How to Dry Cannabis Properly (Slow Dry Method)
Dry cannabis slowly over 10–14 days in the dark at 18–20°C and 55–60% relative humidity, with gentle air movement in the room but never blowing directly on the buds. It’s done when the thin stems snap cleanly rather than bend and the buds feel dry outside with a slight give inside — then jar for curing. No oven, dehydrator or hairdryer, and never dry in the tent with the light on and extraction running: rushing the dry traps chlorophyll and turns months of work into hay.
My first harvest, I hung the buds in the tent with the exhaust on full and the light on, because where else would I dry them? Four days later the outsides were crispy, the insides were damp, and the lot smelled like a freshly mown lawn. Drying is the most underestimated stage in growing, and the maddening part is that doing it right asks for almost nothing — just the right conditions and the patience to leave things alone.
The short version:
- Target 18–20°C and 55–60% humidity, darkness, gentle air movement (not on the buds)
- Slow is the whole point — aim for 10–14 days, not four
- No oven, dehydrator, hairdryer — shortcuts destroy terpenes in minutes
- Never dry in the tent with the light on and extraction running
- Done = stems snap cleanly, buds dry outside with slight give inside
Want the full breakdown? Keep scrolling.
What conditions dry cannabis properly?
18–20°C and 55–60% relative humidity, in the dark, with gentle air circulation — a small fan on the floor pointed at the wall, keeping air moving in the room without blowing on the buds. That’s it. It’s a different environment from your flowering tent (which runs warmer and drier for bud growth); the drying numbers are tuned for slow, even moisture release. Terpenes are volatile and start evaporating around 21°C, so cool holds the flavour; too hot and you burn it off, too fast and chlorophyll gets trapped before it breaks down — that’s the hay smell. Darkness matters because light degrades THC into the more sedative CBN, so the drying room is not a display case.
How long should drying take?
Ten to fourteen days. If you’re hitting dry in two or three days, the room is too hot, too dry, or both — dial it back, because rushing is exactly how you ruin it. You’re waiting for the moisture locked in the stems and dense bud centres to work its way out slowly and evenly while the chlorophyll breaks down. The done test: stems snap cleanly when bent (not fold, not splinter — snap), and the buds feel dry outside with a slight give when gently squeezed. Crispy outside but spongy inside means it dried too fast — the outer layer sealed before the inner moisture could escape. And here Irish growers actually have an edge: a spare room or wardrobe in an Irish autumn is naturally cool and moderately humid, close to ideal, while someone in a dry climate is fighting to stop their buds turning to dust.
What kills a dry?
Shortcuts and the tent. No oven, dehydrator, microwave or hairdryer — every one destroys in minutes what took months to build, and a quick-dried “test bud” tastes like ruined flower, so you draw the wrong conclusions. The cardinal sin is drying in the grow tent with the light on and extraction on full: the light degrades trichomes, the fan yanks humidity out so buds dry in days, and the heat cooks the terpenes. The tent is for growing; drying happens elsewhere. No spare room? A wardrobe with the doors cracked and a floor fan, a cardboard box with a few holes and string inside, or an under-stairs cupboard with a hygrometer (DIG stock them) all work in a small house. Darkness, gentle airflow, the right temperature, and patience — fancy kit optional.
Common questions
How long does it take to dry cannabis?
About 10–14 days in proper conditions. Faster than that means your space is too warm or dry, and the buds will smell of hay and smoke harshly.
Can I dry cannabis in my grow tent?
Not with the light on and extraction running — that's too hot, too fast and degrades the buds. If you must use the space, turn the light off, slow the airflow right down, and monitor humidity.
How do I know when it's dry enough to jar?
When the thin stems snap cleanly rather than bend, and the buds feel dry outside with a slight give inside. Then move to jars for curing.
