We have found 91 plants that meet your criteria.

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
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
Plantain Lily ‘Hosta Krossa Regal’ Upright, corrugated, blue-green leaves £5.99 Buy
Everlasting Sweet Pea (syn. L... ‘Lathyrus latifolius Pink Pearl’ Vigorous climber with magenta flowers £5.99 Buy
Giant Catmint ‘Nepeta grandiflora Wild Cat’ A giant catmint with deep purple-blue flowers £5.99 Buy
Price Pruned
Beard Tongue ‘Penstemon Raven’ Dramatic, deep purple, foxglove-like flowers NOW £5.49 Buy
Phlomis ‘Phlomis cashmeriana’ Distinctive whorls of lilac flowers in high summer £5.99 Buy
Perennial Phlox ‘Phlox paniculata Amethyst’ Tall variety with violet flowers £5.99 Buy
Price Pruned
Jacob's Ladder ‘Polemonium caeruleum’ Bell-shaped, lavender-blue flowers in early summer. NOW £4.99 Buy
Salvia ‘Salvia nemorosa Caradonna’ Dazzling purple blooms £5.99 Buy
Sage ‘Salvia nemorosa Ostfriesland’ Attractive to butterflies and bees £5.99 Buy
Stonecrop ‘Sedum telephium (Atropurpureum Group) Purple Emperor’ Fabulous variety with gorgeous deep bronze-purple foliage £6.99 Buy
Lamb's Ears ‘Stachys byzantina Big Ears’ Purple flowers large Grey-green leaves £5.49 Buy
Price Pruned
Meadow Rue ‘Thalictrum aquilegiifolium’ Plumes of pale mauve flowers NOW £5.49 Buy
Verbena ‘Verbena rigida’ Iridescent magenta flower heads £5.99 Buy
Culver's Root ‘Veronicastrum virginicum Lavendelturm’ Long tapering flower spires £5.49 Buy