Flowering Time length?
Once the trichomes start to change to gold, the THC begins to break down, lowering the potency of the weed... If you want lower potency, grow a lower THC weed and harvest it when you should-- you get it faster!
You need to know what strain you are growing. If it is bagseed, then you need to figure out whether it is indica (fat leaves, usually shorter plants) Sativa (Big plants with thinner leaves) or a cross...
Know what to look for, the trichomes-- NOT the size of the buds, or their smell, or the color of the hairs (those often change WAY before harvest due to other factors!)
Indicas go from (on average)50-65 days of flowering (after they start blooming!)
Sativas can go anywhere from 75-120 days depending on the strain (breed)
Crosses are in the middle of the 2..
Know what to look for to harvest, and start checking around day 50...
at 75-85% cloudy with a few clear, they are usable, but early, and will be trippier: but not fully potent...
At almost all cloudy (just a very few clear ones) They are at their peak and will be as described by the breeder for that strain...
At ALL cloudy and a few "going amber" They will be at more of a couchlock, but are just beginning to degrade- potency should not be effected.
After this point, it degrades, and you lose potency, essential oils begin to break down and change the flavor, and the buds may begin to "fluff up"... not to mention that many strains will begin to hermie if flowered too long.
Another member recently posted the photo's below--
they will help you!