Hornbeams, pleached (trimmed to create a hedgelike effect) help to enclose the space while creating a firm sense of perspective. Below them, the blowy shapes and delicate colors of Iris germanica 'Jane Phillips' and Iris sibirica 'White Swan,' along with pink dianthus 'Mrs Simkins' and lavender at the front, contrast the rigor of the traditional Cotswold dry-stone walls (visible on the far side of the yew).