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]

Liriope 'Big Blue' (Blue turf lily 'Big Blue'): Spikes of vibrant purple flowers in autumn, larger than the usual form, evergreen strappy foliage. Good for dry shade. Hardy. Up to 50cm

Verbena officinalis 'Bampton' (Vervain 'Bampton'): Attractive plant with dark purple foliage and upright, wiry stems with delicate purple flowers. Long flowering. Up to 90cm. Hardy.