Posted: 22/08/2016 at 15:30
roses do have to be grafted or grown from cuttings to get the same cultivar (cultivated variety). I think if you get a named rose it will be the right one unless they get the labels mixed.
Cultivars from other plants have to be grown from cuttings, divided or grafted to get the same cultivar but they also produce seed. The plants grown from these seeds are not the same as the original plant. Even if they look very much like it they are still not the original cultivar and shouldn't be sold as such. But they are.