Clematis 39royal ladies duo39 offers two varieties of old man39s beard both of which will grow into beautiful climbing plants when planted at the base of a wall fence trellis or pergola from june to september clematis 39princess kate39 and clematis 39princess diana39 produce beautiful bell45shaped blooms in shades of white and pink respectively once these flowers fade and the season ends the hardy perennials can be cut back to ensure easy maintenance clematis