One of the darkest flowered of all clematis is clematis 39rasputin39 which has deep violet blooms with a velvety appearance they have furrowed sepals and undulating margins creating unusual flowers which are borne in profusion from july to september a position in light shade produces the very darkest colour of blooms and these team beautifully with paler flowering varieties of clematis or climbing roses height 3m 40103941 spread 1m 4033941 pruning group 3