Centaurea montana 'Parham' (Perennial cornflower 'Parham'): Large lavender purple fluffy flowers over silvery-green foliage. Very attractive to bees and butterflies. To 40cm.

Erigeron karvinskianus 'Lavender Lady' (Fleabane 'Lavender Lady'): A lavender flowered form of this delicate but robust daisy. Self-seeds around where happy. To 20cm. Hardy.

Geranium wlassovianum: Warm purple flowers over attractive velvety foliage. Excellent autumn foliage colour. To 40cm. [Collect Only]

Penstemon 'Sour Grapes' (Syn. Stapleford Gem): Purple-blue tubular flowers with a metallic sheen and patches of white in the throat. Protect from hard frosts. To 60cm.

Verbena bonariensis: Tall, airy but strong slender stems with flat heads of purple flowers in mid to late summer. To 1.8m. Frost-hardy.