We have found 13 plants that meet your criteria.

Alkanet ‘Anchusa azurea Loddon Royalist’ Intense blue flowers in early summer £5.49 Buy
Delphinium ‘Delphinium Gillian Dallas’ Stunning mauve-blue flowers with a white eye £7.99 Buy
Price Pruned
Delphinium ‘Delphinium Langdon's Orpheus’ Pretty, iridiscent blue-mauve flowers NOW £7.99 Buy
Bog Sage ‘Salvia uliginosa’ Intense blue flowers £5.99 Buy
Price Pruned
Culver's Root ‘Veronicastrum virginicum Fascination’ Elegant spires of bluey-mauve blooms NOW £5.49 Buy
Monkshood ‘Aconitum Stainless Steel’ Striking metallic-blue hooded flowers £7.99 Buy
African Lily ‘Agapanthus Lavender Haze’ A new, large-headed variety £6.99 Buy
Crocus Special Offers
Delphinium ‘Delphinium Blue Jay’ Showy, semi-double blue flowers with dark eyes NOW £5.49 Buy
Tower of Jewels ‘Echium pininana’ Enormous spikes of blue flowers £6.99 Buy
Bearded Iris ‘Iris Dusky Challenger’ Huge ruffled silky rich purple-blue blooms £6.99 Buy
Monkshood ‘Aconitum napellus’ Gorgeous deep blue flowers glow in the shade £5.99 coming soon
Price Pruned
African Lily ‘Agapanthus inapertus subsp. intermedius’ Tall flowerspikes with pendulous flower clusters NOW £19.99 coming soon
Pride of Madeira ‘Echium candicans’ Dramatic purple spikes in early summer. Drought tolerant £5.99 coming soon