We have found 94 plants that meet your criteria.

African Lily ‘Agapanthus africanus’ Globes of blue flowers in late summer £5.99 Buy
Price Pruned
Mexican Giant Hyssop ‘Agastache Blue Fortune’ Spires of lilac flowers and aromatic leaves NOW £5.49 Buy
Price Pruned
Bugle ‘Ajuga reptans Atropurpurea’ Good groundcover for shade NOW £4.99 Buy
Aster ‘Aster Little Carlow (cordifolius hybrid)’ Pretty violet-blue daisies in late summer £5.99 Buy
Michaelmas Daisy ‘Aster turbinellus’ Sprays of violet blue flowers £5.99 Buy
Michaelmas Daisy ‘Aster x frikartii Monch’ Lavender-blue, daisy flowers £5.99 Buy
Lesser Catmint ‘Calamintha nepeta subsp. nepeta Blue Cloud’ Aromatic leaves and blue flowers £5.99 Buy
Price Pruned
Milky Bellflower ‘Campanula lactiflora Pritchard's Variety’ Masses of bell-like lilac flowers NOW £4.99 Buy
Price Pruned
Hardy Plumbago ‘Ceratostigma willmottianum’ Excellent red autumn foliage NOW £4.99 Buy
Price Pruned
Delphinium ‘Delphinium Cupid’ Pale sky blue flowers with a white eye NOW £7.99 Buy
Price Pruned
Delphinium ‘Delphinium Gillian Dallas’ Stunning mauve-blue flowers with a white eye NOW £7.99 Buy
Price Pruned
Delphinium ‘Delphinium Langdon's Orpheus’ Pretty, iridiscent blue-mauve flowers NOW £7.99 Buy
Globe Thistle ‘Echinops bannaticus Blue Globe’ Large globes of dark blue flowers £5.99 Buy
Sea Holly ‘Eryngium x zabelii Jos Eijking’ Spiny metallic-blue flowers in late summer £7.99 Buy
Cranesbill ‘Geranium Brookside’ Deep blue flowers and long flowering seasons £5.99 Buy
Cranesbill ‘Geranium himalayense Gravetye’ Large, purple-blue flowers with reddish centres £5.99 Buy
Cranesbill ‘Geranium Johnson's Blue’ Elegant blue flowers, good for groundcover £4.99 Buy
Cranesbill ‘Geranium Philippe Vapelle’ A mass of light sky-blue flowers in June and July £5.99 Buy
Meadow Cranesbill ‘Geranium pratense Mrs Kendall Clark’ Plenty of charming first rate flowers £5.99 Buy
Cranesbill ‘Geranium x magnificum Rosemoor’ Glorious violet-purple flowers £5.99 Buy