Like its namesake clematis 39princess diana39 or 39the princess of wales39 is strong dignified and beautiful the hardy climber is easy to maintain as it is pruned back almost to ground level annually however this variety of old man39s beard is best known for its tulip shaped flowers which appear throughout the summer their bright pink petals are complemented by honey coloured stamens providing a colourful addition to cottage gardens patio containers trellises and obelisk