Blackberry bushes not producing berries
I know there are several kinds of blackberry bushes, but does anyone know if ALL blackberry bushes....say, the ones that Canadian (i.e. Ontario) garden centres sell, only produce berries on one year-old canes? From what I've read, they produce canes one year, then those canes produce berries the following year, then die, then new canes emerge. Is this the case? My friends bushes aren't producing berries and I believe they just planted them 2 years ago, so I am trying to figure out why this may be. Thanks very much for your help with this.