We have found 121 plants that meet your criteria.

Siberian Flag ‘Iris sibirica Silver Edge’ Blue flowers edged with white £5.99 Buy
West Country Lupin ‘Lupinus Persian Slipper’ Pretty lagoon blue blooms £6.99 Buy
Giant Catmint ‘Nepeta grandiflora Wild Cat’ A giant catmint with deep purple-blue flowers £5.99 Buy
Price Pruned
Catmint ‘Nepeta Six Hills Giant’ A hardy catmint with lavender flowers NOW £4.99 Buy
Russian Sage ‘Perovskia abrotanoides’ Silvery white aromatic foliage with long lasting blue flowers £7.99 Buy
Price Pruned
Russian Sage ‘Perovskia atriplicifolia Little Spire’ A shorter form of the popular Russian sage NOW £5.99 Buy
Price Pruned
Jacob's Ladder ‘Polemonium caeruleum’ Bell-shaped, lavender-blue flowers in early summer. NOW £4.99 Buy
Sage ‘Salvia officinalis’ A good companion plant £3.99 Buy
Purple Sage ‘Salvia officinalis Purpurascens’ Attractive red-purple young leaves £4.99 Buy
Price Pruned
Pincushion Flower ‘Scabious caucasica Clive Greaves’ A long-flowering blue scabious NOW £5.49 Buy
Comfrey ‘Symphytum Hidcote Pink’ Great for a woodland garden £4.99 Buy
Speedwell ‘Veronica austriaca subsp. teucrium Royal Blue’ Slender spires of sky blue flowers £5.99 Buy
Speedwell ‘Veronica gentianoides Robusta’ A vigorous variety £5.99 Buy
Price Pruned
Culver's Root ‘Veronicastrum virginicum Fascination’ Elegant spires of bluey-mauve blooms NOW £5.49 Buy
Price Pruned
Greater Periwinkle ‘Vinca major’ Elegant blue-violet flowers NOW £4.99 Buy
Greater Periwinkle ‘Vinca major Variegata’ Large, bright blue flowers £4.99 Buy
Lesser Periwinkle ‘Vinca minor’ Superb ground cover £5.99 Buy
Lesser Periwinkle ‘Vinca minor Argenteovariegata’ Creamy-white leaves £5.99 Buy
Price Pruned
Periwinkle ‘Vinca minor Illumination’ Brand new introduction NOW £5.99 Buy
Price Pruned
Viola (syn. Viola Boughton Blue)... ‘Viola Belmont Blue’ Masses of violet-blue blooms NOW £4.99 Buy