Outdoor cannabis seeds that finish before autumn: strains from our own breeding that are ready to harvest outdoors by the end of September — feminized seeds for big plants, fast-flowering strains for short summers and autoflowering seeds for balconies and two harvests a season. Direct from the breeder in Barcelona, with a germination guarantee and discreet shipping to the UK, Europe, the USA, Canada and worldwide.
When you grow outdoors in a temperate climate — the UK, northern and central Europe, Canada or the northern US — one thing matters more than anything else: the plant has to be ripe before rain, cold and mould arrive in October. That is why this category only includes strains from our own breeding that are harvested outdoors by the end of September — feminized seeds, fast-flowering strains and autoflowering seeds. Late sativas that only ripen in October are deliberately left out.
“Outdoor seeds” are not a separate type of seed but a selection: strains whose flowering time and growth suit the climate they grow in outside. In Spain, Italy, California or the US South almost any strain ripens outdoors. In the UK, northern Europe, Canada and the northern US the season is shorter — from mid-October it turns wet and cold, and dense buds quickly start to mould in constant damp.
Good outdoor weed seeds for a short season therefore have three things in common:
All the seeds in this category come from our own breeding in Barcelona. Feminized seeds produce practically 99% female plants.
Three types of seed suit outdoor growing in a short season. They differ in when the plant starts to flower and how big it gets.
| Seed type | Flowering starts | Outdoor harvest (short season) | Size and yield | Ideal for |
|---|---|---|---|---|
| Feminized seeds | when the days get shorter (late July/August) | September — 1st to 4th week depending on the strain | big plants, the highest yield per plant | a garden in full sun, one big harvest a year |
| Fast-flowering seeds | with the shorter days, but a shorter flowering phase | earlier than the original strain, usually early September | big plants, a safer harvest in cool regions | northern regions, uplands, short summers |
| Autoflowering seeds | automatically after a few weeks, regardless of day length | about 50–70 days after germination — possible from July | compact, 70–220 g per plant | balcony, terrace, discreet growing, several runs |
Autoflowers outdoors: autoflowering strains are especially practical in a short season because the harvest does not depend on the autumn. Sow in late April or May and you harvest in July or August — and can still start a second run in summer. More in our autoflowering cannabis seeds category.
| When | Feminized and fast | Autoflowering |
|---|---|---|
| April | germinate the seeds indoors, raise seedlings on a windowsill or under a light | from late April sow straight into the final pot, bring it indoors on frosty nights |
| Mid-to-late May (after the last frost) | move the plants outside | sow outdoors, plants grow fast |
| June – July | vegetative phase: the plant gets big, training is possible | flowering and first harvest, start a second run by early July |
| August | flowering starts as the days get shorter | harvest of the first run or flowering of the second |
| September | harvest — every strain in this category | harvest of the second run |
Eight strains from our breeding that reliably ripen outdoors in a short season — from the early indica to our best seller:
90% indica, 20–22% THC. Ready outdoors in early September, 0.5–1.5 kg per plant. Robust and easy-going.
80% indica, 23–25% THC. Harvest in early September, 0.5–1 kg per plant outdoors.
Our best seller: 60% sativa, 26% THC. Ripe outdoors in mid-to-late September — the latest strain in this selection, for sunny, warm spots.
22% THC, 48 days of flowering under LED. Outdoor harvest in the 1st–2nd week of September.
The fast version of our best seller: 26% THC, 53 days of flowering. Made for short summers outdoors.
70% indica, 20–22% THC, 48 days of flowering. Makes an earlier outdoor harvest possible in a short season.
20–22% THC, about 70 days from germination to harvest, 70–200 g per plant. Sow in April or May.
19% THC, only 50–55 days to harvest, 70–220 g per plant. Ideal for two runs a season.
| Strain | Seed type | THC | Outdoor harvest |
|---|---|---|---|
| Alpujarreña | feminized, 90% indica | 19% | 1st week of September |
| Northern Lights | feminized, 90% indica | 20–22% | early September |
| Anesthesia | feminized, 90% indica | 20–22% | 1st–2nd week of September |
| Super OG Kush | feminized, 80% indica | 23–25% | early September |
| Shark | feminized, 80% indica | 22% | 1st–2nd week of September |
| Tutankhamon | feminized, 60% sativa | 26% | mid-to-late September |
| Tutankhamon Fast | fast-flowering (feminized) | 26% | earlier than Tutankhamon |
| Galaxy Fast | fast-flowering (feminized) | 20–22% | early September |
| Auto Northern Lights | autoflowering | 20–22% | about 70 days after germination |
| Auto Galaxy | autoflowering | 20–21% | about 60 days after germination |
| Auto American Pie | autoflowering | 19% | 50–55 days after germination |
| Auto Tutankhamon | autoflowering | 21–25% | about 70 days after germination |
Please note: Pyramid Seeds sells cannabis seeds as collectible items, and the growing information on our site is for educational purposes only. Whether you may germinate seeds and grow plants depends on the law in your country, and the rules differ widely — please check the regulations that apply where you live before growing.
In a short season, strains that ripen outdoors by the end of September: indica-dominant feminized strains such as Northern Lights, fast-flowering strains and autoflowering seeds. Late sativas with an October harvest are risky in the UK, northern Europe or Canada.
Germinate and raise them indoors in April, then move them outside from mid-to-late May, after the last frost. Flowering starts in August and the harvest is in September (northern hemisphere).
Autoflowers are safer and more flexible: the harvest comes about 50–70 days after germination, regardless of the autumn weather, and two runs a season are possible. Feminized strains give bigger plants and a higher yield per plant in return.
It depends on the strain, the sun and the size of the pot. According to the strain description, Northern Lights yields 0.5–1.5 kg per plant outdoors, autoflowering strains such as Auto American Pie 70–220 g. Strains with the biggest harvests are in our high-yield seeds category.
Climatically, yes — with the right strains: early indicas, fast-flowering strains or autoflowers that are ready before the October rain, a sunny, airy spot and a rain cover for wet spells. Whether growing is permitted depends on the law where you live.
Choose early-harvesting strains, use an airy spot, don’t place plants too close together and put up a cover during long spells of rain. More in our guide Bud rot and cannabis mould.
Yes — discreetly, with no reference to the contents, to the UK, Europe, the USA, Canada and worldwide. Orders ship within 24 hours after payment is received, and shipping becomes free above a threshold that depends on your country (for example €65 to the UK). Details: Delivery information.
Choose your strain above: feminized for the big September harvest, fast-flowering for short summers or autoflowering for balconies and two runs a season. You buy direct from the breeder — our own genetics from Barcelona since 2002, a germination guarantee, free seeds with every order from €15 and discreet shipping to the UK, Europe, the USA, Canada and worldwide.
