5LB / 2.2KG Sterilised Supplemented Hardwood Mushroom Substrate | Fruiting Block | Williams Co Supplies
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5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Fruiting Block

5LB / 2.2KG Sterilised Supplemented Hardwood Substrate | Fruiting Block

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 Ready to use
 85% Oak Hardwood 15% Wheat Bran
 5lb / 2.2kg per bag
 Sterilised & Contaminant Free
Backed by our 30 day money back guarantee
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Perfect for all wood-loving mushroom species including Reishi, Maitake, Shiitake, Lions Mane & Oysters!

We have seen great harvests of all Oyster & Agaricus species using this substrate. 

We make the masters mix fruiting blocks by first mixing 85% oak hardwood and 15% wheat bran (with a couple of extra secret ingredients) and hydrating them to the correct moisture content. We then load each heavy-duty grow bag with the mix, heat seal them and sterilise at 15psi for 120 minutes in our commercial autoclave.

We take great pride in our attention to detail and techniques ensuring you will receive nothing but the best possible product.


  • Open the sealed bag and mix with colonised grains at your chosen ratio

Bulk Ordering

We provide cash-on-delivery options for orders exceeding 150 items, which may consist of a combination of grain and substrate. Our delivery services are available nationwide. Please contact us via support@williamscosupplies.com to arrange delivery.

Delivery Information

Your order will be sent with Royal Mail or Parcelforce, you will receive an email once it has been dispatched. Orders are dispatched within 2 days unless stated otherwise. Plain packaging.

30 Day Money Back Guarantee

We offer a money back or replacement guarantee on all of our products. To claim your replacement or refund please send us photos of the issue to: support@williamscosupplies.com and we will do our best to help you.