What are autoflower cannabis seeds?
Autoflower (or autoflowering) cannabis seeds produce plants that flower based on age, not light cycle. Most autoflowers begin flowering 3-4 weeks after germination and complete their full cycle in 8-10 weeks total. This is a fundamental difference from photoperiod feminized seeds, which only flower when light hours drop to 12. The autoflowering trait was originally bred from Cannabis ruderalis, a wild northern variety that evolved to flower quickly during short Arctic summers.
Why autoflowers are perfect for Canadian outdoor grows
Most of Canada has 90-110 frost-free days between late May and early September. Photoperiod cannabis often runs out of time outdoors — flowering triggered by August light shifts means harvest in late October, after first frost in many provinces. Autoflowers solve this by ignoring the light cycle entirely. Plant in early June, harvest in mid-August. You can even squeeze in a second outdoor cycle if your climate allows. For Quebec, Ontario, Alberta, and Manitoba growers especially, autoflowers are the most reliable outdoor option.
Best autoflower strains for Canadian climates
PPS curates autoflower genetics that handle variable Canadian weather: vigorous root systems for short vegetative periods, resistance to cold nights, and finishing speed under varied light conditions. Indica-dominant autoflowers excel in cool northern climates; sativa-leaning autoflowers tolerate higher humidity in eastern Canadian summers. Use our seedfinder above to filter by experience level, effect, and seed type to match your setup.
How long do autoflowers take from seed to harvest?
Standard autoflowers: 8-10 weeks from germination. Some compact "express" autoflowers finish in 7 weeks; some larger autoflower hybrids extend to 11 weeks. Germination 24-72 hours (paper towel method), vegetative 2-3 weeks, flowering 5-7 weeks. No light schedule changes required — autoflowers thrive under 18/6 or 20/4 the entire cycle. Indoor growers can run continuous staggered cycles for year-round harvests.
Autoflower vs feminized vs fast version
Autoflowers offer the fastest turnaround and the simplest grow with no light scheduling required. Feminized photoperiod seeds yield more but take longer and need light cycle changes. Fast version seeds are feminized photoperiods bred for shorter flowering — they bridge the two, ideal for outdoor growers who want photoperiod yield with finishing speed.
Read more: feminized vs autoflower vs fast version cannabis seeds →
Frequently asked questions
How long do autoflower cannabis seeds take to harvest?
Most autoflowers complete seed to harvest in 8-10 weeks. Compact express autoflowers can finish in 7 weeks; larger autoflower hybrids may take up to 11 weeks.
Do autoflowers need a special light schedule?
No. Autoflowers flower based on age, not light. Keep them under 18/6 or 20/4 the entire cycle for best results. No flip to 12/12 required.
Can I grow autoflowers outdoors in Canada?
Yes — and they thrive. Plant in early June after last frost, harvest in mid-August. The short cycle is ideal for Canadian outdoor growers facing 90-110 day seasons.
Do autoflowers yield less than photoperiod feminized seeds?
Generally yes, due to the shorter vegetative phase. Modern autoflower genetics narrow the gap significantly. Per square foot per month, autoflowers are highly efficient.
Are autoflower cannabis seeds beginner-friendly?
Yes. No light scheduling, no sex identification, and a short cycle make autoflowers ideal for first-time growers.
Can I clone autoflowers?
Technically yes, but it is not recommended. Clones inherit the mother's age, so a clone of a flowering autoflower will be a small, low-yielding plant. Start fresh from seed each cycle.