A mushroom culture is a living colony of fungal mycelium of a specific species or strain, grown on sterile nutrient medium. The three commercially available forms are liquid culture (mycelium in nutrient broth), plate culture (mycelium on solid agar), and grain spawn (mycelium fully colonized into sterilized grain). All three are alive and ready to expand into a fruiting grow.

Liquid culture is the easiest starting point — a single 10ml syringe inoculates 10 to 20 grain jars or all-in-one bags, requires no flow hood, and starts colonizing within hours of injection. If you want to select your own genetics or build a strain library, plate cultures are the natural next step.

Refrigerated liquid culture stays viable for about three weeks. Plate cultures stay viable for several months and are the standard format for long-term strain archiving. Grain spawn is most vigorous within 2 to 4 weeks of full colonization. Use any culture as soon as possible after receipt for the healthiest, most vigorous mycelium.

Mycology-Supply ships lab-made mushroom cultures direct from California — liquid culture syringes, agar plate cultures, and grain spawn. Every culture uses a named, lab-verified strain. Free shipping on culture orders, and a lifetime 15% discount on agar plates with your first purchase.

Not for liquid culture — a sanitized self-healing injection port on a grain bag is enough for clean technique. Plate culture work (opening dishes, transferring wedges) does need a laminar flow hood or still air box, since agar is an open medium susceptible to airborne contamination. Grain spawn requires no flow hood at all — just mix it cleanly into your substrate.