Mushroom Log - Spawn Plug Instructions

Materials Needed:

  1. Mushroom spawn plugs, well covered by white mycelium (or pink in the case of Pink Oysters)
  2. Logs (preferably hardwood like oak, maple, or birch)
  3. Drill with a 1/3-inch drill bit
  4. Hammer
  5. Beeswax or cheese wax
  6. Wax melting pot or double boiler
  7. Brush for applying wax
  8. Hot water (if using double boiler)


1. Selecting Logs:

  • Choose healthy, living logs for mushroom cultivation. Hardwood logs work best, preferably cut from deciduous trees like oak, maple, or birch.
  • Logs should be freshly cut, ideally within a month, to ensure the bark is still intact and the wood hasn’t begun to decompose.

2. Preparing Logs:

  • If the logs have been sitting for a while, soak them in water for 24

to 48 hours before inoculation. This ensures the logs are hydrated and ready for colonization by the mushroom mycelium.

3. Drill Holes:

  • Using a 1/3 inch drill bit, drill holes into the log. The holes should be spaced about 4 to 6 inches apart in a diamond pattern around the log.
  • Drill the holes to a depth of around 1 inch, ensuring they are evenly spaced and staggered to maximize colonization.

4. Inserting Spawn Plugs:

  • Plugs will likely be covered in a lot of mycelium, with clean hands pull the mycelium apart and separate the plugs, keeping as mycelium on each on as possible. 
  • Take the mushroom spawn plugs and gently tap or push them into the pre-drilled holes using a hammer or your thumb. Make sure the plugs are snugly fit into the holes without being forced.
  • Continue this process until all the holes are filled with spawn plugs.

5. Wax Sealing:

  • Melt beeswax or cheese wax in a wax melting pot or a double boiler on low heat, until wax is soft and easy to dip into. 
  • Once the wax is melted, use a brush to apply a thin layer of wax over each spawn plug and the surrounding area of the hole. This helps to seal the plug and prevent contamination while allowing the mycelium to grow.
  • Ensure the wax completely covers the plug and forms a seal with the bark of the log.

6. Storing Logs:

  • After waxing, allow the logs to cool and dry completely before moving them to their final location.
  • Store the logs in a shaded area with good air circulation. Avoid direct sunlight and overly damp conditions, as these can inhibit mushroom growth.

7. Monitoring and Maintenance:

  • Check the logs regularly for signs of mycelium growth, which typically appears as white threads around the spawn plugs.
  • Keep the logs moist by watering them regularly, especially during dry periods.
  • Monitor for any signs of contamination or pests and take appropriate action if necessary.



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