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
Plantain Lily ‘Hosta Patriot’ White-margined leaves £5.99 Buy
African Lily ‘Agapanthus Black Pantha’ Deep blue, almost black flowers £8.99 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
Price Pruned
African Lily ‘Agapanthus Peter Pan’ A compact variety with pale blue flowers NOW £9.99 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
Plantain Lily ‘Hosta Gold Standard’ Spikes of lavender-blue flowers £5.99 Buy
Plaintain Lily ‘Hosta sieboldiana var. elegans’ Heart shaped, pale green leaves and fragrant flowers £5.99 Buy
Plantain Lily ‘Hosta Wide Brim’ Dark green leaves with cream margins £5.99 Buy