It39s easy to see why clematis 39rouge cardinal39 is one of the favourite varieties of red45flowered climbers it bears single large velvety red flowers which have contrasting brown anthers and they gradually fade to a purple45rose tone the blooms appear from july to september making a great late summer show this clematis is relatively vigorous and it will do well in a sunny spot this climber looks good on a wall a trellis or growing against an obelisk height 3m 4010