Acanthus hungaricus (Long-leaved bear's breeches): Architectural spires of purple/white flowers over large, dark green deeply divided leaves. Best in sun or light shade. Height to 1.2m [Collect Only]

Agastache 'Blue Boa' (PBR) (giant hyssop 'Blue Boa'): Excellent new form of Agastache with much fatter spikes of vibrant purple-blue flowers, with aromatic foliage. Hardy. Up to 80cm.

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

Campanula Iridescent Bells = 'Iribella' (PBR) (Bellflower 'Iridescent Bells'): Purple buds open to silvery-lilac bells in summer. Prefers a moisture retentive soil. Height to 80cm. Hardy [Collect Only]

Centaurea 'Jordy' (Perennial cornflower 'Jordy'): Beautiful maroon-purple flowers over felty silvery-green foliage.

Centaurea montana 'Parham' (Perennial cornflower 'Parham'): Large lavender purple fluffy flowers over silvery-green foliage. To 40cm. Hardy

Centaurea montana 'Violetta (Perennial cornflower 'Violetta'): Large purple cornflower-like flowers over grey-green foliage. Very attractive to bees and butterflies. Up to 40cm. Hardy.

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. [Collect Only]

Erigeron 'Adria' (Fleabane 'Adria'): Mound forming perennial forming masses of semi-double purple flowers with central yellow disc. Hardy. Up to 60cm.

Erigeron 'Dunkelste Aller' (Fleabane 'Darkest of all'): Large purple daisy flowers over a long season in summer. Great in sunny, dry borders. To 30cm. Hardy

Festuca amethystina: Evergreen grass with elegant, dusky purple arching flower stalks very early in season, for a grass.

Geranium maculatum 'Beth Chatto' (Spotted cranesbill 'Beth Chatto'): Very pretty palest purple flowers held above attractive green foliage. To 50cm. Hardy. [Collect Only]

Geranium maculatum 'Vickie Lynn' (Spotted cranesbill 'Vickie Lynn'): Pale lavender flowers above a clump of fresh green divided leaves. Prefers soil that doesn't dry out in summer. Hardy. Up to 45cm.

Geranium phaeum (Dusky cranesbill): Purple flowers with swept-back petals held high above soft green foliage. Early to flower, reliable and easy. To 60cm. Hardy.

Geranium phaeum 'Lily Lovell' (Dusky cranesbill 'Lily Lovell'): Large, rich purple flowers with white centre. Petals swept back. Hardy. Flowers early in the season. To 80cm.

Geranium phaeum 'Raven' (Dusky cranesbill 'Raven'): Dark purple flowers with long stamens and swept-back petals held high above soft green foliage. Great for shady areas. To 60cm. Hardy. [Collect Only]

Geranium phaeum pale purple (Dusky cranesbill pale purple): Pale purple flowers with swept-back petals held high above soft green foliage. Early to flower, reliable and easy.

Geranium pratense 'Dark Reiter' (Meadow cranesbill 'Dark Reiter'): Dark purple/bronze leaves with single purple flowers in mid-summer. To 40cm. Hardy

Geranium pyrenaicum 'Bill Wallis' (Mountain cranesbill 'Bill Wallis'): Masses of tiny purple flowers, good for ground cover

Geranium wlassovianum: Warm purple flowers over attractive velvety foliage. Excellent autumn foliage colour.

Heuchera 'Midnight Rose': Darkest purple leaves, splashed with bright pink. Excellent for all year round foliage colour. Hardy. Up to 30cm.

Lobelia x speciosa 'Tania': Dramatic spikes of brightest pink flowers in late summer.

Molinia caerulea 'Heidebraut' (Purple moor grass 'Heidebraut'): Elegant flower stalks with slender purple flower heads in late summer. Makes an upright, vase shape. To 1.2m. Hardy

Molinia caerulea 'Transparent' (Purple moor grass 'Transparent'): Deciduous grass with long feathery purple flower spikes. Likes moist but well-drained soil in sun or light shade. Hardy. Up to 1.2m.

Ophiopogon planescapus 'Nigrescens' (Black lilyturf): Jet back strappy leaves and purplish flowers in mid-summer. Widely and rightly used in modern planting schemes against silvery plants and paving.

Penstemon 'Pensham Plum Jerkum': Plum-purple tubular flowers with white throat markings. Semi-evergreen in milder areas. Protect from hard frosts. To 70cm.

Penstemon 'Raven': Darkest purple-red tubular flowers over semi-evergreen foliage. [Collect Only]

Perovskia 'Blue Spire' (Russian Sage 'Blue Spire'): Fine spikes of purple flowers on silver stems. Lovely winter stem effect. Hardy. Up to 1m.

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

Salvia nemorosa 'Amethyst' (Balkan Clary 'Amethyst'): Slender spires of long-lasting warm purple spikes from mid to late summer. To 90cm. Hardy.

Salvia x jamensis 'Nachtvlinder' (Sage 'Nachtvlinder'): Regal purple flowers on upright stems throughout late summer into autumn.

Stachys officinalis 'Hummelo' (Betony 'Hummelo'): Upright spikes of rosy purple flowers above pointed dark green foliage. Very attractive to bees. To 50cm. Hardy.

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

Veronicastrum virginicum 'Lavendelturm' (Culver's Root 'Lavendelturm'): Long, narrow spires of tiny, pale lavender-blue flowers above whorls of narrow, dark green, serrated leaves. Tall to up to 2m.