Cool Clematis to pair with Quadra rose?
I'm planning to plant a Quadra rose at the side of my arbor (4' x 2' x 8' ).
I would like to plant a clematis, which flowers form July to September.
As Quadra is a red rose, I need a clematis, which tones down the red of the rose, i.e. if there is a second flush :)
Also to have flowers on top of the arbor, especially in the July August period, where the garden is in a dozing period.
So, either White, mauve or purple. No pink. Also, I am not a fan of bell typed clematis (like Betty Corning).
I have a list, wondering any of these will fit the bill.
1) Huldine - Clematis on the web suggests it flowers from June till October. Is that true?
2) I am Lady J - I am not sure if it is more on the pink side or purple side.
3) Prince Charles