Definition
Inoculation is the process of introducing mushroom spores or liquid mycelium culture into a sterile (or pasteurized) substrate to begin the growing process. It is typically done with a spore syringe or liquid culture syringe, injected through a self-healing injection port, under still-air or laminar flow-hood conditions to minimize the risk of contamination.
How Inoculation Works
Grain substrates are the most common inoculation target because they require full pressure-cooker sterilization (typically 15 PSI for 90-120 minutes) to eliminate competing organisms before spores or mycelium are introduced, giving the cultivator's chosen genetics a clean start free of bacteria or mold spores. The needle is flame-sterilized and cooled before each injection to avoid introducing contamination at the moment of inoculation itself, and jars are usually inoculated in a still-air box or under a flow hood to reduce airborne contaminant exposure during the brief window the substrate is open.
After inoculation, jars are moved to warm, dark conditions for colonization, typically taking 2-4 weeks depending on temperature (commonly 24-26°C), inoculation volume, grain type, and strain vigor. Shaking jars once partial colonization is visible — roughly 30-40% coverage — helps distribute mycelium and speeds up full colonization. Using liquid culture rather than a spore syringe generally produces faster, more uniform colonization since it introduces already-established mycelium rather than spores that must first germinate.
Inoculation is one of the highest-risk points for introducing contamination into a grow, since it's the moment sterile substrate is briefly exposed to open air. Good technique — clean equipment, minimal exposure time, and a controlled airflow environment — is what separates a clean colonization from one lost to mold or bacteria.
Related Reading
- Spawn Instructions
- Sterile Technique Guide
- Colonization (Glossary)
- Sterilization (Glossary)
- Back to the full Glossary
This page is educational only and is not medical or legal advice. Psilocybin mushrooms are illegal in most jurisdictions; check your local laws.