Sterile Substrate | Williams Co Supplies
 30 Day Money Back Guarantee
 FREE Delivery on orders over £59
 Pay with Klarna

Collection: Sterile Substrate

Discover our range of ready-to-use bulk mushroom substrates, designed to simplify the spawn to bulk process. Just open the heat-sealed bag and mix with your colonised grains for effortless mushroom cultivation. Perfect for growers of all levels, our bulk substrates ensure an easy and productive growing experience.

10 products
  • Substr8™ High Performance Substrate For Exotic Mushrooms & Therapeutic Species
    Regular price
    from £39.99
    Sale price
    from £39.99
    Regular price
    Unit price
    per 
    Sold out
  • 2.5KG Coco Coir CVG Fruiting Substrate For Exotic Mushrooms & Therapeutic Species
    Pasteurised Coco Coir Mushroom Bulk Substrate
    Regular price
    £24.99
    Sale price
    £24.99
    Regular price
    Unit price
    per 
    Sold out
  • 5LB / 2.2KG Pasteurised Manure Mushroom Bulk Substrate
    5LB / 2.2KG Pasteurised Manure Mushroom Bulk Substrate
    Regular price
    £19.99
    Sale price
    £19.99
    Regular price
    Unit price
    per 
    Sold out
  • Mycelial Growth Promoter™ 60ml
    Mycelial Growth Promoter
    Regular price
    £9.99
    Sale price
    £9.99
    Regular price
    £14.99
    Unit price
    per 
    Sold out
  • Exotyc™ Zoo Manure Mushroom Substrate
    Regular price
    from £39.99
    Sale price
    from £39.99
    Regular price
    Unit price
    per 
    Sold out
  • 5LB / 2.2KG Sterilised Masters Mix Substrate | Mushroom Fruiting Block
    5LB / 2.2KG Sterilised Masters Mix Substrate | Fruiting Block
    Regular price
    £19.99
    Sale price
    £19.99
    Regular price
    £29.99
    Unit price
    per 
    Sold out
  • 5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Mushroom Fruiting Block
    5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Fruiting Block
    Regular price
    £19.99
    Sale price
    £19.99
    Regular price
    £29.99
    Unit price
    per 
    Sold out
  • 5LB / 2.2KG Sterilised Master Straw Mix Substrate | Mushroom Fruiting Block
    5LB / 2.2KG Sterilised Master Straw Mix Substrate | Fruiting Block
    Regular price
    £19.99
    Sale price
    £19.99
    Regular price
    £29.99
    Unit price
    per 
    Sold out
  • pH Adjusted Casing Layer
    Regular price
    £11.99
    Sale price
    £11.99
    Regular price
    Unit price
    per 
    Sold out
  • Substr8™ Inject & Forget Growing Kit For Exotic Mushroom & Therapeutic Species | 1KG
    Regular price
    £24.99
    Sale price
    £24.99
    Regular price
    £29.99
    Unit price
    per 
    Sold out