PF Tek: Complete Step-by-Step Guide

Introduction to PF Tek

The PF Tek (Psilocybe Fanaticus Technique) is one of the most popular and beginner-friendly methods for growing psilocybin mushrooms. Developed in the 1990s, this technique revolutionized home cultivation by making it accessible to beginners with minimal equipment and space requirements.

PF Tek uses simple materials—brown rice flour, vermiculite, and water—in half-pint jars. The method is forgiving, relatively contamination-resistant, and produces reliable results. While yields are smaller than bulk methods, PF Tek is an excellent starting point for learning the fundamentals of mushroom cultivation.

This comprehensive guide provides complete step-by-step instructions for PF Tek, from gathering materials to harvesting your first flush. Whether you're a complete beginner or looking to refine your technique, this guide covers everything you need to know.

What is PF Tek?

Overview

PF Tek is a simple cultivation method that:

• Uses brown rice flour and vermiculite as substrate
• Grows mushrooms directly in half-pint jars
• Requires minimal equipment
• Is relatively contamination-resistant
• Produces smaller but reliable yields
• Is ideal for beginners

Advantages

Beginner-Friendly: Simple and forgiving, perfect for learning

Low Cost: Inexpensive materials and equipment

Small Space: Can be done in a closet or small area

Low Contamination Risk: More resistant to contamination than some methods

Educational: Teaches fundamental concepts

Reliable: Produces consistent results when done correctly

Limitations

Lower Yields: Produces less than bulk methods

More Labor: Requires multiple jars

Smaller Fruits: Mushrooms may be smaller than bulk grows

Limited Flushes: Typically 2-3 flushes before substrate is exhausted

Equipment and Materials

Essential Equipment

Half-Pint Jars: Wide-mouth Mason jars work best. You'll need 6-12 jars depending on desired yield.

Pressure Cooker: For sterilization. A 15-20 PSI pressure cooker is ideal, though a large pot can work as an alternative (less reliable).

Still Air Box (SAB): A plastic storage box with arm holes for sterile work. Can be made from a large plastic tub.

Spore Syringes or Liquid Culture: Your mushroom genetics. Ensure they're from a reliable source.

Vermiculite: Coarse vermiculite for the substrate mix.

Brown Rice Flour: Provides nutrients for the mycelium.

Perlite: For maintaining humidity in the fruiting chamber.

Fruiting Chamber: Large plastic container or similar for fruiting.

Spray Bottle: For misting to maintain humidity.

Thermometer/Hygrometer: To monitor conditions.

Aluminum Foil: For covering jar lids.

Drill and 1/4" Bit: For making holes in jar lids.

Optional but Helpful

• Scale for accurate measurements
• Mixing bowl
• Measuring cups
• Gloves and mask
• Isopropyl alcohol for sterilization
• Lighter or torch for flame sterilization

Step-by-Step PF Tek Instructions

Step 1: Prepare Jar Lids

Materials: Jar lids, drill with 1/4" bit, hammer, nail

Process:

1. Remove the center disk from each lid
2. Drill 4 evenly spaced 1/4" holes around the perimeter
3. Clean lids thoroughly

Purpose: Holes allow gas exchange while preventing contamination.

Step 2: Prepare Substrate

PF Tek Substrate Recipe:

• 2 parts vermiculite
• 1 part brown rice flour
• 1 part water (by volume)

Process:

1. Measure 2 cups vermiculite
2. Add 1 cup brown rice flour
3. Mix dry ingredients thoroughly
4. Add 1 cup water gradually, mixing well
5. Test field capacity: Squeeze a handful. Should release a few drops of water, not a stream
6. Adjust water if needed

Field Capacity: The substrate should be moist but not waterlogged. This is crucial for success.

Step 3: Fill Jars

Process:

1. Fill jars 2/3 full with substrate
2. Pack down gently but firmly
3. Wipe jar rims clean
4. Add a 1/4" layer of dry vermiculite on top (acts as a barrier)
5. Wipe rims again

Important: Keep jar rims clean to ensure proper sealing.

Step 4: Cover and Prepare for Sterilization

Process:

1. Place lids on jars (don't tighten completely)
2. Cover lids with aluminum foil
3. Fold foil around jar necks
4. Prepare for pressure cooking

Purpose: Foil prevents water from entering jars during sterilization.

Step 5: Sterilization

Using Pressure Cooker:

1. Add 2-3 inches of water to pressure cooker
2. Place jars in cooker (use jar rings or trivet to prevent direct contact with bottom)
3. Don't let jars touch each other or sides
4. Seal pressure cooker
5. Bring to 15 PSI
6. Maintain 15 PSI for 90 minutes
7. Allow to cool completely before opening

Alternative (Large Pot): If using a pot instead of pressure cooker:

• Boil for 2-3 hours
• Less reliable but can work
• Ensure jars are covered with water

Cooling: Allow jars to cool completely (overnight is ideal) before inoculating.

Step 6: Inoculation

Preparation:

• Clean your work area thoroughly
• Set up your Still Air Box
• Sterilize everything with alcohol
• Flame-sterilize syringe needle
• Have spore syringe or liquid culture ready

Process:

1. Work inside Still Air Box
2. Remove foil from jar lid
3. Flame-sterilize needle until red hot
4. Allow needle to cool (5-10 seconds)
5. Insert needle through lid hole
6. Inject 1-2ml of spore solution
7. Withdraw needle
8. Replace foil
9. Repeat for all jars

Sterile Technique: Maintain sterile technique throughout. Work quickly but carefully.

Step 7: Colonization

Conditions:

• Temperature: 75-80°F (24-27°C)
• Darkness: Keep in dark or low light
• Still air: Don't disturb unnecessarily
• Patience: Colonization takes 2-4 weeks

What to Expect:

• Mycelium will appear as white, thread-like growth
• Growth starts from injection points
• Gradually spreads through substrate
• Substrate turns white as it colonizes

Checking Progress: Check jars weekly. Look for:

• White mycelium growth
• Contamination (colors other than white)
• Complete colonization (all substrate white)

Contamination: If you see green, blue (not bruising), black, or other colors, the jar is contaminated. Isolate it immediately.

Step 8: Consolidation

After jars are fully colonized:

• Wait an additional week for consolidation
• This allows mycelium to strengthen
• Improves fruiting success
• Don't rush this step

Step 9: Prepare Fruiting Chamber

Materials:

• Large plastic container (Sterilite or similar)
• Perlite
• Water
• Spray bottle

Setup:

1. Clean container thoroughly
2. Add 3-4 inches of perlite
3. Add water until perlite is saturated (water should pool slightly)
4. Drain excess water
5. Perlite should be wet but not standing in water

Purpose: Perlite maintains humidity in the fruiting chamber.

Step 10: Birth the Cakes

Process:

1. Remove foil from colonized jars
2. Run a knife around the edge to loosen cake
3. Gently remove cake from jar
4. Rinse cake under cold water to remove vermiculite barrier
5. Roll in dry vermiculite (optional, helps retain moisture)
6. Place cake in fruiting chamber

Handling: Handle cakes gently to avoid damage.

Step 11: Fruiting Conditions

Conditions:

• Temperature: 70-75°F (21-24°C)
• Humidity: 90-95%
• Light: Indirect light (12 hours on/off)
• Fresh Air Exchange: 2-3 times daily

Maintenance:

• Mist walls and perlite 2-3 times daily
• Fan with lid 2-3 times daily
• Don't mist cakes directly
• Maintain humidity

Step 12: Pinning

What to Expect:

• Small bumps (pins) appear on cakes
• Usually occurs 1-2 weeks after birthing
• Pins grow into mushrooms
• Maintain conditions during pinning

If No Pinning: Check conditions, ensure proper humidity and fresh air exchange.

Step 13: Harvesting

When to Harvest:

• Just before or as veils break
• Veil is the membrane under the cap
• Harvest before spores drop

How to Harvest:

1. Gently twist and pull mushrooms
2. Or cut at base with clean knife
3. Handle gently
4. Harvest all mushrooms from a flush

Step 14: Subsequent Flushes

After first harvest:

• Soak cakes in water for 12-24 hours
• Drain and return to fruiting chamber
• Maintain fruiting conditions
• Second flush usually appears in 1-2 weeks
• Can get 2-4 flushes total

Troubleshooting

Common Problems

No Colonization: Check temperature, ensure proper inoculation, verify spore viability

Slow Colonization: Temperature may be too low, or contamination may be slowing growth

Contamination: Improve sterile technique, check spore source, ensure proper sterilization

No Pinning: Check humidity, fresh air exchange, temperature, light

Aborts: Small mushrooms that stop growing—often due to environmental stress

Tips for Success

• Maintain sterile technique
• Be patient—colonization takes time
• Monitor conditions closely
• Don't over-mist
• Ensure proper fresh air exchange
• Keep detailed notes
• Learn from mistakes

Conclusion

PF Tek is an excellent method for beginners to learn mushroom cultivation. While it requires patience and attention to detail, it's forgiving and produces reliable results. Master PF Tek before moving to more advanced methods.

Remember to always prioritize legal compliance, safety, and proper sterile technique. With practice and patience, PF Tek can provide successful harvests and valuable learning experiences.