Baptisia 'Purple Smoke' (Indigo weed 'Purple Smoke'): Tall spikes of violet pea-like flowers on almost black stems, attractive grey-green foliage. Dark-grey seed pods. Hardy. Up to 1.2m

Dictamnus albus var. purpureus (Purple-flowered Dittany): Starry pinkish purple flowers in mid-summer on stiff spikes. Aromatic foliage.

Echinacea purpurea 'Green Twister' (Coneflower 'Green Twister'): A new variety with a unusual mix of purple and lime green flowers with upturned petals and a central dark cone. Hardy. Up to 60cm.

Pulsatilla vulgaris 'Papageno' (Pasque flower 'Papageno'): The petals are deeply dissected, giving a frilled, double effect. Usually purple but can be pink, reddish or white. Hardy. To 30cm

Thalictrum delavayi 'Hewitt's Double' (Chinese meadow rue 'Hewitt's Double'): Tiny purple pom-pom flowers dance airily above ferny grey-green foliage. Height to 1.2m. Hardy