Huh, thats a good one, idk. What is its usual flower time? If week 6 out of like 9 it very well could just be growing especially if there are whites generally throughout the buds top and bottom. I guess I dont understand foxtails that much, that one I showed also had like what looked like 3 different molds growing in it including budrot.
It just kept foxtailing until dimmed light but triggered stress hairs where it was just budding nonstop. You could tell by larf buds that it was a badly foxtailed plant. Buds overall just had that never ending bud build structure sometimes normal but not that plant.
Then I had stress hairs later on in my perpetual clone grows pretty often from gnats then aphids too. Root rot as a result. So my 8-10wk pheno was 12wks and still pushin white hairs. Like it needed 14 wks. Partly also because I lacked plant training so had many larf buds with no light so that didnt help. It didnt stop it from being 100% orange hairs in a other tent though.
Hope that helps, so in short, if its known to go 10wks give it 11 or 12 and if its still pushin out whites.. And you know you have some potential causes then consider chopping with mostly red hairs. I would tweak the setup tho and refer to notes try to figure out what went wrong. For next time. If you ran it a few times from seed.
Between seeds they can have a different harvest date because of that and even as clones, I have a 4 week window. I grew it for almost 2 yrs too. If its just the tops and they are growing that crown you saw in my example pic, thats a good sign to confidently chop. I was told those can go on indefinetly if not corrected or chopped if it just kept going.
Or else LOL if just turns into my picture which didnt intend to be such a extreme example available to find and show. Its up there with some of the most extreme ever seen. And its my plant lol.