What causes leaves to brown and curl? I am growing a Girl scout cookie from Nirvana Seeds and a Gold Leaf from ILGM, photoperiods in coco coir, with organic dry amendments. I am also using RO water which I supplement with cal mag once a week, and also feed molasses once a week as well. But during flower phase, the leaves turn brown and wilt. I am using a SPIDER FARMER SF-4000 LED Grow Light in a 4X4 grow tent. I am wondering what am I doing wrong? Please if anyone knows I would really appreciate the guidance.
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Looks like light burn. More info: https://www.mrgrowit.com/post/light-burn-light-stress-in-cannabis-plants
I'd say the light is to close, also watch for potassium deficiency, Coco is the worst for it and shows most in flower. I've tried dry amendment in Coco and gave up because it was to tough to control the nutrients without starving or overdosing.
My light is about 14 inches away. After some research, I think you are correct.
How close is your light looks like light burn or heat burn have a heater close to them?