I have Carolina Jessamine growing on a trellis up my mailbox. I was wondering if I could grow some clematis up the leggy parts. Will they compete? I already have two clematis plants that aren't happy where they are. I'd like to transplant both at some point anyway. The mailbox is in full all day sun. The clematis that I'd like to use is Petit Faucon (I think!)

Thanks,

Pam