Cannabis curing jars with Boveda packs hold flower at a steady 58% or 62% relative humidity, which slows the cure, protects terpenes, and cuts the risk of mold. Put one 8-gram Boveda pack in a quart mason jar filled about three-quarters with dried flower, seal the lid, and store the jar in a dark spot between 60 and 70°F. The pack adds or absorbs moisture on its own, so you burp the jar much less.
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What Does a Boveda Pack Do in a Cure Jar?
A Boveda pack is a membrane pouch filled with a saturated salt solution. It releases water vapor when the air around it drops below its rated humidity, and it pulls vapor back in when the air climbs above that mark. That two-way action is why it works as a humidity controller instead of a one-way humidifier.
The salt blend inside sets the target. A 62% pack keeps the air in the jar near 62% RH until the pack gives up its water. A 58% pack holds a lower target with the same mechanics.
- 62% RH: flower stays spongy and does not crumble.
- 58% RH: drier material that burns clean in a vaporizer.
- Other levels in the Boveda catalog are built for cigars, wooden instruments, and food storage, not cannabis.
62% or 58%: Which Boveda Should You Use?
Both levels sit inside the safe cure window of 55% to 65% RH. The choice comes down to how you smoke and how damp your climate runs.
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- Pick 62% for hand-rolled joints, pipes, and bongs. Buds stay pliable and hold their shape.
- Pick 58% for dry herb vapes, which work best with drier flower.
- Pick 58% if you live in a coastal or rainy region where jars already run humid.
- Stay with one level for a whole batch. Switching packs back and forth makes the cure uneven.
How to Pick a Jar
Glass mason jars with airtight lids are the standard. They hold humidity, trap odor, and do not leach into the plant.
- Quart jar: about 1 ounce of flower with the right air space.
- Pint jar: about half an ounce.
- Fill to roughly 75%. The pack needs open air to move vapor.
- Use amber glass or keep jars in a cabinet. Light breaks down cannabinoids and terpenes.
- Skip plastic tubs and zip bags for long cures. They pass air and collect static.
Step-by-Step: Curing With Boveda Packs
The cure starts after the dry. Flower that goes into a jar wet will mold no matter how many packs you add.
- Dry first. Hang whole branches in a dark room at about 60°F and 60% RH for 7 to 14 days. Small stems should snap, not bend.
- Trim and jar. Cut buds from the stems, fill each jar to about three-quarters, and close the lid.
- Burp through week one. Open the jars for 5 to 10 minutes twice a day to vent the green smell and drop the inside humidity.
- Add the pack. At the start of week two, drop in a Boveda sized to the jar. You can add one on day one, but waiting a week lets you smell for hay or ammonia.
- Store dark and cool. A cabinet at 60 to 70°F works. Skip the fridge and the freezer.
- Check every few days. Look for white fuzz, a sweet smell, or buds that stick together.
How Many Boveda Packs Per Jar?
Boveda publishes a size chart, and the ratio scales with the weight of the flower.
- 4-gram pack: up to half an ounce in a pint jar.
- 8-gram pack: up to one ounce in a quart jar.
- 67-gram pack: bulk storage, about a pound in a sealed bucket or tote.
- Two 8-gram packs in one quart jar: fine. Extra packs speed up the adjustment and will not push humidity past the rating.
Do You Still Need to Burp With Boveda?
Yes for the first week, then much less. Burping in week one vents the gases that make smoke harsh and gives you a reason to inspect the buds.
Once the packs settle the jar, most growers open it once a week or stop. The Boveda handles the humidity swings that burping used to fix.
How Long Should a Cure Run?
Two weeks is the floor. Four to eight weeks is where most flower hits its stride, with a smoother draw and a fuller flavor.
Sealed jars with a fresh pack can hold that quality for six months or longer. Past that point, THC starts to break down and the taste fades.
Common Mistakes
- Jarring flower that is still wet. Above 65% RH, mold can take hold in days.
- Filling the jar to the rim and leaving no air space.
- Trusting a cheap hygrometer. Calibrate it with a salt test or a Boveda calibration kit before you rely on the number.
- Recharging stiff packs. Boveda advises replacing a pack once it turns crunchy.
- Curing in sunlight or a warm room, which cooks off terpenes.
- Mixing strains in one jar. Smell and finish times differ.
FAQ: Boveda Packs and Cannabis Curing
Can a Boveda pack fix flower that dried out?
It restores moisture over two to four days, and the buds soften. Terpenes that already evaporated do not come back, so the flavor stays flatter than a proper cure would give.
How do I know when a pack needs replacing?
Squeeze it. A working pack feels soft and liquid inside. A pack that feels stiff or crunchy has given up its water and should go in the trash.
Can you cure in something other than a glass jar?
Yes. Sealed food-grade buckets, humidity-control bags, and stainless containers all work for large harvests. A jar is the easiest size to manage for personal amounts.
Does Boveda change the taste of the flower?
No. The pack holds water, not scent. It has no aroma and adds nothing to the plant.