Quick answer

To control humidity in a cannabis humidor, hold relative humidity (RH) between 58% and 62%. Use two-way humidity packs and a calibrated hygrometer. If RH drops, add a pack. If RH rises, remove a pack or add a dry medium like silica gel.

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Prerequisites

  • A cannabis humidor with a tight seal.
  • A digital hygrometer that reads RH.
  • Two-way humidity packs rated for 58% or 62% RH.
  • Distilled water for calibrating the hygrometer (if needed).

Step-by-step humidity control

  1. Calibrate your hygrometer. Place it in a sealed container with a salt solution (1/2 cup salt, 1/4 cup distilled water). Wait 24 hours. The reading should be 75%. Note the offset.
  2. Set the target RH. For most cannabis flower, 58% to 62% RH is ideal. Choose 58% for long-term storage and 62% for immediate use.
  3. Place humidity packs in the humidor. Use one pack per 1/2 ounce of flower. For larger amounts, use multiple packs. Do not let packs touch the flower.
  4. Close the humidor and wait 24 hours. Let the packs and flower equalize.
  5. Read the hygrometer. If RH is below 58%, add another pack. If RH is above 62%, remove a pack or add a dry medium.
  6. Check the hygrometer daily for the first week. Then check weekly. Adjust as needed.
  7. Replace humidity packs when they become hard or dry, every 2 to 4 months.

Monitoring and adjustments

Temperature affects RH. Keep the humidor between 60°F and 70°F. Higher temperatures lower RH and can degrade terpenes. Lower temperatures raise RH and can cause mold. If you live in a dry climate, you may need more packs. In a humid climate, you may need to add a desiccant pack.

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Burp the humidor every few days for the first week. This exchanges air and prevents stale smells. After that, burp weekly if you open the humidor often.

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Common mistakes

  • Using a hygrometer without calibration. Uncalibrated readings lead to wrong adjustments.
  • Overpacking the humidor. Air needs to circulate.
  • Using a one-way humidifier. These add moisture but cannot remove it, causing mold.
  • Ignoring temperature. RH and temperature work together.