Astrantia major Superstar (syn 'White Giant'), masterwort (syn. White Giant). The large, greenish-white flowerheads look like pincushions surrounded by a spidery ruff of green-tinted, white bracts. These are produced en masse above the lobed, dark green leaves from early summer to autumn adding bobbles of colour to the border. Astrantias have become the 'darlings of the designers' in recent years as they lend themselves to most styles of planting, and mix happily with most plants.
Centranthus ruber 'Albus', valerian. This free-flowering, perennial has slightly fleshy blue-green leaves on upright stems, that are topped with sweetly scented, off white flowers with a pinkish tinge from late spring. Cut back after flowering to encourage a second flush.