Bulk Substrate | Williams Co Supplies
 Mycelium or your money back
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Collection: Bulk Substrate

Various ready-to-use bulk substrates, making the whole spawn to bulk process extremely easy.
Simply open up the heat sealed bag and mix with your colonised grains.
Need help calculating how much substrate you need? Here's our handy substrate calculator

12 products
  • Substr8™ High Performance Mushroom Substrate 5L
    Regular price
    £49.99
    Sale price
    £49.99
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    £49.99
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  • Pasteurised Coco Coir Mushroom Bulk Substrate
    Pasteurised Coco Coir Mushroom Bulk Substrate
    Regular price
    from £7.99
    Sale price
    from £7.99
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  • Mycelial Growth Promoter™ 60ml
    Mycelial Growth Promoter
    Regular price
    £14.99
    Sale price
    £14.99
    Regular price
    £24.99
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    per 
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  • 5LB / 2.2KG Sterilised Masters Mix Substrate | Fruiting Block
    5LB / 2.2KG Sterilised Masters Mix Substrate | Fruiting Block
    Regular price
    £29.99
    Sale price
    £29.99
    Regular price
    £29.99
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  • 5LB / 2.2KG Pasteurised Manure Mushroom Bulk Substrate
    5LB / 2.2KG Pasteurised Manure Mushroom Bulk Substrate
    Regular price
    £29.99
    Sale price
    £29.99
    Regular price
    £29.99
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  • 5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Fruiting Block
    5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Fruiting Block
    Regular price
    £29.99
    Sale price
    £29.99
    Regular price
    £29.99
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  • 5LB / 2.2KG Sterilised Master Straw Mix Substrate | Fruiting Block
    5LB / 2.2KG Sterilised Master Straw Mix Substrate | Fruiting Block
    Regular price
    £29.99
    Sale price
    £29.99
    Regular price
    £29.99
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  • Trich Stop Contamination Prevention Spray 60ml
    Trich Stop Contamination Prevention Spray
    Regular price
    £14.99
    Sale price
    £14.99
    Regular price
    £24.99
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  • Monotub Fruiting Chamber
    Monotub Fruiting Chamber
    Regular price
    from £6.99
    Sale price
    from £6.99
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  • 5L Pasteurised Coco Coir Mushroom Bulk Substrate
    Pasteurised Coco Coir Mushroom Bulk Substrate
    Regular price
    £24.99
    Sale price
    £24.99
    Regular price
    £24.99
    Unit price
    per 
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  • Exotyc™ Zoo Manure Mushroom Substrate 5L
    Regular price
    £39.99
    Sale price
    £39.99
    Regular price
    £49.99
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    per 
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  • pH Adjusted Casing Layer
    Regular price
    £11.99
    Sale price
    £11.99
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