Mold needs moisture. Keep cannabis at 55-65% relative humidity. Store in airtight glass. Keep temperature 60-70°F. Keep dark.
Why Mold Grows on Cannabis
Mold spores are everywhere. They grow when water activity is high. For cannabis, that means relative humidity above 65%. Temperature above 77°F speeds growth. Light breaks down THC and can raise moisture.
Ideal Storage Conditions
- Relative humidity: 55-65%.
- Temperature: 60-70°F.
- Light: none.
- Container: airtight glass.
- Moisture content: 10-12%.
Containers and Tools
Use glass mason jars with airtight lids. Add a 62% relative humidity pack. Use a hygrometer. Keep jars in a dark cabinet. Do not use plastic bags. Plastic bags let air in and out.
how long does cannabis stay fresh in a jar
What to Avoid
- Heat above 77°F.
- Humidity above 65%.
- Light.
- Plastic bags.
- Fridge or freezer. Moisture cycles.
Signs of Mold
White powdery spots. Gray or black fuzz. Musty smell. Mold can grow inside buds. Break open a bud to check. If mold is present, discard the whole jar.
How to Keep Weed Fresh Long Term: A Comprehensive Guide
Steps to Prevent Mold
- Dry cannabis to 10-12% moisture before storage.
- Put buds in a glass jar. Fill 3/4 full.
- Add a 62% humidity pack.
- Close lid tight.
- Store at 60-70°F in the dark.
- Open the jar for 5 minutes each week for the first month.
- Check humidity with a hygrometer.
- Remove any buds with mold.
Convenience drives cannabis storage choices. Pre-packaged jars and humidity packs save time. But they do not replace checking humidity and temperature. A $15 hygrometer prevents mold loss.