How Long Does Cannabis Take to Grow? Full Timeline
Cannabis takes roughly 4–6 months from seed to a cured jar for a photoperiod: 1–7 days to germinate, about 2–3 weeks as a seedling, 3–8 weeks of veg (you control this on photoperiods), 8–10 weeks of flower, then 3–4 weeks to dry and cure. Autoflowers are faster — about 8–10 weeks from seed — because they flower on age with no veg decision or flip. Veg length and the dry/cure are the two parts you can shorten or stretch; the finish is the one part not to rush.
“How long does it take?” is the first question almost everyone asks, and the honest answer is a range, because you control part of it (veg length) and genetics control the rest. Here’s the full timeline stage by stage, with realistic numbers, so you can plan a grow around your life.
The short version:
- Germination: 1–7 days
- Seedling: ~2–3 weeks
- Vegetative: ~3–8 weeks (you control this on photoperiods)
- Flowering: ~8–10 weeks
- Dry + cure: ~3–4 weeks
- Total: roughly 4–6 months seed to jar for a photoperiod; autos a bit faster
Want the full breakdown? Keep scrolling.
How long is each stage?
Germination takes 1–7 days — most seeds crack in 1–3, older or tougher ones up to a week. The seedling stage runs about 2–3 weeks, from sprout to a young plant with a few sets of true leaves. Vegetative growth is the flexible part — 3–8 weeks on a photoperiod, because you decide when to flip; veg longer for a bigger plant, less for a faster, smaller one. Flowering is 8–10 weeks for most strains once you flip (sativa-leaning ones can run 12–14). Then drying is 10–14 days and curing at least 2 weeks (4–8 for the best results) — call the finish 3–4 weeks. Add it up and a typical photoperiod is roughly four to six months from seed to a cured jar.
Why do the estimates vary so much?
Two reasons. First, veg length is yours to set on photoperiods — a 3-week veg and an 8-week veg produce very different timelines (and plant sizes) from the same seed. Second, seed-bank flowering times are estimates built on ideal conditions and a little marketing optimism; most strains run a week or two longer in a real beginner’s tent, and you judge the actual finish by the trichomes, not the calendar. In the case-study grow, the packet said “8–9 week flower,” but the trichomes weren’t ready until well past that, and two days of extra patience near the end made a measurable difference to the bud. So treat any single number as a guide, not a promise.
Are autoflowers faster?
Yes, and more predictable. Autoflowers flower on age rather than light, finishing in roughly 8–10 weeks from seed with no veg decision and no flip to manage — so the total grow is shorter and you can’t accidentally stretch it out. The trade-off is less control: you can’t extend veg to grow a bigger plant or recover from an early mistake. If you want speed and a fixed schedule, an auto from a reputable breeder (CSB list both types with grow times) gets you to harvest faster; if you want a bigger plant and full control of the timeline, a photoperiod is worth the extra weeks. Either way, don’t skip the cure to save time — it’s where good bud becomes good bud.
Common questions
How long does it take to grow cannabis from seed to harvest?
Roughly 4–6 months for a photoperiod: a few days to germinate, 2–3 weeks as a seedling, 3–8 weeks of veg, 8–10 weeks of flower, then 3–4 weeks to dry and cure.
Are autoflowers quicker to grow?
Yes — autos finish in about 8–10 weeks from seed because they flower on age with no veg decision or flip. The trade-off is less control over plant size and timing.
Can I speed up the grow?
You can shorten veg on a photoperiod, but flowering and the dry/cure can't be safely rushed. Quick-drying or skipping the cure ruins quality, so the finish is the one part to leave alone.
