A question from a fellow grower:
I have some auto flower plants 5-6 weeks old that were doing well and all of a sudden the large fan leaves are drying up from bottom progressing upward. I had also started fanning plants a couple times a day, my humidity is dry 10% in room. Could dryness and fan be the problem? I watered and fertilized, the PH is at 8 also, but never stopped the problem. Is the PH high enough to also cause this? I read that coffee or vinegar can lower the PH, how much would I use to lower it to 7? I’m not close to city that I can buy any PH up or down solution and also new at this and your advice would help greatly. I’ve attached photo with type of meter. Thanks.