In flowering for about 4 weeks and new growth started at the top of the cola on three different bag seed plants. It is under a 50w led grow light, it was a bit close too the plants but even one of the shorter ones did the same thing. There is not much air flow and a general 'potassium rich' synthetic nutrients (3.1.6) has been added to the feed 2 week ago (low doses, and recently increased). Tbh I don't trust the nutrients, but i don't know why.