uhm...quick question.
how many plants did you have going.
from the sound of it you put all your efforts into growing only a couple plants, probly from seed. hell when i intend on growing 4, i germinate 16 seeds. some die, some turn out to be male, some get a weird nutrient def and die that way or just die from somthing falling on them or somthing stupid. just because a plant dies, doesnt neccesarily mean its your fault, it could have been a weak one and just keeled over. go back to the board and try it again, it'll be well worth it in the end
grow big or go home