Check Muddys' sticky about the life cycle, I check it every grow, if you have been giving bloom nutes since the 3 week mark than the plants are getting ready for harvest. Stop feeding if vertical growth has stoped and flush with plain water and when the bud leaves start to yellow harvest. If you can check tricomes harvest when they are cloudy/amber. If you have several plants harvest at different stages (clear, cloudy, amber) see which you like best. If you let the plant go two or three weeks longer than advertised you will be well rewarded. Good luck and good karma.