Drying: The Slow Part You'll Want to Rush

What You Need to Know

After I chopped that first harvest ten days early, I made it worse. I wet-trimmed every leaf off because the buds looked tidier, hung them naked in the tent with the exhaust on full and the light on, and four days later the outsides were crispy, the insides were still damp, and the whole lot smelled like a freshly mown lawn. I jarred them anyway, because I’d waited months and wasn’t waiting any more. A week later: hay. Three months of careful work thrown away in the final 72 hours because I couldn’t slow down at the finish line.

If I could tell first-grow Dave one thing, it wouldn’t be about nutrients or light. It would be this: the drying room matters more than the grow room. Everything you’ve built can be destroyed in four days of bad drying. And good drying asks for almost nothing — just the right conditions and the patience to leave things alone.

The 60/60 rule — and why slow is the whole point

The anchor numbers: roughly 60% relative humidity and 18–20°C (call it 60/60 — high-teens Celsius, around 60% RH), in darkness, with gentle air circulation — air moving in the room, not blowing on the buds. A small fan on the floor pointed at the wall, keeping the air from going stagnant. That’s the whole setup.

This is a different environment from your flowering tent (20–26°C, 45–50% RH, optimised for bud growth). Drying is optimised for slow moisture release, and slow is the entire point. Here’s why:

• Terpenes are volatile — the compounds that give your flower its smell and flavour start evaporating at temperatures as low as 21°C. Dry too hot and you burn them off. The 18–20°C window threads the needle: cool enough to preserve terpenes, warm enough that moisture still moves out through the stems.
• Chlorophyll needs time to break down. That green pigment that powered the plant through veg needs to degrade, or the bud tastes like a hedge. Dry too fast and the chlorophyll gets trapped before it breaks down — that’s where the hay smell comes from.

Too slow has its own risk: cold, humid, dead-still air invites mould. The gentle fan prevents the dead spots where moisture sits. But in Ireland, too-fast is far more common than too-slow.

How long, and how to tell it’s done

Target: 10–14 days. Not four. Not a week. If you’re hitting the dry point in two or three days, your room is too hot, too dry, or both — dial it back. The stems should snap cleanly when you bend them, not fold and not splinter. The buds should feel dry on the outside but still have a slight give when you squeeze gently. Crispy outside and spongy inside means it dried too fast — the outer layer sealed before the inner moisture could escape evenly.

No shortcuts. No oven, dehydrator, microwave, or hair dryer. Every one of those destroys in minutes what you spent months building. And the cardinal sin — the one I committed and see at the counter constantly — is drying in the grow tent with the light on and the extraction running. The light degrades the trichomes, the extraction pulls humidity out faster than any dehumidifier (drying in days instead of weeks), and the heat from the light pushes past the terpene-survival range. The tent is for growing. The drying happens somewhere else.

Dry-trim vs wet-trim

Two schools, and people get passionate about it in a way that suggests they haven’t enough going on.

Wet trim: cut the plant and immediately trim off all the fan and sugar leaves while fresh. Faster, neater — the scissors glide through soft leaves. But you’ve removed every protective layer between the bud and the air, so it dries faster. Too fast. Wet trim plus a fan equals hay, every time.

Dry trim: take down the big fan leaves (they come off regardless — minimal trichomes), but leave the sugar leaves on. Hang the whole branches, let them dry with the sugar leaves in place, and trim to final shape once dry. Slower and messier — dried sugar leaves are papery and crumble. But those leaves act as a humidity buffer, slowing the moisture loss and keeping terpenes intact. Better flavour, smoother smoke, more complex aroma.

For a beginner with one or two plants in a small tent, dry trim is the answer. You’re processing a few hundred grams, not fifty pounds — the extra trimming is an evening’s work, and the difference in the final product is the difference between something you’re proud of and something that smells like a barn.

Seb’s Corner — why Ireland has the advantage here

Drying is the one stage where the Irish climate works for you. A spare room or wardrobe in an Irish house in autumn is naturally cool and moderately humid — you’re sitting close to the 18–20°C, ~60% RH target before you do anything. A grower in Arizona is fighting 20% ambient humidity, watching their buds turn to dust in two days and reaching for humidifiers and humidity packs to slow it down. You have the opposite, easier problem: hold the slow dry steady and keep the air gently moving.

No spare room? Low-tech works. A wardrobe with the doors cracked and a small floor fan. A large cardboard box with a few holes punched in the sides, branches hung inside on string — sounds ridiculous, works surprisingly well. A cupboard under the stairs with a hygrometer inside so you can monitor without opening the door every hour. The kit is optional. Darkness, gentle airflow, the right temperature range, and patience are not.

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How To Apply This

1. Dry somewhere that isn’t the tent. Spare room, wardrobe, box, or under-stairs cupboard — dark, cool, gently ventilated.
2. Hit 60/60. ~18–20°C, ~60% RH, darkness, a small fan pointed at the wall (never at the buds). Hang a hygrometer where the buds are.
3. Dry-trim, not wet-trim. Pull the big fan leaves, leave the sugar leaves on, trim to shape once dry.
4. Space the branches. Leave a hand’s width between them. Packed branches trap moisture in the middle and mould at the contact points. Two batches beats one mouldy line.
5. Aim for 10–14 days. Test by bending a stem — it should snap, not fold. Bud dry outside with slight give inside.
6. No shortcuts, ever. No oven, no hair dryer, no drying with the light on and extraction running.

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Watch Out For

The Rusher. Dries in four days with a fan on the buds. Crispy outside, damp inside, chlorophyll trapped, hay smell, harsh smoke — months of work for flower that tastes like a wet Tuesday. Slow is the point.

Drying in the tent. Light degrades trichomes, extraction over-dries in days, heat burns off terpenes. Like leaving good wine open on a sunny windowsill. Dry elsewhere.

Wet-trimming a beginner harvest. Stripping the sugar leaves removes the buffer that keeps the dry slow. For a small grow, dry-trim is worth the extra evening.

Packing the drying line. Branches jammed together like a charity-shop coat rail dry unevenly and mould in the middle. Give them space.

Light degrading the dry. Resist checking on them with the light on every few hours. Light converts THC to CBN. The drying room is not a display case.

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Quiz

1. What are the rough target temperature and humidity for drying, and why is this different from the flowering tent?
2. Why does drying too fast produce a “hay” smell?
3. How long should a proper dry take, and what’s the physical test for “done”?
4. What’s the key difference between wet-trim and dry-trim, and which is recommended for a beginner with a small harvest, and why?
5. Why is drying in the grow tent with the light and extraction running the “cardinal sin”?

Answer key:

1. ~18–20°C and ~60% RH (the 60/60 anchor). Flowering conditions (20–26°C, 45–50% RH) are optimised for bud growth; drying is optimised for slow moisture release, and slow preserves terpenes and lets chlorophyll break down.
2. Drying too fast traps the chlorophyll before it can break down, and that trapped green pigment is the hay/cut-grass smell.
3. 10–14 days. The stem should snap cleanly when bent (not fold, not splinter); the bud is dry outside with slight give inside.
4. Wet-trim removes the sugar leaves immediately (dries fast); dry-trim leaves them on as a humidity buffer (dries slow). Dry-trim is recommended for beginners — the slower dry protects terpenes and gives smoother, more flavourful flower, and the extra trimming is only an evening’s work at small scale.
5. The light degrades trichomes, the extraction over-dries the buds in days instead of weeks, and the heat pushes past the temperature where terpenes survive — all three ruin the harvest at once.

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Sources

• Grower’s Guide, Chapter 5 (Harvesting and Curing) — drying conditions, the 10–14 day target, wet vs dry trim, small-space Irish drying setups.

Next lesson: Curing — Where Good Bud Becomes Good Bud, where patience itself is the technique.