Hello, I know this is not strictly a propagation question, but I figured if someone knows about prop'ng roses they can maybe help. In my 'new to me' garden there is a well established species rose (I assume a rugosa). From below the soil the is what would be a sucker, but it looks like a cultivated rose. I thought that a species rose would have been used as a rootstock, not the other way around. Is it possible that it has just been left for such a long time that the species has taken over as the shrub? Or are the instances where a cultivated rose is used as a rootstock? I want to prune this winter and not sure how to proceed with this dilemna! Any help would be appreciated!