Posted: 13/03/2013 at 23:14
Trachelospermum jasminoides or star jasmin is evergreen, white flowers, smells wonderful. This article says it may need winter protection but mine survived -17° and snow last year. The leaves went a bit brown and a lot fell off, but by summer they'd all grown again and it hasn't lost any this winter.
There is also clematis armandii and hydrangea petiolaris, which are quite vigourous. Is it in sun or shade?