https://magicmushroomsubstrate.co.uk/tags/substrate-preparation/Recent content in Substrate Preparation on Mushroom Substrate ScienceHugoen-gbThu, 05 Mar 2026 00:00:00 +0000https://magicmushroomsubstrate.co.uk/methods/pasteurization/Thu, 05 Mar 2026 00:00:00 +0000https://magicmushroomsubstrate.co.uk/methods/pasteurization/<p>Look, everyone wants sterile substrate. But do you actually need it? Honestly, mostly no. Pasteurisation isn&rsquo;t about nuking everything. It reduces microbial populations WITHOUT eliminating all organisms. Creates a selective environment where your fungus dominates. It&rsquo;s the standard for <a href="https://magicmushroomsubstrate.co.uk/substrates/bulk/">bulk substrates</a>.</p> <h2 id="why-pasteurise-not-sterilise">Why Pasteurise Not Sterilise?</h2> <p>Sterilised substrate equals biological vacuum. First contaminant spore that lands colonises freely. Ever tried fighting trich in a sterile jar? Yeah, doesn&rsquo;t go well. Pasteurised substrate retains heat-tolerant beneficial bacteria that compete with contaminants. Called &ldquo;competitive exclusion&rdquo; or &ldquo;biological buffer.&rdquo;</p>