PF Tek Method

The classic beginner-friendly tek using brown rice flour and vermiculite in half-pint jars.

Beginner · 4-6 weeks to harvest

PF Tek (Psilocybe Fanaticus Technique) is the most popular beginner method. It uses cheap, accessible materials and is forgiving of small mistakes. You'll grow mushrooms directly on small cakes made from brown rice flour and vermiculite.

Equipment & Supplies

• Half-pint wide-mouth mason jars (12 pack)
• Brown rice flour (1 lb)
• Vermiculite (fine or medium grade, 8 qt)
• Pressure cooker (at least 8 qt)
• Spore syringe
• Still air box (plastic tub with arm holes)
• Micropore tape
• Perlite (8 qt for SGFC)
• Large plastic tub (for fruiting chamber)
• Spray bottle
• Isopropyl alcohol (70%)
• Lighter
• Nitrile gloves
• Foil

Step 1: Gather Materials

You'll need: half-pint wide-mouth mason jars (12 pack recommended), brown rice flour (BRF), vermiculite (fine or medium grade), water, a pressure cooker, spore syringe, still air box, micropore tape, and a fruiting chamber (shotgun fruiting chamber or plastic tub with perlite). Total cost is typically $50-75 for your first grow.

Step 2: Prepare Substrate

Mix 2 parts vermiculite, 1 part brown rice flour, and 1 part water by volume. The mix should hold together when squeezed but not drip—this is called 'field capacity.' Fill jars to 1/2 inch below the rim, then top with a layer of dry vermiculite (this is your contamination barrier—don't skip it). Punch 4 holes in the lid with a nail.

Step 3: Sterilization

Cover jars with foil (shiny side down) and pressure cook at 15 PSI for 60–90 minutes. Let cool completely—overnight is safest. Never inoculate warm jars; condensation leads to contamination. The jars are ready when they're room temperature and no moisture is visible inside.

Step 4: Inoculation

Work in a still air box wiped down with isopropyl alcohol. Flame-sterilize your needle until red-hot, let it cool for 10-15 seconds. Inject ~0.5-1cc of spore solution through each of the 4 holes (covered with micropore tape). Tilt the jar so solution runs down the glass—this lets you see colonization progress. Seal holes with fresh micropore tape.

Step 5: Colonization

Store jars in a dark, warm place (75–80°F). Mycelium will appear as white growth within 1–2 weeks. Full colonization takes 3–5 weeks. Don't open or shake the jars. Watch for green, black, or orange contamination—discard any contaminated jars immediately. Wait 1 week after full colonization before birthing to let the cake consolidate.

Step 6: Birthing and Dunking

Remove the cake from the jar by tapping gently or using a clean fork to pry it out. Rinse gently under cool water to remove loose vermiculite. Submerge in clean water for 12–24 hours (this rehydrates the cake for fruiting). After dunking, roll the cake in dry vermiculite for a moisture-retaining casing layer.

Step 7: Fruiting

Place cakes in a fruiting chamber on foil squares or jar lids (not directly on perlite). Mist the chamber walls (not the cakes directly) 2-3 times daily. Fan for 30 seconds after misting to provide fresh air exchange. Maintain 85-95% humidity and 70-75°F temperature. Pins should appear within 1–2 weeks.

Step 8: Harvesting

Harvest when veils begin to tear by twisting gently at the base. Don't wait until caps fully open—potency decreases and spores make a mess. After harvest, soak the cake again for 12-24 hours and return to fruiting for another flush. Most cakes produce 2–4 flushes with decreasing yields.

Tips & Common Mistakes

Pro Tips

• Don't skip the dry vermiculite layer—it's your contamination barrier.
• Patience during colonization prevents contamination.
• Soak cakes between flushes for better subsequent yields.
• Start with 6-12 jars—some contamination is normal for beginners.
• Keep detailed notes to improve your technique over time.

Common Mistakes

• Skipping the dry vermiculite layer (main contamination barrier)
• Inoculating warm jars (condensation causes contamination)
• Opening jars during colonization to 'check on them'
• Misting cakes directly instead of chamber walls
• Not dunking cakes between flushes (reduces subsequent yields)
• Harvesting too late after spores drop

Frequently Asked Questions