Thanks for your explanation, Zuzu. I don't have gallicas (yet), but now I'll be monitoring my roses which produce suckers easily like Rose de Rescht and Therese Bugnet because they are own-rooted.
So, in generally, roses that lack of vigour are good to be grafted right? I'm asking because I have a poor Little Grey Pearl has few (almost not) growth. I've tried fish emulsion, alfalfa, and some other organic stuff, but it seems all the efforts are nothing else but just keep it "alive". I hope I can find a grafted one and try it again.