just a question how would you now if its nitrogen toxicity???ec?ppm ? On the top of your plant just looks to me like heat stress like you said? i have a wedding cake auto that the edges of the leaves were curled up but thats all. but i would bet that she could bounce back .. You know what now...
hey i live in az aswell and i've noticed using a humidifier has cooled down my small 2x4 grow room dunno if that would help your situation being that certainly are probably trying to keep the humidity down & also i hooked and vent hose directly to my Ac venting then directing it into the tent...
