How to store cannabis flower properly
Humidity, temperature, light and air are the four things that degrade cannabis flower. Here is what each one does, and how to store it.
Humidity matters most
Flower that is too dry goes brittle, crumbles, loses its smell and smokes harshly. Flower that is too damp risks mould, which is a far more serious problem.
The workable range is roughly 59–64% relative humidity, and should not exceed 65%. Measuring it means a small hygrometer inside the container — you cannot judge this accurately by look or feel.
Temperature and light
Keep it dark, cool and dry, around 15–21°C. Direct sunlight noticeably accelerates the breakdown of terpenes and active compounds. A closed cupboard in a room that does not get hot beats a shelf in the sun.
Do not use the fridge or freezer. Cycling the temperature causes condensation inside the container, and that is exactly how moisture accumulates and mould starts.
Containers
A glass jar with an airtight seal is the best long-term option. Glass does not absorb smell and does not react with resin. Ordinary plastic bags have two problems: static that pulls trichomes off the flower, and seals that are not really airtight.
Do not pack it tight. Compressed flower loses its shape and crumbles. Match the jar size to the amount you have, because excess air in the jar degrades it too.
How long it keeps
Well stored, flower is generally good for about 6–8 months after harvest. After that the smell and flavour fade first, then the smoothness. Older cannabis is not dangerous in itself, but the quality falls away steadily.
The short version
- 59–64% RH, measured with a hygrometer
- 15–21°C, in the dark
- Airtight glass jar, sized to the amount
- No fridge, no sunlight, no packing tight
- Use within about 6–8 months
