We have found 26 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
Russian Sage ‘Perovskia Blue Spire’ Violet-blue flowers and silvery foliage. Great planted en masse £7.99 Buy
Price Pruned
Butterfly Bush ‘Buddleja Lochinch’ Fragrant violet-blue flowers all summer NOW £5.99 Buy
Bluebeard ‘Caryopteris x clandonensis Heavenly Blue’ Piercing, dark blue flowers £6.49 Buy
Californian Lilac ‘Ceanothus Autumnal Blue’ Sky-blue flowers in late summer £7.99 Buy
Californian Lilac ‘Ceanothus Burkwoodii’ Bright blue flowers in summer £8.99 Buy
Californian Lilac ‘Ceanothus Concha’ Masses of deep blue flowers in spring £6.99 Buy
Californian Lilac ‘Ceanothus Puget Blue’ Fabulous deep blue flowers £6.99 Buy
Californian Lilac ‘Ceanothus thyrsiflorus Skylark’ A haze of bright blue flowers in early summer £8.99 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
Hibiscus (syn. Hibiscus syriacus Blue... ‘Hibiscus syriacus Oiseau Bleu’ Late flowering shrub with... £9.99 Buy
Rough-leaved Hydrangea ‘Hydrangea aspera Villosa Group’ Long-lasting, deep mauve flowers in autumn £10.99 Buy
Lacecap Hydrangea (syn. Blue Wave)... ‘Hydrangea macrophylla Mariesii Perfecta’ Pink or pale blue lacecap flowers £6.99 Buy
Hydrangea ‘Hydrangea serrata Bluebird’ Distinctive blue flowers and autumn colour £8.99 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
Common Lilac ‘Syringa vulgaris Katherine Havemeyer’ Wonderful scented lavender-purple flowers £9.99 Buy