We have found 136 plants that meet your criteria.

Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.95 coming soon
Price Pruned
Allium ‘Allium Globemaster’ Enormous, deep violet globes NOW £5.95 coming soon
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.95 coming soon
Price Pruned
Allium Schubertii ‘Allium Schubertii’ Giant pink starbursts NOW £4.95 coming soon
Angel's fishing rod ‘Dierama Purple Passion’ Dark, delicate bell shaped flowers £7.95 coming soon
Angelica ‘Angelica gigas’ Tall, dramatic burgundy flowers £6.95 Buy
Armenian Cranesbill ‘Geranium psilostemon’ Gorgeous magenta flowers with black centres £5.95 Buy
Arum Lily (syn. Black Star)... ‘Zantedeschia Edge of Night’ Stunning black flowers £7.95 coming soon
Balkan Cranesbill ‘Geranium macrorrhizum Bevan's Variety’ Magenta flowers. Perfect for suppressing weeds £5.95 Buy
Bats-in-the-belfry ‘Campanula trachelium’ Common native hedgerow plant £1.25 Buy
Price Pruned
Beard Tongue ‘Penstemon Raven’ Dramatic, deep purple, foxglove-like flowers NOW £5.45 Buy
Price Pruned
Beard Tongue ‘Penstemon Stapleford Gem’ Luminous, lilac blooms. Long flowering NOW £4.95 Buy
Beard Tongue (syn. Vesuvius) ‘Penstemon Yasius’ Large, deep purple, foxglove-like flowers £5.45 coming soon
Bearded Iris ‘Iris Before the Storm’ Extremely dark, nearly black flowers £6.95 coming soon
Bearded Iris ‘Iris Dusky Challenger’ Huge ruffled silky rich purple-blue blooms £6.95 coming soon
Bearded Iris ‘Iris Provencal’ Burgundy flowers speckled with yellow £5.95 Buy
Bearded Iris ‘Iris Sultan's Palace’ Sultry, maroon flowers £6.95 coming soon
Price Pruned
Bearded Iris ‘Iris Superstition’ Purple-black flowers NOW £5.95 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.45 Buy
Big Blue Lily-turf ‘Liriope muscari’ Purple, wand-like flowers and evergreen foliage £6.95 Buy