We have found 22 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
Aster ‘Aster Little Carlow (cordifolius hybrid)’ Pretty violet-blue daisies in late summer £5.99 Buy
Michaelmas Daisy ‘Aster x frikartii Monch’ Lavender-blue, daisy flowers £5.99 Buy
Crocus Special Offers
Hardy Plumbago ‘Ceratostigma willmottianum’ Excellent red autumn foliage NOW £4.99 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
Catnip ‘Nepeta racemosa Walker's Low’ Long flowering period £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
Catmint ‘Nepeta x faassenii’ Loose drifts of lavender flowers. Great for edging £5.99 Buy
Catmint ‘Nepeta x faassenii Kit Cat’ A dwarf variety with purple flowers £5.99 Buy
Price Pruned
Perennial Phlox ‘Phlox paniculata Blue Paradise’ Fragrant violet flowers all summer NOW £5.49 Buy
Sage ‘Salvia patens’ Large, stunning blue blooms £5.99 Buy
African Lily ‘Agapanthus Headbourne Hybrids’ Showy globes of blue and white flowers £5.99 Buy
Price Pruned
Amsonia ‘Amsonia tabernaemontana’ Dense clusters of ice-blue, star-like flowers NOW £5.99 Buy
Price Pruned
Columbine ‘Aquilegia McKana Hybrids’ Bonnet-like flowers in a range of colours NOW £4.99 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