We have found 24 plants that meet your criteria.

African lily
Agapanthus africanus African lily Wonderful globes of blue flowers from midsummer £8.99 Buy
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African lily
Agapanthus africanus African lily Globes of blue flowers in late summer £19.99 Buy
African lily
Agapanthus 'Black Pantha' (PBR) African lily Deep blue, almost black flowers £12.99 Buy
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African lily
Agapanthus 'Lavender Haze' African lily A new, large-headed variety NOW £6.99 Buy
New
African lily
Agapanthus 'Phantom' African lily A luscious evergreen form £8.99 Buy
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African lily
Agapanthus 'Silver Baby' African lily A beautiful dwarf variety NOW £9.99 Buy
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cranesbill
Geranium 'Brookside' cranesbill Deep blue flowers and long flowering seasons NOW £5.99 Buy
cranesbill
Geranium 'Johnson's Blue' cranesbill Elegant blue flowers, good for groundcover £7.99 Buy
Siberian iris
Iris sibirica 'Caesar's Brother' Siberian iris Intense violet flowers. Great in reliably moist soil £7.99 Buy
Siberian iris
Iris sibirica 'Silver Edge' Siberian iris Blue flowers edged with white £7.99 Buy
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Siberian iris
Iris sibirica 'Tropic Night' Siberian iris Velvety, violet flowers with veined yellow throats NOW £6.99 Buy
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bearded iris
Iris 'Jane Phillips' bearded iris A popular variety with blue flowers NOW £6.99 Buy
bearded iris
Iris 'Mer du Sud' bearded iris Stunning, violet flowers. Very free flowering £9.99 Buy
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bearded iris
Iris 'White City' bearded iris Magnificent in contemporary and cottage settings NOW £6.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 Buy
lavender
Lavandula 'Sawyers' lavender Compact mounds of silvery foliage £8.99 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £8.99 Buy
rosemary
Rosmarinus officinalis Prostratus Group rosemary Forms a mat of fragrant foliage £9.99 Buy
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bluebell creeper
Sollya heterophylla bluebell creeper Clusters sky-blue flowers NOW £9.99 Buy
African lily
Agapanthus Headbourne hybrids African lily Showy globes of blue flowers £8.99 Buy