Finsfananswered grow question 6 years ago That sucks, but maybe try dipping in clonex just to helptry and root it? Outta the box thinking lol,but worth a shot if you really wanna save it. Spraying the leaves with some nitrozyme always helps for sure.
It could be too late, but I think it's either nutes, or the soil you're using. Is it "too hot" by chance? When growing autos, start with 1/4 dose nutes TOPS! Theycan't handle what the photo's can. That may have been the original problem. If u try it, lmk how it goes.