BRF Jars — PF Tek Mushroom Substrate
BRF Jars &
PF Tek Substrate
Pre-sterilized brown rice flour and vermiculite jars with self-healing injection ports and gas-exchange filters. Inject your spore or liquid culture syringe and incubate — no pressure cooker, no substrate prep, no flow hood required.
The PF Tek Method
Developed in 1992 by Robert McPherson, the PF Tek was the first widely-published technique that made small-scale mushroom growing accessible to hobbyists. The substrate is deceptively simple: organic brown rice flour for nutrient density, vermiculite for moisture retention and aeration, hydrated to the precise ratio that lets mycelium colonize through a sealed jar. Three decades later, it remains the gold standard for first-time growers and a workhorse for serial cultivators running multiple jars at a time.
Inject
1–2 cc of spore or liquid culture through the self-healing port. No flow hood required.
Incubate
75–81°F in a clean, dark space. Mycelium colonizes the cake fully white in 3–5 weeks.
Birth
Release the colonized cake into a perlite-lined fruiting chamber for humidity and air exchange.
Fruit
First pins within days. Full flush over 1–2 weeks; jars often produce multiple flushes.
Every jar in this collection is pressure-sterilized in our commercial autoclave — not a home pressure cooker — and sealed with a modified lid combining a self-healing injection port and a gas-exchange filter patch. Inoculate cleanly in still air, scale up to 12-jar cases for serial grows, or grab the Starter Kit with everything you need for a first run. BRF jars pair naturally with pre-poured agar plates for strain isolation or liquid cultures for faster colonization than spore syringes.
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