We have found 22 plants that meet your criteria.

African lily
Agapanthus africanus African lily Wonderful globes of blue flowers from midsummer £8.99 Buy
African lily
Agapanthus Back in Black ('B in B') (PBR) African lily Stunning, deep blue flowers... £9.99 Buy
African lily
Agapanthus 'Black Pantha' (PBR) African lily Deep blue, almost black flowers £11.99 Buy
African lily
Agapanthus Headbourne hybrids African lily Showy globes of blue flowers £8.99 Buy
African lily
Agapanthus 'Lavender Haze' African lily A new, large-headed variety £9.99 Buy
cranesbill
Geranium 'Johnson's Blue' cranesbill Elegant blue flowers, good for groundcover £6.99 Buy
Siberian iris
Iris sibirica 'Perry's Blue' Siberian iris Looks great planted in bold clumps £8.49 Buy
Siberian iris
Iris sibirica 'Tropic Night' Siberian iris Velvety, violet flowers with veined yellow throats £7.99 Buy
bearded iris
Iris 'Dusky Challenger' bearded iris Huge ruffled silky rich purple-blue blooms £8.49 Buy
bearded iris
Iris 'Jane Phillips' bearded iris A popular variety with blue flowers £7.99 Buy
bearded iris
Iris 'Mer du Sud' bearded iris Stunning, violet flowers. Very free flowering £9.99 Buy
tall bearded iris
Iris 'White City' tall bearded iris Magnificent in contemporary and cottage settings £7.99 Buy
lavender
Lavandula 'Sawyers' lavender Compact mounds of silvery foliage £7.99 Buy
Siberian iris
Iris sibirica 'Silver Edge' Siberian iris Blue flowers edged with white £7.49 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £7.99 Buy
rosemary
Rosmarinus officinalis Prostratus Group rosemary Forms a mat of fragrant foliage £9.99 Buy
bluebell creeper
Sollya heterophylla bluebell creeper Clusters sky-blue flowers £11.99 Buy
African lily
Agapanthus campanulatus 'Cobalt Blue' African lily Dark blue blooms £9.99 coming soon
African lily
Agapanthus 'Silver Baby' African lily A beautiful dwarf variety £9.99 coming soon
cranesbill
Geranium 'Brookside' cranesbill Deep blue flowers and long flowering seasons £7.99 coming soon