We have found 30 plants that meet your criteria.

African lily
Agapanthus 'Northern Star' (PBR) African lily One of the hardier agapanthus £9.99 Buy
African lily
Agapanthus campanulatus 'Cobalt Blue' African lily Dark blue blooms £9.99 coming soon
African lily
Agapanthus Back in Black ('B in B') (PBR) African lily Stunning, deep blue flowers... £9.99 coming soon
African lily
Agapanthus 'Castle of Mey' African lily A tall, rich blue form £9.99 coming soon
African lily
Agapanthus 'Taw Valley' African lily Deep blue flowerheads £9.99 coming soon
African lily
Agapanthus 'Taw Valley' African lily A spectacular summer-flowering perennial £6.99 coming soon
New
congested snake lily
Dichelostemma congestum congested snake lily An exotic-looking sun-lover £3.99 coming soon
miss willmott's ghost
Eryngium giganteum miss willmott's ghost Large, steely-grey flowers £8.49 coming soon
giant sea holly
Eryngium giganteum 'Silver Ghost' giant sea holly Stunning silvery white bracts £9.99 coming soon
button eryngo
Eryngium yuccifolium button eryngo Distinctive strap-shaped foliage £7.99 coming soon