We have found 12 plants that meet your criteria.

African Lily ‘Agapanthus africanus’ Globes of blue flowers in late summer £5.99 Buy
Sea Holly ‘Eryngium x zabelii Jos Eijking’ Spiny metallic-blue flowers in late summer £7.99 Buy
African Lily ‘Agapanthus Headbourne Hybrids’ Showy globes of blue and white flowers £5.99 Buy
African Lily ‘Agapanthus Lavender Haze’ A new, large-headed variety £6.99 Buy
Sea Holly ‘Eryngium bourgatii Picos Amethyst’ New variety with deep blue flowers £7.99 Buy
Sea Holly (Eryngium planum Blue... ‘Eryngium planum Blauer Zwerg’ Dwarf variety with deep blue flowers £5.49 Buy
African Lily ‘Agapanthus Glen Avon’ Magnificent new variety £6.99 coming soon
Pride of Madeira ‘Echium candicans’ Dramatic purple spikes in early summer. Drought tolerant £5.99 coming soon
Tower of Jewels ‘Echium pininana’ Enormous spikes of blue flowers £6.99 coming soon
Miss Willmott's Ghost ‘Eryngium giganteum’ Large, steely-grey flowers £6.99 coming soon
Sea Holly ‘Eryngium planum Blaukappe’ Tall, with intensely blue flowers £5.49 coming soon
Giant Sea Holly ‘Eryngium giganteum Silver Ghost’ Stunning silvery white bracts £6.99 coming soon