Cannabis Humidor Guide: Store Flower at 58-62% RH

A cannabis humidor is a sealed container that keeps relative humidity between 58% and 62% at a temperature near 21°C (70°F). This range preserves terpenes and THC while preventing mold. Use a hygrometer to measure humidity and a two-way humidity pack to hold the target.

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Why a humidor beats a jar alone

An airtight jar stops outside air. It does not control moisture inside. Flower that dries below 55% RH crumbles and loses smell. Flower above 65% RH grows mold. A humidor adds a two-way humidity source and a gauge. You see the number and adjust.

cannabis storage cabinet humidor

Prerequisites

• Airtight container with a gasket
• Digital hygrometer with ±2% accuracy
• Two-way humidity packs rated 58% or 62% RH
• Cannabis flower cured and dried to 10-12% moisture content
• Thermometer or a room with stable temperature

How to set up a cannabis humidor

Set up the humidor before you add flower. A new container can hold odors from manufacturing. Use one 8-gram humidity pack for every 14 grams of flower. The steps below take about 30 minutes of active work and 24 hours of waiting.

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1. Wash the container with warm water and mild soap.
2. Rinse all soap residue from the container.
3. Dry the inside with a clean cloth.
4. Place the digital hygrometer inside the container.
5. Close the lid and wait 30 minutes.
6. Note the starting humidity reading.
7. Open the container.
8. Put one humidity pack on the floor of the container.
9. Close the lid.
10. Wait 24 hours without opening the lid.
11. Read the hygrometer.
12. Add a second pack if the number is below 58%.
13. Remove the pack for 12 hours if the number is above 62%.
14. Check the hygrometer again.
15. Add flower to the container.
16. Leave 25% of the volume empty for air circulation.
17. Close the lid.
18. Store the container in a dark cabinet at 18-22°C (65-72°F).

Daily and weekly care

1. Open the lid for 30 seconds each week.
2. Turn the flower with clean hands or a spoon.
3. Replace the hygrometer battery every 6 months.
4. Swap humidity packs every 2 to 3 months.

Calibrate the hygrometer

1. Mix 1/2 cup of salt with 1/4 cup of water in a bowl.
2. Place the bowl and the hygrometer in a sealed plastic bag.
3. Wait 24 hours.
4. Read the hygrometer. It should show 75%.
5. Adjust the hygrometer offset if it does not show 75%.
6. Replace the hygrometer if it cannot be calibrated.

Signs of trouble

Check flower every week for the first month. Mold appears as white or gray fuzz. It smells like ammonia or hay. Remove any affected bud and clean the container with 70% isopropyl alcohol.

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• RH below 55%: flower is dry. Add a 62% pack. Wait 48 hours.
• RH above 65%: mold risk. Remove flower and check for white fuzz. Discard any bud with fuzz.
• Ammonia smell: flower is too wet. Remove the pack. Leave the lid open for 2 hours. Check again.
• Hygrometer reads 99% or 1%: sensor failed. Replace the hygrometer.

Long-term storage notes

For storage beyond 6 months, use 58% RH packs. Lower humidity slows microbial growth. Keep the container away from light. Light degrades THC. Do not freeze flower. Freezing breaks trichomes and adds moisture when the container warms.