12qt Shoebox Refill Kit – Clean, Simple, and Ready to Run2 lb Sterile Grain + 5 lb Substrate — Built for 12qt Shoebox Tubs Fast Refill. Zero Guesswork. The 12qt Shoebox Refill Kit gives you everything needed to reload your shoebox grow without starting from scratch. Designed for clean handling, reliable colonization, and simple workflow. What's Included 2 lb Sterile Grain Bag – Choose Corn or Milo (4T Unicorn bag with filter) 5 lb Premium Substrate – Hydrated to field capacity FREE Self-Healing Injection Port Why Growers Choose This Kit Lab-Sterilized Grain – Sterilized 2.5 hours in SH Scientific autoclaves at 15–17 PSI Balanced Ratio – Sized specifically for 12qt shoebox tubs Premium Substrate – Clean, consistent hydration and structure Streamlined Workflow – Ideal for quick turnaround grows How It Works Inoculate the sterile grain bag. Allow full colonization at 70–75°F. Mix colonized grain with the included substrate. Transfer to your 12qt shoebox tub and allow substrate colonization. Introduce fruiting conditions and monitor humidity. Storage Guidelines Store sealed between 45°F and 70°F Use as soon as possible for best results Do not freeze Explore Other Grain Options Corn Grain Bags – Durable kernels with strong structure. Drippy Corn – Nutrient-dense option for advanced growers. Millet Grain Bags – High inoculation points for rapid colonization. Need Assistance?Hit the chat button at the lower right for help with orders or product questions. Legal Disclaimer: For laboratory use only. We assume no responsibility for product misuse. Sales are final and concerns are addressed on a case-by-case basis. ✅ For legal gourmet/culinary/medicinal mushroom cultivation only. This kit is intended exclusively for growing edible gourmet, culinary, and medicinal mushroom species. Not intended for any illegal use.
