What do the triches look like ? I am betting they are all clear. I really think that
the trichomes are a much better indicator of where you plants are. There is a certain amount of controversy around this. I have experienced friends who base most of their decision on when to pull on the color of the pistils. I just don't see it. It doesn't matter if your pistils are red and in flames. If your trichomes are clear you'll get a mild, heady high at best. The pistils have no effect on the potency of the plant.
The Reef