Sterile Substrates
Three Bags. Every Stage of Your Grow.
Whether you're inoculating with spores, running grain spawn, or setting up a bulk fruiting chamber — there's a bag for exactly where you are in the process.
All-in-One Bags
Simplest Route to Harvest
Sterilized corn spawn and substrate in a single sealed bag. Inject your spores — no transfers, no opening, no mess. Designed for Psilocybe cubensis growers who want results without the complexity.
Shop All-in-One Bags →Sterile Grain Bags
For Liquid Culture Inoculation
Millet and corn grain bags, fully sterilized and ready to inoculate with your liquid culture. Grain spawn colonizes quickly and evenly — the most reliable foundation for any grow.
Shop Grain Bags →Substrate Bags
Bulk Fruiting Substrate
CVG (coco coir, vermiculite, gypsum) substrate bags — sterilized and ready for bulk fruiting. Nutrient-rich, moisture-retentive, and proven across gourmet, medicinal, and psychedelic species.
Shop Substrate Bags →What are sterile substrates?
Sterile substrates are pre-sterilized growing media that give your mushroom mycelium the nutritional foundation it needs to colonize and fruit. By removing the sterilization step from your workflow, you eliminate the most common source of contamination in home cultivation — without needing a pressure cooker, flow hood, or any lab equipment.
No contamination risk
Each bag is sterilized and sealed in our lab. No grain wet spots, no residual bacteria, no failed sterilization cycles. You open it when you're ready to inoculate — not before.
Fast colonization
Reviewers consistently cite speed — fully colonized within days. A-class organic ingredients give mycelium the nutrition it needs to spread aggressively from the first day.
Made by a mycologist
Every bag is prepared and tested by our in-house mycologist before it ships. Not outsourced. Not resold. Made here, shipped from the Netherlands, across Europe.
Not sure which bag to choose?
The right bag depends on where you are in the growing process:
Millet vs Corn Grain Bags — What's the Difference? →
Need a Liquid Culture to go with it?
Our sterile grain bags are made to work with our liquid cultures — prepared by the same mycologist, in the same lab. 25+ strains across four families. Gourmet, medicinal, and psychedelic varieties available.