Sounds like lockout, possibly K lockout, from bad pH. You are on the right track now- pics asap, but the other thing is that I'd watch for tipburn since you just cranked up your fert strength. I like that canna stuff. It's user friendly!
stinkyattic Reviewed by stinkyattic on . Still having unknown plant problemsa Hi guys, Iv just started flowering my 4-5 week old plants to find a female for cloneing for smoking (not sure yet) and iv noticed that my bottom leaves were turning a rusty/bronze/brown on the tips and working its way up the leaves. Also a few little patches appearing in the middle of some lower leaves. Now the thing is i was using a bad ph tester and i was under the impression it was around 7 and when i tested it today with a digital tester it was 3.8. So iv drained the resevoir and Rating: 5