will enjoy a perfect moisture level that boosts yields. 

All of our substrates are sterilised in our medical-grade autoclave for 1 hour and 30 minutes, with at least a pressure of 15 PSI. This gives our blocks enough time at a minimum of 121ºC to reach the centre of the bag, ensuring all microorganisms are killed off. We then open the autoclave inside our cleanroom and heat seal the mushroom grow bag in front of a laminar flow hood to stop any contaminants getting in.   

• 4kg Masters Mix Substrate In An XLS-A Unicorn Bag

• Grain Spawn
• Aseptic Technique Kit
• Misting Bottle

To get started with this kit (using aseptic technique) cut along the top of the bag and add up to 500g of colonised grain spawn inside. Then seal the block back up using either a zip tie or heat sealer. To finish off, mix the spawn and substrate evenly before popping your block in ideal growing conditions for colonisation. From there you can simply leave the rest of the work to the mycelium! Check out our how to use your substrate guidefor more detailed advice.