As part of our Great Garden Revamp of 2012 I am in the middle of constructing a pergola in the shady bottom corner of our garden. Two sides will be bounded by north and East facing walls and the idea was to find some flowering climbers for the opposite sides. I can't find anything to fit. I like the look of an evergreen clematis but they flower March/May and we want summer flowers. I also like the look of tree lilies in the brochures but have never seen them in the flesh and don't know whether they'd need more care than they'd get.
Soil is on the pH neutral/alkali side, but is a good loam. We get plenty of rain here in S Gloucestershire, so nothing that'd rot, please.
I'd be very grateful for any suggestions.