Agar Plate If you’ve been exploring mushroom cultivation, you’ve probably seen agar plates mentioned alongside spores and liquid culture — and wondered whether you actually need them. The honest answer: probably not at first. But once you’re ready to level up your grows, agar becomes one of the most powerful tools in your kit. This guide explains what agar is, how it fits into the cultivation workflow, and exactly when it’s worth adding to your process. “Agar is where serio