The Short Answer
Keep curing jars at 58% to 62% relative humidity. A reading from 55% to 65% is workable, but 58% to 62% is the sweet spot. Below 55%, the microbial activity that breaks down chlorophyll and sugars slows to a crawl. Above 65%, mold and mildew can take hold within days.
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Why This Range Works
Curing is a slow chemical process. Buds still hold moisture after drying, and that moisture carries enzymes that convert sugars and break down chlorophyll. Terpenes and cannabinoids stay stable when the air in the jar stays slightly damp but not wet. Too dry and the process stalls. Too wet and anaerobic bacteria and mold move in.
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What You Need
- Dried cannabis buds, stems snap when bent
- Glass jars with airtight lids, clean and dry
- A calibrated hygrometer that fits inside the jar
- Two-way humidity control packs rated 58% or 62%
- Latex gloves and a clean work surface
Step-by-Step Curing
- Clean each jar and let it air dry.
- Place a hygrometer inside the jar.
- Fill the jar no more than three-quarters full with dried buds.
- Seal the lid and store the jar at room temperature, away from light, for 12 hours.
- Read the hygrometer.
- Burp the jar for 5 to 10 minutes if the reading is above 62%.
- Reseal the jar if the reading is between 58% and 62%.
- Add a 58% or 62% humidity pack if the reading stays below 55%.
- Repeat the seal-and-check cycle daily for the first week.
- Reduce burping to every three days for weeks two through four.
- Move jars to a dark cabinet at 60F to 70F after the cure stabilizes.
Burping Schedule at a Glance
Week one: open the jar once a day for five to ten minutes. Week two: every other day. Weeks three and four: every three days. After one month, burp once a week or switch to humidity packs and seal the jars for months.
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When Humidity Is Too High
A reading above 65% calls for action. Spread buds on a clean screen for one to two hours, then return them to a clean jar with a fresh hygrometer. If the reading climbs again, repeat. Do not seal wet buds; that is how mold starts.
When Humidity Is Too Low
A reading below 55% means curing has nearly stopped. Add a 62% two-way pack and seal the jar for 24 hours. Do not add water or fruit peels, which introduce mold spores and off-flavors.
Common Mistakes
- Packing jars too full
- Trusting an uncalibrated hygrometer
- Burping for too long and drying the buds out
- Storing in warm or bright places