We have found 55 plants that meet your criteria.

Meadow Rue ‘Thalictrum delavayi’ Mauve-blue flowers purple stems £5.49 Buy
Angelica ‘Angelica gigas’ Tall, dramatic burgundy flowers £6.99 Buy
Price Pruned
Columbine ‘Aquilegia McKana Hybrids’ Bonnet-like flowers in a range of colours NOW £4.99 Buy
Granny's Bonnet ‘Aquilegia vulgaris William Guinness’ Unusual purple-black flowers £5.49 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
Clustered Bellflower ‘Campanula glomerata Superba’ Rich purple flowers in June £5.49 Buy
Price Pruned
Milky Bellflower ‘Campanula lactiflora Loddon Anna’ Soft lilac flowers on tall stems NOW £5.49 Buy
Foxglove ‘Digitalis purpurea’ A native foxglove £1.25 Buy
Balkan Cranesbill ‘Geranium macrorrhizum Bevan's Variety’ Magenta flowers. Perfect for suppressing weeds £5.99 Buy
Price Pruned
Dusky Cranesbill ‘Geranium phaeum Lily Lovell’ Iridescent saucers of purple flowers. Good for shade NOW £5.49 Buy
Armenian Cranesbill ‘Geranium psilostemon’ Gorgeous magenta flowers with black centres £5.99 Buy
Geranium ‘Geranium x magnificum’ Larger sized violet-blue flowers £6.99 Buy
Lenten Rose ‘Helleborus x hybridus Harvington Shades of Night’ Early spring flowers in shades of deep purple £9.99 Buy
Price Pruned
Harvington Hellebore Double ‘Helleborus x hybridus Harvington Smokey Double’ An absolute double stunner! NOW £10.99 Buy
Harvington Hellebore ‘Helleborus x hybridus Smokey Blue’ Unusual, dark purple flowers with a deep blue sheen £9.99 Buy
Plantain Lily ‘Hosta (Tardiana Group) June’ Luminous, blue-green leaves splashed with lime £5.99 Buy
Plantain Lily ‘Hosta fortunei var. aureomarginata’ Large, bright green leaves with creamy margins £5.99 Buy
Price Pruned
Plantain Lily ‘Hosta Francee (fortunei)’ Olive-green leaves with smart white margins NOW £4.99 Buy
Plantain Lily ‘Hosta Halcyon’ One of the bluest hostas £5.99 Buy