there is a point when they pass potency .look at the trichomes (crystals)if they're not fully formed it's prior to peak, if they're fully developed then they're at optimum potency and if the crystals are turning brown and breaking off it's past peak.

A good rule is if you think it's ready give it another week to be sure but, also if your pistils are around %50-%75 brown then it should be ready good luck.:thumbsup: