We have found 107 plants that meet your criteria.

Monkshood ‘Aconitum Sparks Variety’ Deep violet hooded flowers on tall stems £6.99 coming soon
Hollyhock (Althea) ‘Alcea rosea Nigra’ Deep burgundy flowers £5.49 coming soon
Price Pruned
Round-headed Leek ‘Allium sphaerocephalon’ Small, wine-coloured flowers on tall stems NOW £5.49 coming soon
Angel's fishing rod ‘Dierama Purple Passion’ Dark, delicate bell shaped flowers £7.99 coming soon
Pride of Madeira ‘Echium candicans’ Dramatic purple spikes in early summer. Drought tolerant £5.99 coming soon
Tower of Jewels ‘Echium pininana’ Enormous spikes of blue flowers £6.99 coming soon
Joe Pye Weed ‘Eupatorium purpureum Atropurpureum’ Majestic and late-flowering £5.49 coming soon
Bearded Iris ‘Iris Dusky Challenger’ Huge ruffled silky rich purple-blue blooms £6.99 coming soon
Bearded Iris ‘Iris Sultan's Palace’ Sultry, maroon flowers £6.99 coming soon
West Country Lupin ‘Lupinus Masterpiece’ A new purple variety £6.99 coming soon
Price Pruned
Phlox ‘Phlox divaricata subsp. laphamii Chattahoochee’ Masses of lilac flowers. Perfect in partial shade NOW £5.49 coming soon
Pincushion Flower ‘Scabiosa atropurpurea Ace of Spades’ Gently fragrant they make good cut flowers £5.99 coming soon
New
Cobra Lily ‘Arisaema speciosum’ A wonderfully exotic looking plant £6.99 coming soon
New England Aster ‘Aster novae-angliae Violetta’ Beautiful deep purple flowers £6.99 coming soon
Michaelmas Daisy ‘Aster novi-belgii Purple Dome’ Masses of violet-purple flowers in late summer £5.99 coming soon
Price Pruned
Masterwort ‘Astrantia major var. rosea’ Unusual, pale pink flowers NOW £5.99 coming soon
Price Pruned
Delphinium ‘Delphinium Black Knight Group’ Spikes of dark purple flowers with black centres NOW £5.99 coming soon
Balkan Cranesbill ‘Geranium macrorrhizum Bevan's Variety’ Magenta flowers. Perfect for suppressing weeds £5.99 coming soon
Sweet Rocket ‘Hesperis matronalis’ Lilac flowers. Perfect for a wildlife garden £5.49 coming soon
Siberian Iris ‘Iris chrysographes’ Deep purple flowers. Gorgeous beside water £6.99 coming soon