My leaves are folding in half along the edges about 1/16"-1/8" looks like they were perfectly ironed. Starts with a little browning,sorry bad pics. I have been treating with potassium bicarbonate about every 10 days my sour d strain has systemic P.M. have been keeping it at bay for the last three grows love my sour. Temps are btwn 60-75 deg in room,ph is dialed at 6 its well water doesn't seem to change no matter what I do to it. Rh is high but have plenty of circulation.I never noticed this before just curious to know about it I'm just about 9 weeks in flower was shooting for 12 we'll see.Any info appreciated.