Hey GC this is my first grow and until now everything has been running pretty smooth. I transplanted my plants into bigger pots about four days ago (foxfarm soil) and made sure my ph was good. Over the past few days ive observed a rust color on the lower leaves (especially the veins) which is now working its way up my plant. Its only on the bigger fan leaves so far, but i'm afraid it will start affecting the rest of the plant. My ph is at about 6. Can anyone help me? Ill try to post pics later tonight...
I have outdoor plants, but I had the same problem. Buy some epsom salt and mix a spoonfull of it in water and feed it to your plant a few times. That should clear it up. It did for me.