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

Osmunda regalis (Royal Fern): Majestic deciduous fern growing up to 2.5m with impressive fronds which change to red-brown in autumn. Prefers a moist soil. Hardy.

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