Wholesale Sterilised Masters Mix Substrate Bags – 2.5kg & 4.5kg (Bulk Mushroom Substrate)

Looking for reliable wholesale sterilised Masters Mix? Our Masters Mix of hardwood and soy hulls is hydrated to field capacity and sterilised at 121°C for 2.5 hours, ready to inoculate with your grain spawn. It's made for commercial growers, farms and resellers producing gourmet and medicinal mushrooms.

Available in 2.5kg and 4.5kg bags, in wholesale quantities from 25 to 1,000+. Every option shows the price per kg, so you can see exactly what you're paying.

Which bag each size comes in

• 2.5kg: Unicorn 14A
• 4.5kg: Unicorn XLS-A Horizon, Unicorn's largest bag, for big, high-yielding blocks

Genuine Unicorn bags only. Every bag we ship is a genuine Unicorn bag, the industry-leading mushroom grow bag made in the USA. We never cut corners with cheap generic bags. Unicorn bags are built to handle the autoclave and their filter patches are consistent bag after bag, so you get cleaner colonisation and fewer losses.

Free UK delivery on every order, by Royal Mail or on a pallet with a tail lift. We also ship to Europe, just contact us for a quote.