We have found 76 plants that meet your criteria.

bugle
Ajuga reptans 'Catlin's Giant' bugle Handsome evergreen ground cover £6.99 Buy
granny's bonnet
Aquilegia caerulea granny's bonnet A cottage garden favourite £7.49 Buy
granny's bonnet
Aquilegia vulgaris var.stellata 'Blue Barlow' (Barlow Series) granny's bonnet Stunning violet-blue double flowers £7.49 Buy
butterfly bush
Buddleja 'Lochinch' butterfly bush Fragrant violet-blue flowers all summer £8.99 Buy
bluebeard
Caryopteris × clandonensis 'Heavenly Blue' bluebeard Piercing, dark blue flowers £7.49 Buy
Price Pruned
heron's bill
Erodium manescavii heron's bill Super saucer-shaped rich pink flowers NOW £5.99 Buy
cranesbill
Geranium himalayense 'Gravetye' cranesbill Large, purple-blue flowers with reddish centres £6.99 Buy
cranesbill
Geranium wallichianum 'Buxton's Variety' cranesbill Late flowering, with soft, blue-mauve flowers £8.99 Buy
cranesbill
Geranium 'Johnson's Blue' cranesbill Elegant blue flowers, good for groundcover £6.99 Buy
cranesbill
Geranium 'Nimbus' cranesbill A prolific-flowering groundcover £7.99 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
beardless iris
Iris setosa beardless iris A handsome rhizomatous, bearless iris £7.99 Buy
Siberian iris
Iris sibirica 'Perry's Blue' Siberian iris Looks great planted in bold clumps £8.49 Buy
Siberian iris
Iris sibirica 'Tropic Night' Siberian iris Velvety, violet flowers with veined yellow throats £7.99 Buy
bearded iris
Iris 'Jane Phillips' bearded iris A popular variety with blue flowers £7.99 Buy
Russian sage
Perovskia 'Blue Spire' Russian sage Violet-blue flowers and silvery foliage. Great planted en masse £9.99 Buy
fiddleneck
Phacelia tanacetifolia fiddleneck Fast growing, and wildlife friendly £1.79 Buy
rosemary
Rosmarinus officinalis 'Miss Jessopp's Upright' rosemary Lavender-blue flowers £7.99 Buy