Posted: 21/09/2014 at 23:46
Evergreen and coloured flowers is not so easy to find. Hydrangea Petiolaris is evergreen, but the flowers are white. It also is happy on a Northwest wall, not the sunniest. Roses have lovely flowers, but aren't evergreen and need more attention. Some would need more sun. Honeysuckle is fairly tough and easy. Some clematis have gorgeous flowers, but there are so many sorts, you would do best looking at a site like this one and learning a bit about them. http://www.taylorsclematis.co.uk/
If a plant is sold growing in a pot you can plant it at anytime of the year. Before planting dig the ground and add some compost and a blood, fish and bone fertiliser.