@InspireMe,That may be a possibility, I'm using a bloom nutrients for the entire grow, which is low in N, however they started showing pistils at 2 weeks so its possible the N requirement of the plants was quite low after flowering began and maybe a little too much N built up in the medium due to not enough run off during watering. Increasing calcium did make a difference, runoff ph was good. All in all I'm thinking its due to the lower nutrient requirement and early flowering characteristics of this particular strain. I did have a similar thing occur with another early flowering auto strain. It will be interesting to see if the increased runoff makes a difference on the next grow. Thanks for sharing your experience and happy growing.
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