This beautiful clematis is a real head-turner. A sport of 'Kiri Te Kanawa', it has double flowerheads made up of relatively slender, pointed-tipped sepals, each with a green base surrounding a boss of burgundy-red anthers. These are produced in abundance throughout the summer and their colouring is sublime - mixing particularly well with dark purple and plum. Relatively compact, 'Princess Charlotte' will also grow well in a large patio pot.