We have found 79 plants that meet your criteria.

Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Price Pruned
Allium ‘Allium Globemaster’ Enormous, deep violet globes NOW £5.99 coming soon
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Allium Schubertii ‘Allium Schubertii’ Giant pink starbursts £4.99 coming soon
Armenian Cranesbill ‘Geranium psilostemon’ Gorgeous magenta flowers with black centres £5.99 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 £5.49 Buy
Beard Tongue ‘Penstemon Stapleford Gem’ Luminous, lilac blooms. Long flowering £5.49 coming soon
Beard Tongue (syn. Vesuvius) ‘Penstemon Yasius’ Large, deep purple, foxglove-like flowers £5.49 coming soon
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.49 Buy
Price Pruned
Big Blue Lily-turf ‘Liriope muscari’ Purple, wand-like flowers and evergreen foliage NOW £5.99 Buy
Cardoon ‘Cynara cardunculus Cardy’ A fabulous architectural plant £5.99 Buy
Catmint ‘Nepeta x faassenii Kit Cat’ A dwarf variety with purple flowers £5.99 Buy
Catnip ‘Nepeta racemosa Walker's Low’ Long flowering period £5.99 Buy
Chives ‘Allium schoenoprasum’ Edible leaves and purple, button flowers £3.99 Buy
Clustered Bellflower ‘Campanula glomerata Superba’ Rich purple flowers in June £5.49 Buy
Price Pruned
Columbine ‘Aquilegia McKana Hybrids’ Bonnet-like flowers in a range of colours NOW £4.99 Buy
Price Pruned
Coneflower ‘Echinacea purpurea Magnus’ Copes well with adverse weather conditions NOW £5.99 Buy
Cranesbill ‘Geranium pratense Midnight Reiter’ Unusual deep purple foliage £5.99 Buy
Price Pruned
Dalmatian Bellflower ‘Campanula portenschlagiana’ Vigorous and low-growing NOW £4.99 Buy