Clematis are grouped for pruning needs, Pinkbubbless66. Here's an informative article that explains the differences
http://garden.org/ideas/view/g... .
Most clematis are quite winter hardy; in fact, they usually won't do well at all if their roots are planted in a hot spot. Once you decide on a plant and bring it home, consider placing it on the north or east side of the rose, and allow it to grow through its supporting canes. Plant it deeply and mulch it heavily year-round and you should have no major difficulties.
I think your idea sounds fabulous!
