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 semi auto di fast buds di possono dividere in 2 fenotipi ,le diversita' sono molte ma generalmente io la divido in fenotipo sativo o indico... ho fatto alcune piante enormi da 150gr e altre molto piu piccole o medie le piu grosse hanno anche allungato i tempi mentre quelle piu piccole i tempi li rispettano quindi piu tempo e piu resa..... se vogliamo parlare di qualita' le piante piu piccole sono piu gustose ma sto parlando di lievi sfaccettature che riesci a capire provandole insieme

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