I'm mid way through week5 flower but am thinking is it only really week 4 flower I started counting the days as soon as I switched to 12-12 should I have waited until I seen first white hairs then start counting the weeks from there
It is up to you.
Personally I count from when the first pistils appear, but others will count from the day the light cycle was changed.
Cheers, Organoman.
I start counting when the wisp of pistils start forming. It to me puts me about right with the breeders timeline for flowering days. Hope this helps you