Clematis: I need CLEMATIS help!!!, 1 by Kell

Kell wrote:
I have 5 arbors that have roses on them. I have read how clematis look great climbing along with the rose. Is this true? I do not want to cover the rose blooms or have it look messy.

Any clematis rebloom or do all bloom just once?

Are the fancy doubles not as floriferous?

Which ones flowers the most?

My biggest arbor has 2 roses on it Night Owl and Berries 'n' Cream. So I was thinking of a purple clematis on one side and a pink on the other.

Any ideas??? THANKS for your help.

Pics from Edmunds site.