We have found 33 plants that meet your criteria.

Price Pruned
Allium ‘Allium cristophii’ Huge globes of star-like, lilac flowers NOW £5.99 Buy
Allium ‘Allium hollandicum Purple Sensation’ Rich, deep purple globes £5.99 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris var. stellata Black Barlow’ Striking dark purple, double flowers NOW £4.99 Buy
Armenian Cranesbill ‘Geranium psilostemon’ Gorgeous magenta flowers with black centres £5.99 Buy
Geranium ‘Geranium sylvaticum Birch Lilac’ Great for a woodland setting £5.99 Buy
Price Pruned
West Country Lupin ‘Lupinus Manhattan Lights’ Bi-coloured blooms NOW £6.99 Buy
Price Pruned
Bergamot ‘Monarda Ou Charm’ Pretty, pink flowers and purple bracts NOW £5.49 Buy
Germander ‘Teucrium hircanicum Paradise Delight’ Great tail-like flowers £5.99 Buy
Price Pruned
Yarrow ‘Achillea millefolium Lilac Beauty’ An unusual lilac, yarrow NOW £5.49 Buy
Price Pruned
Columbine ‘Aquilegia McKana Hybrids’ Bonnet-like flowers in a range of colours NOW £4.99 Buy
Price Pruned
Granny's Bonnet ‘Aquilegia vulgaris William Guinness’ Unusual purple-black flowers NOW £4.99 Buy
Michaelmas Daisy ‘Aster novi-belgii Purple Dome’ Masses of violet-purple flowers in late summer £5.99 Buy
Masterwort ‘Astrantia major Rubra’ Gorgeous plum-coloured flowers £5.99 Buy
Price Pruned
Masterwort ‘Astrantia major var. rosea’ Unusual, pale pink flowers NOW £5.99 Buy
Price Pruned
Clustered Bellflower ‘Campanula glomerata Superba’ Rich purple flowers in June NOW £4.99 Buy
Wallflower ‘Erysimum Bowles' Mauve’ Stunning mauve flowers £5.99 Buy
Price Pruned
Dusky Cranesbill ‘Geranium phaeum Lily Lovell’ Iridescent saucers of purple flowers. Good for shade NOW £5.49 Buy
Giant Catmint ‘Nepeta grandiflora Wild Cat’ A giant catmint with deep purple-blue flowers £5.99 Buy
Oriental Poppy ‘Papaver orientale Manhattan’ Beaufitul lavender-rose flowers £5.99 Buy
Price Pruned
Beard Tongue ‘Penstemon Raven’ Dramatic, deep purple, foxglove-like flowers NOW £5.49 Buy