I'm OK with my wild invasive varieties (we have Himalayan, cutleaf, plus the little ground blackberries), they grow all over our back woods, and there is no particularly effective way I know of to get rid of them that doesn't involve poison. My husband brush hogs them regularly to keep them in check and I rather enjoy the excuse to wander out back for berry picking in the fall. I agree that the flowers are pretty, and also the fall color, particularly the cutleaf variety (not my favorite for eating):
