No-Pressure-Cooker Mushroom Tek (for Beginners)

If you’re new to mushroom growing and don’t have a pressure cooker, don’t worry. You can still grow successfully using boiling water and basic supplies. Here’s how.

Low-Tech Supplies

• Wide-mouth mason jars or plastic containers
• Brown rice flour or millet
• Vermiculite
• Boiling water bath (large pot)

Basic Steps

1. Mix 2 parts vermiculite, 1 part brown rice flour, and 1 part water.
2. Load into jars. Cover lids with foil.
3. Steam for 90–120 minutes in a covered pot.
4. Let cool fully and inoculate with LC or spore syringe.
5. Incubate and wait for full colonization before fruiting.

While not as sterile as pressure cooking, this method works well for beginners and hobbyists growing oyster mushrooms or reishi.

Want to skip the prep? Buy pre-colonized grain spawn here