Wholesale Sterilised Popcorn Grain Bags – 1kg & 1.5kg (Bulk Mushroom Spawn)

Looking for reliable wholesale sterilised popcorn grain bags? Our 1kg and 1.5kg bags are prepared to the highest standards, providing sterile, consistent grain ready for inoculation. Designed for commercial mushroom growers, farms, and resellers, these bags make spawn production at scale simple and dependable.

Every batch is sterilised using professional autoclaves, ensuring a completely sterile substrate and excellent colonisation success. Popcorn's large, hard kernels hold their shape through sterilisation and shaking, and each one carries plenty of nutrition, giving strong jump points when you spawn to bulk.

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.

We offer flexible wholesale quantities, from 25 to 1,000+ units, at competitive prices that beat the market. Our fast turnaround and strict quality control make us the trusted choice for bulk mycology supplies in the UK and beyond.

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.