Cannabis Storage Conditions: Temperature and Humidity
Store cannabis at 59-70°F and 55-65% relative humidity in an airtight, light-blocking container. Here is how temperature and humidity protect potency.
Best humidity pack for cannabis
Boveda 62% in the 8 gram size is the pick for home jars. The pack holds relative humidity at 62% and works in two directions. It releases water when flower is dry. It takes in water when flower is wet. Boveda rates the pack at ±1% RH. One 8 gram pack covers up to 28 grams of flower.
Why 62% RH
ASTM standard D8197 sets a water activity range of 0.55 to 0.65 for dry cannabis flower. Mold and yeast grow above a water activity of 0.65. A two-way pack at 62% RH holds flower inside that range at room temperature. A 58% pack fits people in humid states, people who grind and vape within days, and people who want drier flower.
how to maintain humidity in cannabis jar
Runner-up: Integra Boost 62%
Integra Boost holds 62% RH. The pack ships with an indicator card. The card changes color when the pack is spent. Integra lists accuracy at ±2% RH. Sizes run 4 g, 8 g, 62 g, and 320 g. The 8 g pack covers up to 28 grams of flower.
Boveda vs Integra Boost
- Accuracy: Boveda ±1% RH. Integra Boost ±2% RH.
- End of life: Boveda packs turn rigid and crunchy. Integra Boost uses the color card.
- Sizes: Boveda 4 g, 8 g, 67 g, 320 g. Integra Boost 4 g, 8 g, 62 g, 320 g.
- Cost: both brands drop in price per pack in boxes of 12 or more.
Size chart
- Up to 14 g: 4 g pack.
- Up to 28 g: 8 g pack.
- Up to 450 g: 67 g Boveda or 62 g Integra Boost.
- Bulk totes: 320 g pack.
Limits
No pack kills mold, fixes an ammonia smell, or restores terpenes that left the jar. Some growers report terpene loss with packs. Public test data on that claim is thin, so treat it as an open question. Store jars at 60 F to 70 F in the dark. Burp new flower for the first week, then seal it with a pack. Replace a pack when it turns rigid or when the card changes color.