I have seen roses growing out of blackberry patches. Whats hard around here is having no black spot
just pinch it off when you see it and throw it in a plastic bag in your trash
or get a disease resistant variety
this one is the same age in the ground planted right next to the other one and never has black spot
both have good if different white flowers for most of summer, more so when its not as dry as its been
i got both at the Washington park arboretum