I got this from a question/answer page! This is what is says:
Largely this myth came into existence because of the generalization that all bodybuilders take steroids. Because steroids, especially potent androgens, can close the epiphysial plates. With puberty comes an increase in testosterone, and the androgenic stimulation from that finishes the growth process by fusing these plates. All steroids with androgenic qualities possess this ability as well and hence can stop you from growing. But unless you are using steroids, lifting will not stop your growth. Whether that means you will be 6'2 or 6'3, well, nature and genetics will decide that. Could be more, could be less. Either way, you aren't going to change anything about it.
Unless i am mistaking what I was reading or taking it the wrong way it does say potent androgens can close them!