Autoflower Cannabis Seeds in Canada

How to choose autoflower seeds for a Canadian grow

Autoflowers start flowering by age, not by day length. That is why they suit Canada so well. Plant after the last spring frost and you can harvest before the first autumn one, and indoors the lights can stay on 18 hours a day from seed to harvest. The trade-off is size: autos stay smaller than photoperiod plants and yield less per plant. They suit balconies, short seasons and growers who want a harvest without managing a light schedule.

The fastest autos we carry

Listed flowering times across our autoflower strains run from 7 to 13 weeks. For the shortest seasons, start with the quickest:

Product pages list flowering time, THC and genetics where the breeder publishes them, so you can compare strains side by side.

When to plant outside

Put autos outside once frost is no longer a risk: around mid-May in southern Ontario, earlier on the BC coast, and late May to early June on the Prairies. A plant started then is usually finished by late August or early September, ahead of autumn rain and frost. Where the season is long enough, some growers fit in a second run by starting again in early July.

Growing autos indoors

Autos do not need a switch to 12 hours of light. Most growers run 18 hours on and 6 off from seed to harvest. An autoflower's growing window is fixed, so avoid anything that stalls it: start seeds in their final container where you can, and go easy on heavy pruning.

Autoflower or feminized?

Choose autoflowers for speed, simplicity and short seasons. Choose feminized photoperiod seeds when you want bigger plants and more control over size and timing.

Where you can grow

Every province except Quebec allows adults to grow up to four plants per household, and Manitoba requires them to be indoors. Our guides for Ontario, British Columbia, the Prairies and Atlantic Canada cover local rules and frost dates.

What comes with your order

• Packs of 3, 5, 10 or 20 seeds. Most strains are $39 for 3, $55 for 5, $105 for 10 and $180 for 20.
• Orders over $99 ship free. Orders over $100 get 10 free seeds, and orders over $200 get 20, added before you pay. A single 10-pack clears both.
• Every pack is covered by our 90% germination guarantee. If fewer sprout, send your order number and a photo through the chat on this site and we replace them.

Autoflower seeds: common questions

What is the fastest autoflower you carry?

Critical Kush Autoflower and White Widow Autoflower list the shortest flowering time in our range, 7 to 8 weeks. Afghani, Granddaddy Purple, Pineapple Express, Purple Punch and Cream Autoflower list 7 to 9 weeks. These are breeder estimates for the flowering stage, so add the first few weeks of growth for the full run from seed.

Are autoflower seeds less potent?

Not necessarily. Early autoflowers were weak, but listed THC across our autoflower strains runs from 15% to 30%, and 42 of the 58 strains with a published figure list 20% or more, including Mendo Breath Autoflower at 30% and Star Killer and Honey OG Autoflower at 28%. What autos give up is plant size and yield per plant, not strength.

Can you grow autoflowers outside in Canada?

Yes, where your province allows outdoor home growing. Plant after the last spring frost and most autos finish by late August or early September, ahead of autumn frost and rain. Our provincial growing guides list local frost dates and rules.

Do you ship autoflower seeds across Canada?

Yes. Canadian orders ship by Canada Post in plain packaging and usually take 5 to 7 business days. Orders over $99 ship free.

Catalogue details checked October 2026.