pistils can change color due to temperature, humidity, genetics, etc.. - I totally ignore the pistils :wtf: - the only correct way to determine your harvest is to look at the trichomes - if you don't have a 30x glass, then get one - Radio Shack has an illuminated pocket microscope for about $10 - I harvest when about 10%-20% of the trichs have turned amber - good luck - :smokin: