We have found 15 plants that meet your criteria.

Hardy Plumbago ‘Ceratostigma willmottianum Forest Blue’ Foliage turns wonderful autumnal colours £6.99 Buy
Price Pruned
Lavender ‘Lavandula angustifolia Munstead’ A compact variety with blue-purple flowers NOW £4.99 Buy
Bluebeard ‘Caryopteris x clandonensis Heavenly Blue’ Piercing, dark blue flowers £6.49 Buy
Creeping Blueblossom ‘Ceanothus thyrsiflorus var. repens’ A low-growing evergreen with blue flowers £8.99 Buy
Hardy Plumbago ‘Ceratostigma willmottianum Desert Skies’ A stunning new variety of hardy plumbago £7.49 Buy
Lacecap Hydrangea (syn. Blue Wave)... ‘Hydrangea macrophylla Mariesii Perfecta’ Pink or pale blue lacecap flowers £6.99 Buy
Russian Sage ‘Perovskia abrotanoides’ Silvery white aromatic foliage with long lasting blue flowers £7.99 Buy
Price Pruned
Russian Sage ‘Perovskia atriplicifolia Little Spire’ A shorter form of the popular Russian sage NOW £7.99 Buy
Rosemary ‘Rosmarinus officinalis Miss Jessopp's Upright’ Lavender-blue flowers £5.99 Buy
Price Pruned
Greater Periwinkle ‘Vinca major’ Elegant blue-violet flowers NOW £4.99 Buy
Greater Periwinkle ‘Vinca major Variegata’ Large, bright blue flowers £5.99 Buy
Lesser Periwinkle ‘Vinca minor’ Superb ground cover £5.99 Buy
Lesser Periwinkle ‘Vinca minor Argenteovariegata’ Creamy-white leaves £5.99 Buy
Price Pruned
Periwinkle ‘Vinca minor Illumination’ Brand new introduction NOW £5.99 Buy
Lesser Periwinkle syn. V. minor... ‘Vinca minor La Grave’ Gorgeous lavender-blue blooms £5.99 Buy