The auto seed scene is riddled with this.
Seed to harvest in 70 days!!! Bullshit in 90% of cases.
Sweet Seeds autos are they only company I’ve ran autos from that finish close to what they say. They have 7 week autos all the way to 18 week autos advertised. They don’t seem like they are trying to bullshit you.
My experience with autos (every breeder) aswell has always been that out of a pack of 10, at least 1 will just need significantly longer than the rest. The genetics never seem as stable as I want autos to be. So if you’re just popping one seed you may get that outlier.
But Sweet Seeds have plenty strains that will finish in under 10 weeks from seed. I like their “+Speed” auto, 7-8 weeks from seed, perfect for growing in the corner of my veg room and ready and chopped by time I need the space for potting up the regulars.
Any fast auto like this is going to be small plants though. Under 3ft total height. Often very small. And while not bad yields for the time, the 8 weeks is limiting.
If you get an auto that grows tall before into full flower. It’s going to be 12 weeks + in my experience.
I tried Mephisto and 10 weeks advertised turned into 14+ weeks for the entire 10 pack. Bollocks to that bullshit.