We have found 47 plants that meet your criteria.

Aconitum 'Stainless Steel' Monkshood Striking metallic-blue hooded flowers £7.82 Buy
Agapanthus africanus African Lily Globes of blue flowers in late summer £6.84 Buy
Agapanthus 'Headbourne hybrids' African Lily Showy globes of blue and white flowers £6.84 Buy
Price Pruned
Agastache 'Blue Fortune' Mexican Giant Hyssop Spires of lilac flowers and aromatic leaves NOW £5.37 Buy
Aquilegia vulgaris var. 'stellata Blue Barlow' Granny's Bonnet Stunning violet-blue double flowers £5.37 Buy
Aster x frikartii 'Mönch' Michaelmas Daisy Lavender-blue, daisy flowers £5.86 Buy
Aster 'Little Carlow (cordifolius hybrid)' Aster Pretty violet-blue daisies in late summer £5.86 Buy
Price Pruned
Calamintha nepeta subsp. 'nepeta Blue Cloud' Lesser Catmint Aromatic leaves and blue flowers NOW £4.88 Buy
Camassia leichtlinii Camassia Spires of blue or lilac star-shaped flowers £6.36 Buy
Campanula lactiflora 'Pritchard's Variety' Milky Bellflower Masses of bell-like lilac flowers £5.86 Buy
Price Pruned
Ceratostigma willmottianum Hardy Plumbago Excellent red autumn foliage NOW £4.88 Buy
Price Pruned
Iris pallida 'Argenteovariegata' Great Purple Flag Stunning grey-green and white variegated leaves NOW £5.86 Buy
Iris sibirica 'Caesar's Brother' Siberian Iris Intense violet flowers. Great in boggy ground £5.86 Buy
Iris sibirica 'Silver Edge' Siberian Flag Blue flowers edged with white £5.86 Buy
Iris sibirica 'Tropic Night' Siberian Flag Violet flowers with yellow throats. Good for boggy ground £5.86 Buy
Nepeta subsessilis 'Cool Cat' Catmint Lavender-blue flowers. Great for a herb garden £5.86 Buy
Nepeta subsessilis 'Washfield' Catmint Pretty catmint with bright blue flowers £5.86 Buy
Nepeta x faassenii Catmint Loose drifts of lavender flowers. Great for edging £5.86 Buy
Nepeta x faassenii 'Kit Cat' Catmint A dwarf variety with purple flowers £5.86 Buy
Price Pruned
Nepeta 'Six Hills Giant' Catmint A hardy catmint with lavender flowers NOW £4.88 Buy