• A vibrant box labeled “8 lb Monotub Refill Kit – 3 lb Sterilized Grain & 5 lb Bulk Substrate” features CVG substrate, sterilized grain spawn, mushrooms, and a wizard illustration with Spore Sorcery branding.
  • Three images: soil with small pebbles, a hand holding a block of Spore Sorcery’s 8 lb Monotub Refill Kit – featuring 3 lb Sterilized Grain & 5 lb Bulk Substrate with mushrooms sprouting, and a container of harvested mushrooms on a wooden surface. Text above reads, GROW LIKE MAGIC!.
  • A bold purple graphic featuring the message “We Never Compromise on Quality” alongside icons of an approval badge, a wizard, and a mushroom grow bag. Text spotlights mycologist endorsements, 30 years of expertise, and extra-large bags—all part of the Spore Sorcery 8 lb Monotub Refill Kit (3 lb sterilized grain & 5 lb premium CVG bulk substrate), expertly prepared to deliver optimal results for every home cultivator.
  • Comparison of two mushroom refill kits: The Spore Sorcery 8 lb Monotub Refill Kit – 3 lb Sterilized Grain & 5 lb Bulk Substrate offers clean, plant-based ingredients in thick, hydrated bags, with premium sterilized grain spawn and quality CVG substrate. Competing refill kits are often packaged in thin bags, are dry or contaminated, and may use cheap fillers in their grain mix. Text and images clearly highlight these differences.
  • A graphic highlighting the ingredients in Spore Sorcery’s 8 lb Monotub Refill Kit – 3 lb Sterilized Grain & 5 lb Bulk Substrate: includes 3 lb sterilized milo sorghum grain and 5 lb of a premium CVG substrate. Featured nutrients are milo sorghum, coco coir, vermiculite, azomite, and gypsum.
  • A group of brown mushrooms sits beside a list of features on a yellow wavy background with bold text: Grow Better With Proven Quality. Ideal for home cultivators, this scene showcases key products from Spore Sorcery, including the 8 lb Monotub Refill Kit—complete with 3 lb Sterilized Grain and 5 lb Bulk Substrate—providing everything you need for thriving mushroom cultivation.
1 6

13 lb Monotub Refill Kit – 5 lb Sterilized Grain & 8 lb Bulk Substrate

13 lb Monotub Refill Kit – 5 lb Sterilized Grain & 8 lb Bulk Substrate

$49.99 USD
$55.99 USD $49.99 USD
$0.39 oz
Sale Sold out
Shipping calculated at checkout.

Keep your grow cycle going with a complete monotub refill: 5 lbs of sterilized milo sorghum grain spawn and 8 lbs of pasteurized bulk substrate, ready to use straight out of the bag.

Made for growers who want to run the next batch without buying a whole new kit. Add your liquid culture (sold separately) and go.

What's included

  • 5 lbs sterilized milo sorghum grain spawn: double-washed and soaked overnight in RO water, enriched with gypsum, then vacuum-sealed.
  • 8 lbs bulk substrate: coco coir, vermiculite, gypsum and Azomite, pasteurized and hydrated to field capacity.

Why growers refill with us

  • No prep work: nothing to soak, mix or sterilize — inoculate, mix and maintain humidity.
  • Plant-based substrate: longer shelf life and no odor.
  • Fast colonization: hydrated to field capacity with the minerals mycelium needs for multiple flushes.
  • Clean and sealed: lab-tested, heat-sealed with a 10 mm industrial seal in thick 3 mil bags.
  • 0.5 micron filter patch: proper airflow without letting contaminants in.
  • Fits most monotubs: a straight swap for your next run.

Why Spore Sorcery? Over 30 years of mycology experience, and every batch made fresh in a sterile commercial facility and lab-tested before it ships.

Note: This kit contains no mushrooms or mushroom culture. It is a sterilized growing medium for home mushroom cultivation.

View full details