What week in flowering does she start producing thc

Trichs usually begin to appear at about 24 days and that is where THC is made, very little until about 6 weeks.
 
I got mine tested in week 8/9, but trichomes surface by week 5, I suppose you get get it tested as early as that. I am going to do that for plants as I check the ratio of thc to cbd. Not interested in the total % as that comes later on
 
When the trichome heads begin to appear milky in a microscope that is when you have THC. Usually the last 2 or 3 weeks of bloom is when the most THC will be developed.
 
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