Short answer. Curing is a slow, steady decline in the bud's moisture, not a constant hold. Jar properly dried buds ¾ full at about aw 0.62–0.65, keep them dark at 15–21 °C (60–70 °F), burp daily in week 1, every 2–3 days in weeks 2–3, then weekly, and let them settle towards aw 0.55–0.58 over 2–8 weeks. Judge the bud with an equilibrated jar reading. Skip humidity packs: if a jar is too dry, add a fresh bud.
What do you need to cure cannabis?
You need airtight jars, a way to read the bud's moisture, and a dark, cool shelf.
- [ ] Airtight glass jars with good seals, enough to fill each about ¾ full (roughly 1 L holds 100–140 g of dry bud, depending on density)
- [ ] One small hygrometer per jar, checked first with a salt test (a damp salt slurry in a sealed bag reads 75 % RH)
- [ ] A dark cupboard or box at 15–21 °C (60–70 °F), away from heaters and sunlight
- [ ] Labels or a marker: cultivar, harvest date, jar date
- [ ] A kitchen scale in grams
- [ ] Your grow journal
- [ ] Optional: a water activity meter, the gold standard (water activity test)
What is curing, exactly?
Curing is slowly reducing the bud's moisture content over time, under control, after drying. The GenetixBay house position is explicit: a steady slow decline gives the best product, not a jar held at one number. Moisture still moving from the stem and core to the surface is spread out and released a little at a time by burping. Smoother smoke and rounder aroma are widely reported, but the chemistry of curing is barely studied, so treat the details as Grower practice (curing and burping).
Why judge the bud, not the jar's air?
Judge the bud because what matters is its moisture content and water activity, not the jar's RH as such. A jar's RH reflects the bud's water activity only once the sealed jar has equilibrated, usually 12–24 h after sealing: then aw ≈ equilibrium RH / 100 [1]. A reading taken right after a burp tells you about room air. ASTM D8197 sets aw 0.55–0.65 as the acceptable range for dry flower [1]; cured flower measured by water-specific methods typically sits around 5–9 % moisture at aw 0.45–0.60, and oven methods read higher [5].
| Stage of cure | Target aw (equilibrated jar RH) | What to do if off |
|---|---|---|
| Jarring day | 0.62–0.65 (62–65 %) | Above 0.65–0.68: out of the jar, dry 12–24 h more [2] |
| Week 1 | 0.60–0.64, falling slowly | Burp 1–2 times a day, 10–15 min |
| Weeks 2–3 | 0.58–0.62 | Burp every 2–3 days |
| Weeks 4–8 | 0.55–0.58 | Burp weekly; then store sealed |
| Any time below ~0.55 | Getting dry and brittle | Add a fresh bud; never a humidity pack |
How do you cure cannabis, step by step?
Cure in this order, starting the day small stems snap at the end of the dry (drying step by step).
- Check the dry is finished. Small stems snap; buds are dry outside with slight give inside.
- Weigh and trim if you chose to dry trim. Log the dry weight.
- Fill jars loosely to about ¾. Don't pack buds down; air space lets moisture even out.
- Put a hygrometer in each jar, seal, and label it (cultivar, harvest date, jar date).
- Leave sealed 12–24 h, then read. 62–65 % is right. Above 65–68 %: take the buds out on a tray or back on the line for 12–24 h and repeat. Below 55 %: see step 10.
- Week 1: burp once or twice a day for 10–15 minutes. Sniff every time. Fresh and sharp is good; ammonia, must or wet grass means too wet: take them out and dry more.
- Gently roll or shake the jar at each burp so buds don't sit pressed together.
- Weeks 2–3: burp every 2–3 days. Read the hygrometer just before opening, when the jar has equilibrated. You want a slow downward drift.
- Weeks 4–8: burp weekly. The reading should be settling at about 55–58 %.
- If a jar falls too dry early, put one fresh, slightly moister bud from another jar into it and reseal for 24 h. That moves moisture back without adding anything foreign.
- After the cure, store sealed jars full, dark and cool (long-term storage). Log the final reading and your tasting notes.
Why no humidity packs?
GenetixBay's house position is that two-way humidity packs are a marketing gimmick that rob terpenes. They are built to hold one RH, which works against the slow decline a good cure needs, and they hide a bad dry instead of fixing it. If you need to add moisture, put a fresh bud in the jar. ASTM notes that salt-based sachets are a means of holding aw below 0.68 [2]; that is a storage convenience, not a curing method. This is house position on Grower practice evidence; GenetixBay members can test it in side-by-side Bay Trials.
Can a cure fix a bad dry?
No. A cure will never fix a bad dry: that is a firm house position. A hay smell means bacteria, over-drying or drying too fast, and it never truly comes out. Volatile monoterpenes lost in a fast, warm dry are gone [3][4]. A long cure may soften harshness slightly, but the time to win flavour is the 7–14 day dry.
What about water curing?
Water curing is Contested and GenetixBay doesn't recommend it. Soaking buds for days before drying removes water-soluble compounds along with aroma, and there's little controlled evidence that it improves anything a good dry and cure don't.
How long should you cure, and then store?
Cure at least 2 weeks and ideally 4–8. Long cures help within reason and then plateau. After that you are storing, and storage is about protection: light is the largest single cause of cannabinoid loss, and oxidation slowly turns THC into CBN, faster when warm [6]. Store full, airtight, opaque or in the dark, at 15–21 °C or cooler, with the bud at aw 0.55–0.65 [1].
How will you know it's working?
You'll know your cure is working when:
- Equilibrated jar readings drift down slowly, a point or two a week, without jumping up after sealing.
- The smell on opening gets louder and more distinct over weeks 1–3, with no ammonia or must.
- Buds feel dry and springy, not crunchy or spongy; small stems snap.
- Smoke or vapour gets smoother between week 1 and week 4, as most growers report.
What mistakes do beginners make when curing?
Beginners mostly jar too wet or try to fix a dry in the jar.
- Jarring too wet (stems bend): ammonia smell, mould risk.
- Reading the hygrometer right after a burp instead of after 12–24 h sealed.
- Packing jars to the lid, so buds compress and can't breathe.
- Using humidity packs to hold a fixed RH.
- Spraying water or adding fruit peel to rehydrate. Use a fresh bud.
- Forgetting to burp in week 1.
- Curing in a warm or bright spot, which speeds terpene and THC loss.
- Expecting the cure to save a hay-smelling, fast-dried harvest.
Evidence
- aw 0.55–0.65 as the safe range; equilibrium RH as its measure: Established standard [1][2].
- Terpene loss on drying and storage: Supported [3][4].
- Moisture content figures for cured flower: Supported (method validation) [5].
- THC to CBN by oxidation and light in storage: Established [6].
- Burping schedule, cure length, smoother smoke: Grower practice.
- Slow decline over constant hold; no humidity packs; a cure never fixes a bad dry: house positions on Grower practice evidence.
- Water curing: Contested.
