We have found 20 plants that meet your criteria.

Agapanthus africanus African Lily Globes of blue flowers in late summer £6.84 Buy
Price Pruned
Ajuga reptans 'Atropurpurea' Bugle Good groundcover for shade NOW £4.88 Buy
Price Pruned
Ajuga reptans 'Burgundy Glow' Bugle Multi-coloured evergreen foliage NOW £4.88 Buy
Price Pruned
Ajuga reptans 'Catlin's Giant' Bugle Handsome evergreen ground cover NOW £4.88 Buy
Nepeta x faassenii Catmint Loose drifts of lavender flowers. Great for edging £5.86 Buy
Nepeta subsessilis 'Cool Cat' Catmint Lavender-blue flowers. Great for a herb garden £5.86 Buy
Nepeta x faassenii 'Kit Cat' Catmint A dwarf variety with purple flowers £5.86 Buy
Price Pruned
Nepeta 'Six Hills Giant' Catmint A hardy catmint with lavender flowers NOW £4.88 Buy
Nepeta subsessilis 'Washfield' Catmint Pretty catmint with bright blue flowers £5.86 Buy
Nepeta racemosa 'Walker's Low' Catnip Long flowering period £5.86 Buy
Nepeta grandiflora 'Wild Cat' Giant Catmint A giant catmint with deep purple-blue flowers £5.86 Buy
Price Pruned
Iris pallida 'Argenteovariegata' Great Purple Flag Stunning grey-green and white variegated leaves NOW £5.86 Buy
Price Pruned
Vinca major Greater Periwinkle Elegant blue-violet flowers NOW £4.88 Buy
Vinca major 'Variegata' Greater Periwinkle Large, bright blue flowers £5.86 Buy
Vinca minor Lesser Periwinkle Superb ground cover £5.86 Buy
Vinca minor 'Argenteovariegata' Lesser Periwinkle Creamy-white leaves £5.86 Buy
Price Pruned
Vinca minor 'Illumination' Periwinkle Brand new introduction NOW £5.86 Buy
Price Pruned
Phlox divaricata 'Blue Perfume' Phlox Masses of lilac-blue fragrant blooms NOW £5.37 Buy
Iris sibirica 'Perry's Blue' Siberian Flag Looks great planted in bold clumps £5.86 Buy
Price Pruned
Viola odorata Sweet Violet Sweetly fragrant flowers NOW £4.88 Buy