By technicality (if you are trying to get all technical and stuff) it is not for reasons described in this thread. I have worn styles like yours (and still do) and my hair has grown just fine (haven't had a "trim" since September). More than anything, it is how you treat your hair. You know, are you being too rough on your hair and damaging it in some way? You can do all the protective and low manipulating styling you want to, but if you are ripping and tearing out your hair with a comb and yanking out single strand knots and regular knots with your fingers it really makes no never mind in the end.