Yeah dude pick up a 30x microscope from radio shack and when the triches turn like milky and amber color then harvest them ladies. Thats for peak harvest. Or if you just want to checkk to make sure at least 60 or so percent of the hairs have turned then that works also. And if using soil then just use distilled water with about 80 percent runoff. Make sure its distilled and not tap water cause tap has calcium and shit in it. Better yet just pick up clearex and flush 1 week prior to harvest