We have found 29 plants that meet your criteria.

Price Pruned
Granny's Bonnet ‘Aquilegia caerulea’ A cottage garden favourite NOW £3.99 Buy
Price Pruned
Milky Bellflower ‘Campanula lactiflora Pritchard's Variety’ Masses of bell-like lilac flowers NOW £4.99 Buy
Globe Thistle ‘Echinops bannaticus Blue Globe’ Large globes of dark blue flowers £5.99 Buy
Globe Thistle ‘Echinops ritro Veitch's Blue’ Good for repeat flowering £5.99 Buy
Cranesbill ‘Geranium Spinners’ Wonderful large deep purple blue blooms £5.99 Buy
Siberian Iris ‘Iris sibirica Caesar's Brother’ Intense violet flowers. Great in boggy ground £5.99 Buy
Siberian Flag ‘Iris sibirica Tropic Night’ Violet flowers with yellow throats. Good for boggy ground £5.99 Buy
Catmint ‘Nepeta subsessilis Cool Cat’ Lavender-blue flowers. Great for a herb garden £5.99 Buy
Catmint ‘Nepeta subsessilis Washfield’ Pretty catmint with bright blue flowers £5.99 Buy
Sage ‘Salvia patens’ Large, stunning blue blooms £5.99 Buy
Salvia May Night ‘Salvia x sylvestris Mainacht’ Large indigo-blue flowers £5.99 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 var. stellata Blue Barlow’ Stunning violet-blue double flowers NOW £4.99 Buy
Aster ‘Aster Little Carlow (cordifolius hybrid)’ Pretty violet-blue daisies in late summer £5.99 Buy
Globe Thistle ‘Echinops bannaticus Taplow Blue’ Spherical, bright blue flower-heads £5.99 Buy
Plantain Lily ‘Hosta Gold Standard’ Spikes of lavender-blue flowers £5.99 Buy
Plantain Lily ‘Hosta sieboldiana var. elegans’ Heart shaped, pale green leaves and fragrant flowers £5.99 Buy
Siberian Iris ‘Iris sibirica Flight of the Butterflies’ Pretty violet-blue flowers £5.99 Buy
Siberian Flag ‘Iris sibirica Silver Edge’ Blue flowers edged with white £5.99 Buy
Giant Catmint ‘Nepeta grandiflora Wild Cat’ A giant catmint with deep purple-blue flowers £5.99 Buy