Robertsanswered grow question 2 years ago This could be a few things. Hard to say without more information. It could be over watering, it could be a ph in substrate issue, it could be not enough feed or too much. Going off the little information you left I think it is a ph issue in soil. I think you fed it strong plus dropped the ph causing it to bottom out. Based on the dark green I see on other leaves. What is the ph of the run off water. That is what you need to be watching closely. The plants generally like a higher ph when flowering the vegging. I believe you just did the opposite. .1 ph change is a big difference in roots.