We have found 17 plants that meet your criteria.

Perovskia abrotanoides Russian Sage Silvery white aromatic foliage with long lasting blue flowers £7.99 Buy
Perovskia 'Blue Spire' Russian Sage Violet-blue flowers and silvery foliage. Great planted en masse £7.99 Buy
Price Pruned
Rosa Rhapsody in Blue '('Frantasia') (PBR)' rose (shrub) The closest to a blue rose NOW £10.99 Buy
Vinca minor 'La Grave' Lesser Periwinkle syn. V. minor... Gorgeous lavender-blue blooms £5.99 Buy
Price Pruned
Buddleja 'Lochinch' Butterfly Bush Fragrant violet-blue flowers all summer NOW £5.99 Buy
Caryopteris x clandonensis 'Heavenly Blue' Bluebeard Piercing, dark blue flowers £6.49 Buy
Ceratostigma willmottianum 'Desert Skies' Hardy Plumbago A stunning new variety of hardy plumbago £7.49 Buy
Ceratostigma willmottianum 'Forest Blue' Hardy Plumbago Foliage turns wonderful autumnal colours £6.99 Buy
Hydrangea aspera 'Villosa Group' Rough-leaved Hydrangea Long-lasting, deep mauve flowers in autumn £10.99 Buy
Hydrangea macrophylla 'Mariesii Perfecta' Lacecap Hydrangea (syn. Blue Wave)... Pink or pale blue lacecap flowers £6.99 Buy
Hydrangea serrata 'Bluebird' Hydrangea Distinctive blue flowers and autumn colour £8.99 Buy
Price Pruned
Perovskia atriplicifolia 'Little Spire' Russian Sage A shorter form of the popular Russian sage NOW £7.99 Buy
Price Pruned
Vinca major Greater Periwinkle Elegant blue-violet flowers NOW £4.99 Buy
Vinca major 'Variegata' Greater Periwinkle Large, bright blue flowers £5.99 Buy
Vinca minor Lesser Periwinkle Superb ground cover £5.99 Buy
Vinca minor 'Argenteovariegata' Lesser Periwinkle Creamy-white leaves £5.99 Buy
Price Pruned
Vinca minor 'Illumination' Periwinkle Brand new introduction NOW £5.99 Buy