Pasteurization or sterilization? Knowing the difference can save you time, energy, and contaminated blocks. We’re breaking down when to use each method, what your substrate actually needs, and exploring an experiment from the Swamp Fox Fungi grow room: 80/20 hardwood sawdust and wheat bran treated at 190°F for 5 hours. Let’s look at what the research says and where there’s still room to experiment.