So here’s the thing about my first autoflowering grow: I killed half of it by week three. Overwatered, burned the roots, and then made it worse by adding nitrogen because the plants looked yellowy and I diagnosed the wrong problem. They recovered, sort of, but those plants never quite got back to where they should have been. Harvested at week 10 and the buds were decent but not what the strain was supposed to produce.
I kept growing autos anyway. That’s the part I want to explain.
My second run was Northern Lights Auto from Royal Queen Seeds. This one I didn’t screw up. Germinated directly into a 12-liter fabric pot — which is the main thing I changed from run one, no more transplanting — and just used plain water for the first 18 days. By week 4 it was already showing pistils. Week 9 I started flushing. Harvested at 10.5 weeks and the buds were exactly what I’d been hoping for: dense, heavy, that deep earthy-hash smell that good Northern Lights is supposed to have. The high was genuinely impressive. Real body stone, lasted 3-4 hours, I fell asleep on my couch at 9pm which I take as a compliment.
If you want to know about Northern Lights genetics specifically — the actual history of where this strain came from — northernlightsstrain.com is worth reading. Bred in the Pacific Northwest in the 80s, refined in Amsterdam, shows up in the lineage of basically half of modern indica breeding. The auto version keeps the important stuff.
Okay so why am I even writing this.
I have a friend named Marco who grows exclusively autos on a 6-square-meter terrace in Barcelona. Every time I visited him in previous years I sort of pitied his setup. He had these little plants, compact, nothing impressive-looking. Then in October 2024 he mentioned casually that he’d done four harvests that year. From April through October. Four. While I was wrapping up my one outdoor photoperiod grow that had just gotten hit by a mold problem in the last week of flowering and I was going to lose a significant chunk of it.
Four harvests. I had to sit with that for a second.
The reason autos can do this: they flower based on age, not light schedule. Around week 3-4 from germination, they start producing flowers regardless of what the daylight hours are doing. So Marco starts a batch in late March when it’s warm enough, harvests mid-June. He’s already got another batch going that started in May — those come down in August. Third batch July, down in late September. The math works out.
I’ve started doing a smaller version of this. Currently running three plants from different autoflowering seed strains at different stages so I always have something finishing. It’s weirdly satisfying.
The genealogy of why autos exist is interesting if you care about that stuff. Cannabis ruderalis is this scrappy subspecies from Siberia and Kazakhstan that evolved automatic flowering as a survival mechanism — the season there is too short to wait for 12-hour nights. Breeders started crossing it into cannabis in the early 2000s. Early results were pretty rough, potency was low, yields were small. There’s a reason serious growers dismissed autos for a long time.
But 20 years of breeding programs later, you have Auto Gorilla Glue testing at 26% THC at independent labs. You have Auto Wedding Cake with dense, complex buds that rival plenty of photoperiod grows. I’m growing Wedding Cake Auto right now — week 7, smells like vanilla and something slightly spicy, buds are building up nicely. Leafly has good community reviews on Wedding Cake if you’re trying to figure out if the high profile suits you.
One strain I want to mention specifically because I see it underrated: Auto Sour Diesel. The original Sour Diesel is famous partly for being incredibly slow — photoperiod plants need 10-12 weeks of flowering on top of however long you veg them. The auto version gets you that distinctive fuel-lemon smell and the energetic, creative high in a 10-week total crop from seed. It’s not quite identical to a full photoperiod Sour D but it’s closer than most people expect. sourdiesel.com has grower notes on what to expect from the effect profile if you’re a fan of that strain.
And Auto Blueberry is worth trying at least once just for the smell. When you get a good phenotype — and with reputable breeders you usually do — the terpene profile is genuinely blueberry-yogurt. Not a metaphor. It fills the room. The Blueberry strain reviews on allbud.com go back years and people consistently talk about the same thing. It’s one of those strains where the description is actually accurate.
The thing I wish someone had told me early: autoflowering plants punish early mistakes way more than photoperiod plants do. When you’re growing a photoperiod plant and you screw something up in week 2 — overwater, burn with nutrients, whatever — you can extend the vegetative period to let the plant recover before you flip to flowering. You have control over the timeline. Autos don’t give you this option. The clock runs whether you want it to or not. My first run was never right because of what I did in week 2 and there was nothing I could do about it at week 7.
So be careful early. Plain water for the first couple weeks. Germinate in the final container — no transplanting, ever, the stress costs you days you can’t recover. Wait until you’re sure the soil has dried before watering again. The droopiness that looks like thirst is usually the opposite. These aren’t suggestions. They’re the difference between a good harvest and a mediocre one.
For growing in smaller spaces — balconies, terraces, closets — autos are genuinely ideal in a way that photoperiods aren’t. Most auto strains stay under a meter, usually well under. You’re not dealing with a 2-meter plant that’s threatening to outgrow your setup. The strains section at seedbanks.com breaks things down by expected height and grow time, which is useful when you’re working with limited vertical space.
And if you’re new to autos and trying to figure out which seeds to actually buy, the feminized seeds section also has a bunch of feminized auto crosses from different breeders. It’s worth comparing a few before deciding — different breeders have genuinely different approaches to the same genetics.
One last thing: source matters. I’ve gotten seeds from discount sites that barely germinated and clearly weren’t what the label said. The difference between FastBuds, Dutch Passion, Barney’s Farm — breeders with actual selection programs running for 10-15 years — and some random operation selling “premium auto genetics” is real. It shows up in germination rate, genetic consistency, and whether the plant actually does what it’s supposed to. Check the seedbank reviews on seedbanks.com before ordering somewhere you’ve never used.
For outdoor growers in northern Europe — UK, Germany, Netherlands, Scandinavia — look for strains with specifically short finish times. Around 8-9 weeks from the start of flowering, so 11-12 weeks total from seed. You need to be done before October. The outdoor cannabis seeds section has options specifically suited to shorter seasons.
Marco told me last week he’s going for five harvests this year. I think he’s being optimistic but I also thought four was impossible so I’ve shut up about it.