We have found 88 plants that meet your criteria.

Mexican giant hyssop
Agastache 'Blue Fortune' Mexican giant hyssop Spires of lilac flowers and aromatic leaves £6.99 Buy
michalmas daisy
Aster × frikartii 'Mönch' michalmas daisy Lavender-blue, daisy flowers £7.99 Buy
lesser catmint
Calamintha nepeta subsp. nepeta 'Blue Cloud' lesser catmint Aromatic leaves and blue flowers £6.99 Buy
milky bellflower
Campanula lactiflora 'Pritchard's Variety' milky bellflower Masses of bell-like lilac flowers £6.99 Buy
bluebeard
Caryopteris × clandonensis 'Heavenly Blue' bluebeard Piercing, dark blue flowers £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
Chinese plumbago
Ceratostigma willmottianum Forest Blue ('Lice') (PBR) Chinese plumbago Foliage turns wonderful autumnal... £9.99 Buy
clematis (group 2)
Clematis Franziska Maria ('Evipo008') clematis (group 2) exceptionally free flowering £12.99 Buy
clematis (group 3)
Clematis Happy Birthday ('Zohapbi') (PBR) clematis (group 3) Dark flowers become paler as they age £14.99 Buy
clematis (group 3)
Clematis 'Perle d'Azur' clematis (group 3) Stunning pale turquoise-blue flowers £12.99 Buy
New
viper's bugloss
Echium vulgare viper's bugloss Magnificent flowerspikes £2.49 Buy
viper's bugloss
Echium vulgare 'Blue Bedder' viper's bugloss Loved by bees and other pollinating insects £2.49 Buy
sea holly
Eryngium × zabelii 'Jos Eijking' (PBR) sea holly Spiny metallic-blue flowers in late summer £8.49 Buy
New
geranium
Geranium wallichianum 'Havana Blues' geranium Good contrast between flowers and foliage £6.99 Buy
New
cranesbill
Geranium 'Brookside' cranesbill Deep blue flowers and long flowering seasons £4.99 Buy
Crocus Special Offers
cranesbill
Geranium 'Brookside' cranesbill Deep blue flowers and long flowering seasons NOW £5.99 Buy
tree hollyhock (syn. Blue Bird)
Hibiscus syriacus 'Oiseau Bleu' tree hollyhock (syn. Blue Bird)... Late flowering shrub with large blue flowers £12.99 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