Why Your Bag Isn’t Colonizing
Why Your Bag Isn’t Colonizing
If your grain or substrate isn’t colonizing, something in the process is off. This guide covers the most common reasons and how to fix them.
Common Causes
Too much liquid culture
Over-inoculating can slow growth and create excess moisture.
Temperature is off
Too cold slows growth. Too hot can stall or damage mycelium.
Not enough air exchange
Mycelium needs oxygen. Completely sealed or compacted bags can stall.
Weak or contaminated culture
If your culture isn’t healthy, colonization will be slow or inconsistent.
Grain too wet or too dry
Improper moisture content can prevent healthy growth.
What to Check
- Is the bag getting any airflow through the filter?
- Is it stored around 68–75°F?
- Is there visible contamination?
- Was too much liquid injected?
- Has it been enough time? (some grows are just slow)
What to Do
- Move to a stable room temperature environment
- Allow the bag to breathe through the filter patch
- Be patient if everything looks clean
- If contamination is present, discard the bag
- Adjust your inoculation amount next time
Important Notes
- Some species colonize slower than others
- Do not keep checking or handling the bag constantly
- Avoid direct sunlight or heat sources
- Consistency matters more than perfect conditions
Common Mistakes
- Assuming it’s stalled too early
- Storing in unstable temperatures
- Over-inoculating
- Not allowing airflow
- Using poor quality culture