i will harvest around the middle of october or the end of september. you must look at the plant to really be able to tell. the best way is to clip a small trichome covered leaf off and look at it under a microscope. the tricomes will look like mushrooms, and will change from clear, to milky white, to amber. the best time to harvest is when most of the trics are milky and some are amber. however, you can also tell, although not as accuratly, by looking at the individual flowers. the plant will almost stop producing new flowers and begin to thicken up, and the pistoles will turn red and shrivl as the pod begins to swell like a seed was growing in it.