Any idea why 1 plants is so behind on the others?

If that ducting is the cold air induction that might be where your problems ly you might have a cold spot in there. if pushing fresh air in like you should be anyway.

Yeah, the run before my current one, same strain one was a few weeks behind the other, and this run I have 2 same strain as first run. This time both of them sprouted literally the same hour of the other. If you look at them now one looks like a week or 2 behind.

Thankyou all, I will just have to harvest at different times. 🙏 I have a separate tent for drying but this will delay the next batch. All a learning curve. Thanks 😎🙌🙌

Different strains = different durations. I dry in my grow tent so try and keep the same strain in there otherwise it messes with my harvest time.

I can divide the Fast Buds semi-autoflowering strains into 2 phenotypes; there are many differences, but generally, I split them into sativa or indica phenotypes... I've grown some huge plants that yielded 150g and others that were much smaller or medium-sized. The bigger ones also took longer to flower, while the smaller ones stick to the expected time. So, more time means more yield... If we want to talk about quality, the smaller plants are tastier, but I'm talking about subtle nuances that you can only understand by trying them together.

Different strains take Different times. Plus environment will make a difference. Longer generally means bigger yield.

Different strains can vary in time it takes to start and end flower. Sometimes even the same strain can vary by a week or two from plant to plant