all facts to the side, its more of a preference thing then when exactly the thc is at its highest point.
soil
It is evident that many gladly throw away THC to get more CBN, even though it's more a combination of CBD and terpenoids that they want, trying to increase the stone. So they do it by, number one: reducing THC levels thus making the pot less potent, and two: by increasing CBN which is only mildly psychoactive and causes sleepiness and confusion. They de-tune and then add confusion.
The question is why is that done when they could pick different strains with the combination of cannabinoids and terpenoids that when harvested at peak levels of THC would give people the stone they want.
I think to many people think that harvesting earlier or later is a way to shape everything other than the most extreme opposite types of strains into being whatever they want it to be.
There is a window of opportunity for when a plant will be at it's peak potency. Harvesting earlier or later means you went without some percentage of potency. The key is to find strains that when harvested at peak potency will give someone what they want.
I do not know how many strains there are, especially when you count the genetically different versions of strains with the same name, but there are thousands of them. Most we never hear anything about.
What we hear about is the latest greatest new release by Dewey, Cheatem & Howe Seeds or about some new kid on the block seed company allegedly having the greatest line ever, and I do mean ever.
People are obsessed with new, the newest, the latest, because if it's the latest, it just has to be the greatest!
People assume older strains are crap compared to the 'flavor of the month' strains, but that's not the case. With all the, at very best, redundant mundane genetics that get cranked out for every one really decent strain, there is a lot that comes out that isn't as good, let alone better, than some older strains.
Many people pick the wrong strains for the wrong reasons and then try to make them into what they want them to be. They try to play cannabis plant alchemist by harvesting at various times.
What these people need are strains that are higher in CBD. CBD, as Sam the Skunkman pointed out, has almost totally been bred out of modern strains. (that is until the fairly recent advent of a small number of high CBD strains by groups like The CBD Crew and Project CBD.
To increase THC percentages the allele responsible for what percentage of CBGA would become CBDA to then become CBD has, almost completely in some cases, been bred out of most modern strains.
That means those who love a heavy stone over a powerful head high should try some of the famous older strains that can still be found. The farther back you go, the less the allele for CBDA/CBD was bred out of them.
I really believe that if more people tried more strains, especially a number of the older ones, they would find something perfect for their taste when harvested at peak levels of potency and they wouldn't have to play the, now exactly when should I harvest so things will be the most like I want them to be game.
To me it only makes sense to grow and smoke something that best fits your likes and or needs when harvested at peak potency levels. So what if it happens to be a strain that your parents smoked? If it's right, then it's right and being newer wouldn't make it any better.
More people need to drop their membership in "The Strain of the Month Club" and branch out, stop assuming anything with a little dust on it's name has to be inferior and try strains you never imagined you would try, and I'll bet you find something you absolutely love.