clematis 'M. Koster'

'M. Koster' is a climber 2-4m high, with green leaves, and flowers, 7-14cm across, composed of four or six, often twisted, deep rose-pink to red-purple sepals, the tips and edges curving backwards, and pale yellow or yellow-green anthers on paler filaments, from late summer to early autumn; many clematis are visited by bees for pollen, and some also provide nectar