I think it might be a nute burn, but this one plant has gone from vibrant to wilting, having burned tips, and yellowing rapidly in a matter of 3 days. I flushed it with water this morning to try and correct what I believe to be nute burn but I would like some more advice since this is my first grow. Appreciate! I also attached two photos of my biggest sativas . As always any advice is welcome!
What nutrients are you using? It looks like nute burn or nutes are locked. What's your PH at? It looks like an iron deficiency from the light new growth but that could be from the PH being off and the plant can't absorb iron.