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

Acanthus mollis (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.

Aster laevis 'Arcturus' (Syn. Symphyotrichum laeve 'Arcturus'): Clouds of lilac/purple flowers over almost black stems. Hardy and reliable late summer/autumn flowerer. Hardy. Up to 1.3m. [Collect Only]

Aster x frikartii 'Wunder von Stafa': Long-flowering Aster with light violet-blue flowers in autumn and dark foliage. Mildew-resistant. Bee-friendly. Hardy. Up to 70cm. AGM.

Astilbe 'Amethyst': Large, upright panicles of lilac-purple flowers in summer over green ferny foliage. Excellent for damp or shady spots. Hardy. Up to 80cm.

Astrantia major 'Abbey Road' (PBR) (Hattie's pincushion, Masterwort 'Abbey Road'): Dark violet-purple flowers on dark almost-black stems above green foliage. Long-flowering. Hardy. Up to 80cm.

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

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

Centaurea atropurpurea: Attractive deep-red, almost black thistle like flowers above silvery foliage. Good for bees and butterflies. Hardy. Up to 1m. [Collect Only]

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.

Cirsium rivulare 'Trevor's Blue Wonder' (Brook thistle 'Trevor's Blue Wonder'): Not blue at all, I'm afraid, but a more purplish hued form of the more familiar deepest pink Cirsium rivulare 'Atropurpureum'. Hardy. To 1.5m

Epimedium grandiflorum 'Purple Pixie' (PBR) (Barrenwort 'Purple Pixie'): Unusual reddish-purple flowers with prominent white spurs, held on wiry stems above the heart-shaped leaves. Hardy. Up to 30cm. [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 [Collect Only]

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

Geranium clarkei 'Kashmir Purple' (Cranesbill 'Kashmir Purple'): Rich purple flowers with darker veins above attractive finely divided dark green leaves. Good as ground cover. Hardy. Up to 50cm.

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

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 sylvaticum 'Mayflower' (Wood cranesbill 'Mayflower'): Tall variety of geranium with erect stems of violet-purple flowers with a white centre, above deeply divided leaves. Hardy. Up to 75cm. [Collect Only]

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

Geranium x magnificum (Purple cranesbill): Covered in a mass of rich, violet-blue flowers in early summer. Large, slightly felty leaves. Vigorous but a short flowering season. Up to 70cm.

Hosta 'Big Daddy': Lovely large blue-green leaved Hosta, with some puckering to the leaves. Large clump-forming. Lilac flowers in summer. Hardy. Up to 60cm. [Collect Only]

Hosta 'Fireworks' (PBR): Gleaming ivory leaves with multi-hued green leaf edge markings. Very upright habit. To 50cm. Hardy.

Hosta 'Frances Williams': Large heart-shaped crinkled leaves with a prominent green-yellow margin. Lavender purple flowers in mid summer. Hardy. Up to 75cm.

Hosta 'Patriot': Large green leaves cleanly edged in white. Lilac flowers in summer. To 50cm. Hardy.

Hosta 'Praying Hands': Very upright, rippled leaves. Leaves are green, narrowly edged in white and curl up. Lilac flowers in summer. Hardy. Up to 40cm. AGM.

Hosta 'Sum and Substance': Large, bright green leaves. lavender flowers, good in shade or sun. Hardy. To 60cm high and wide. [Collect Only]

Iris 'Langport Wren': Sword-shaped glaucous green leaves and stems of up to 4 flowers, with rich reddish-purple and deep maroon almost brown flowers. [Collect Only]

Kalimeris yomena 'Shogun' (Japanese Aster): Lavender, daisy flowers above attractive variegated leaves. Flowering late summer. Prefers full sun/moist soil. Hardy. Up to 60cm. [Collect Only]

Liatris spicata 'Kobold' (Gayfeather 'Kobold'): Plump spikes of purple flowers in mid to late summer. Likes dryish soil in a sunny spot. To 80cm. Hardy [Collect Only]

Liriope muscari '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

Liriope muscari 'Royal Purple' (Blue turf lily 'Royal Purple'): Spikes of deep purple flowers in autumn above dark-green evergreen strappy foliage. Can tolerate dry shade. Hardy. Up to 50cm.

Lobelia x speciosa 'Hadspen Purple' (PBR): Dramatic spikes of purple flowers in late summer, above lance-shaped purple flushed leaves. Needs damp soil in summer. Hardy. Up to 60cm.

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

Lythrum virgatum 'Dropmore Purple' (Wand loosestrife 'Dropmore Purple'): Upright spikes of purple-pink flowers in the mid-summer with lance-like foliage. Prefers a moist soil. Hardy. Up to 1m.

Molinia caerulea 'Edith Dudszus' (Purple moor grass 'Edith Dudszus'): Purple, almost black wand-like flower stalks with slender purple flower heads in late summer.To 90cm. Hardy

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. [Collect Only]

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.

Papaver orientale 'Patty's Plum' (Oriental poppy 'Patty's Plum'): Huge sultry, antique bronzey purple flowers held above green hairy leaves

Penstemon 'Pensham Czar': Bright purple flowers with white throat. Very long flowering - up to five months, especially if regularly dead-headed. To 50cm. Frost hardy.

Penstemon 'Raven': Darkest purple-red tubular flowers over semi-evergreen foliage.

Phlox paniculata 'Eventide' (Phlox 'Eventide'): Mauve-purple, scented flowers on erect stems and green lance-shaped leaves. A good vigorous selection. Hardy. Up to 90cm. AGM [Collect Only]

Primula 'Wanda' (Primrose 'Wanda'): Low growing primula with bright purplish red flowers in early spring

Primula denticulata (Drumstick primula): Round heads of purple, occasionally white flowers above a rosette of green leaves.

Salvia nemorosa 'Caradonna' (Balkan Clary 'Caradonna'): Rich purple spikes in early summer - just in time for Chelsea Flower Show at which is widely used.To 50cm. Hardy

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

Thalictrum 'Elin' (Rue 'Elin'): Tallest of the Thalictrums we grow with huge heads of lavender and yellow flowers in mid-late summer. To 2m. Hardy. [Collect Only]

Thalictrum rochebruneanum (Meadow rue): Airy sprays of lavender flowers with yellow stamens on tall purple-tinged stems. To 1.4m. Hardy [Collect Only]

Veronica spicata 'Purpleicious' (Spiked speedwell 'Purpleicious'): Spikes of dark-purple flowers over a mound of shiny green leaves. Long-flowering and excellent as a cut flower. Hardy. Up to 50cm. [Collect Only]

Veronicastrum virginicum 'Fascination' (Culver's Root 'Fascination'): One of the best cultivars with tall tapering spires of warm purple/blue flowers in mid-summer. To 1.8m. Hardy. [Collect Only]

Vinca minor 'Atropurpurea' (Small periwinkle 'Atropurpurea'): A compact mat-forming evergreen perennial with trailing stems of dark green leaves and dark purple flowers. Good in shade. Hardy ground cover.