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🎁 10 FREE seeds with orders over $420 · Free shipping over $200 · Germination guaranteed
Autoflowering seeds begin flowering on their own after about three to four weeks, whatever the light does. They are the fastest, most forgiving way to grow cannabis in Canada.
Autoflower marijuana seeds are cannabis seeds that begin flowering automatically after about 3 to 4 weeks, regardless of the light schedule. They carry Cannabis ruderalis genetics from northern climates, finish in 8 to 10 weeks from sprouting, and usually stay between 60 and 100 cm tall, which makes them the fastest option for Canada’s short outdoor season.
Last updated: July 2026
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Standard cannabis is photoperiod dependent: it only begins flowering when daily light drops toward twelve hours. Autoflowers carry genetics from Cannabis ruderalis, a subspecies from harsh northern climates that evolved to flower on age rather than light. Your plant simply starts budding when it is ready.
You never change a lighting schedule and never risk stunting a plant by mistiming the switch. Outdoors that means planting in June and harvesting in August, well before frost, and in many regions running two crops in one summer.
Autoflowers do not wait for you, so a lost week is a lost week. Plant directly into the final container to avoid transplant shock, feed lightly, and avoid heavy training such as topping. Low stress training, where you gently tie branches outward, is the safer way to open the canopy. Keep them under 18 to 20 hours of light indoors throughout.
They suit first-time growers, anyone short on space, and experienced growers wanting a quick harvest between photoperiod runs. To maximise yield per plant instead, see our feminized seeds; for a calm, low-THC harvest see auto CBD seeds.
Every MJ Seeds Canada order includes: a germination guarantee, plain discreet packaging with no cannabis branding, and 3 to 7 day delivery from Vancouver, BC to every province and territory. Pay by credit card, Interac e-Transfer or Bitcoin, with free shipping over $200.
| Seed type | Starts flowering | Seed to harvest | Plants produced | Best for |
|---|---|---|---|---|
| Feminized | Light cycle (12/12) | 9 to 16 weeks total | Female only | Biggest yields per plant |
| Autoflower | Age, about 3 to 4 weeks | 8 to 10 weeks total | Female only | Speed and short seasons |
| Regular | Light cycle (12/12) | 9 to 16 weeks total | Male and female | Breeding and mother plants |
| High CBD | Depends on variety | 9 to 14 weeks total | Female only | Low THC, clear-headed |
| Fast Version | Light cycle (12/12) | 8 to 12 weeks total | Female only | Full yield, earlier finish |
| Auto CBD | Age, about 3 to 4 weeks | 8 to 10 weeks total | Female only | Easiest low-THC grow |
Times shown are typical ranges from seed to harvest and vary with strain, climate and setup.
Most autoflowers go from sprout to harvest in 8 to 10 weeks. Because flowering is triggered by the plant’s age rather than the light cycle, that timeline stays fairly predictable whether you grow indoors or outdoors.
No. Autoflowers flower on their own, so most growers simply leave the lights on 18 to 20 hours a day for the entire cycle. There is no switch to 12/12 and no risk of stunting a plant by changing the schedule at the wrong time.
In many regions, yes. Because autoflowers finish in about two months, growers who plant in late May or early June can harvest in August and run a second crop that finishes before the first frost, depending on local climate.
Per plant, usually yes, because autoflowers stay smaller and have a fixed vegetative window. Growers offset this by harvesting sooner and more often, and by growing several compact plants rather than a few large ones.
Autoflowers are one of the most forgiving starting points because there is no light-cycle management and no males to remove. The main rule is to plant directly into the final container and avoid heavy training such as topping, since the plant cannot wait to recover.
The autoflower seeds sold by MJ Seeds Canada are feminized, so they produce female, bud-producing plants. Autoflowering and feminized describe two different traits: one is about what triggers flowering, the other about the plant’s sex.
