Crambe cordifolia: Huge sprays of white flowers over large, rhubarb-like leaves in early to mid-summer. Up to 1.5m. Hardy.

Digitalis purpurea 'Alba' (White foxglove): Pure white flowers on tall spires in late spring. Biennial so keep and re-sow the seed

Leucanthemum x superbum 'Wirral Supreme': Tall form of Shasta daisy with white flowers and multiple shorter petals around the golden centre, making an attractive frilly effect. Hardy. Up to 1.5m.

Selinum wallichianum (Wallich milk parsley): Stately umbellifer with large white heads atop large lacy leaves. Hardy. To 1.5m

Thalictrum aquilegiifolium (French meadow rue): Fluffy heads of pale pink or white flowers in early summer