GMSgrowsanswered grow question 4 years ago Brown spots and yellowing leaves is usually a sign of not enough nutes. But why? Not enough nutes or too much nutes and salt build up in the the root zone. So when you see this start you go back how much was I feeding, water feed, water feed or feed every time. Soil can take a little higher ppm but less often than soiless, or hydroponics. Soiless or hydroponics doesnt need as much but need more often. So what to do, flush and re feed at a lower ppm and watch how she reacts, if things get worse after a while then you know it isnt overfed so increase you next feed and watch. Take notes for your next run. Hope you figure this out