I agree with you except....
Once you have grown for a number of years, THE SAME Strain... you can look, and see, and tell...
Do you think the old time growers check for Tric's ?
I'd say, there is NO WAY for a Newbie to tell, for sure...
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On my strain I grow:
at light change- Pre hairs
one week-buds start
Stretch stop at 3 weeks in 12/12
2-3-4 weeks buds grow bigger and bigger
5 weeks hairs start to change colors and recede, not as shinny, Tric's go from crystal clear to duller
6 weeks plumping buds, clear trics turning to cloudy more cloudy
7 weeks hairs all receded a few white hairs growing mostly cloudy Tric's
8 weeks buds are dense and grow bigger over 90% cloudy
9 weeks first sign's of amber Tric's and I harvest
at the tenth week, I dry for 3.5 days, then start my cure...
I cure for 3.5 days ... then enjoy...
Your results may vary...