Hey man , my plants did the same thing when i was first starting out , the leaves started turning yellow towards the bottom of the plant and leaves were falling off ! But theres a way to fix em, but u gotta get 20-20-20 , it has a red label and isnt miracle grow but similar , if your growing outdoor save the 15-30-15 untill your plants start flowering (in late August when the days start getting shorter) and then use it . aight pce