Seedheads and stems of grasses, perennials and shrubs including Deschampsia cespitosa, Calamagrostis 'Karl Foerster' Veronicastrum virginicum, Salix gracilistyla 'Melanostachys' and Salix alba subsp vitellina 'Yelverton' in the Piet Oudolf borders at RHS Wisley Gardens. © Jo Whitworth