Posted: 04/03/2016 at 12:37
Is it sunny there Humblebee? If so check out convolvulous maritima a trailer with superb velvety purple blue flowers all summer. Helianthemums....the Wisley varieties like Pink and Primrose have evergreen grey foliage. Another convolvulous, cneorum, has silver foliage and white flowers. Osteospermums like Cannington Roy with pink flowers all summer is delightful.
Something more shrubby consider prostrate lavender....some excellent bright blue varieties out there. keep the hedge side pruned back and allow it to spill over and down the wall