We have found 34 plants that meet your criteria.

bluebeard
Caryopteris × clandonensis 'Heavenly Blue' bluebeard Piercing, dark blue flowers £8.99 Buy
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creeping blueblossom
Ceanothus thyrsiflorus var. repens creeping blueblossom A low-growing evergreen with blue flowers NOW £9.99 Buy
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Californian lilac
Ceanothus thyrsiflorus 'Skylark' Californian lilac A haze of bright blue flowers in early summer NOW £8.99 Buy
Californian lilac
Ceanothus 'Autumnal Blue' Californian lilac Sky-blue flowers in late summer £12.99 Buy
Californian lilac
Ceanothus 'Burkwoodii' Californian lilac Bright blue flowers in summer £12.99 Buy
Californian lilac
Ceanothus 'Concha' Californian lilac Masses of deep blue flowers in spring £12.99 Buy
Chinese plumbago
Ceratostigma willmottianum Forest Blue ('Lice') (PBR) Chinese plumbago Foliage turns wonderful autumnal... £9.99 Buy
rough-leaved hydrangea
Hydrangea aspera 'Villosa Group' rough-leaved hydrangea Long-lasting, deep mauve flowers in autumn £14.99 Buy
hydrangea
Hydrangea macrophylla Endless Summer Blue ('Bailmer') hydrangea A profusion of blue mophead flowers £22.99 Buy
lacecap hydrangea (syn. Blue Wave)
Hydrangea macrophylla 'Mariesii Perfecta' lacecap hydrangea (syn. Blue Wave)... Blue or pink lacecap flowers £9.99 Buy
hydrangea
Hydrangea serrata 'Bluebird' hydrangea Distinctive blue (or sometimes pink) flowers and autumn colour £9.99 Buy
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hydrangea
Hydrangea Expression ('Youmesix') hydrangea A longer-blooming, double form NOW £9.99 Buy
lavender
Lavandula angustifolia 'Munstead' lavender A compact variety with blue-purple flowers £7.99 Buy
lavender
Lavandula 'Sawyers' lavender Compact mounds of silvery foliage £8.99 Buy
Russian sage
Perovskia atriplicifolia 'Little Spire' (PBR) Russian sage A shorter form of the popular Russian sage £9.99 Buy
Russian sage
Perovskia 'Blue Spire' Russian sage Violet-blue flowers and silvery foliage. Great planted en masse £9.99 Buy
Price Pruned
rose Rhapsody in Blue (shrub)
Rosa Rhapsody in Blue ('Frantasia') (PBR) rose Rhapsody in Blue (shrub)... The closest to a... NOW £13.49 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £8.99 Buy
rosemary
Rosmarinus officinalis Prostratus Group rosemary Forms a mat of fragrant foliage £9.99 Buy
Price Pruned
common Lilac
Syringa vulgaris 'Katherine Havemeyer' common Lilac Wonderful scented lavender-purple flowers NOW £16.99 Buy