We have found 165 plants that meet your criteria.

alkanet
Anchusa azurea 'Loddon Royalist' alkanet Intense blue flowers in early summer £7.99 Buy
Alpine columbine
Aquilegia alpina Alpine columbine Jaunty, nodding blue flowers in spring £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
New
Aquilegia Blue Barlow
Aquilegia vulgaris var. stellata 'Blue Barlow' (Barlow Series) Aquilegia Blue Barlow £4.99 Buy
michalmas daisy
Aster × frikartii 'Mönch' michalmas daisy Lavender-blue, daisy flowers £7.99 Buy
aster
Aster 'Little Carlow' (cordifolius hybrid) aster Pretty violet-blue daisies in late summer £7.99 Buy
false indigo
Baptisia australis false indigo Decorative seed-pods in winter £7.99 Buy
false Indigo
Baptisia australis false Indigo Decorative seed-pods in winter £4.99 Buy
Siberian bugloss (syn. 'Variegata')
Brunnera macrophylla 'Dawson's White' Siberian bugloss (syn. 'Variegata') An excellent groundcover £9.99 Buy
Siberian bugloss
Brunnera macrophylla 'Jack Frost' (PBR) Siberian bugloss large, silvery leaves and frothy blue flowers £9.99 Buy
lesser catmint
Calamintha nepeta subsp. nepeta 'Blue Cloud' lesser catmint Aromatic leaves and blue flowers £6.99 Buy
bellflower
Campanula carpatica 'Blaue Clips' bellflower Profusion of blue, bell-like flowers £6.99 Buy
milky bellflower
Campanula lactiflora 'Pritchard's Variety' milky bellflower Masses of bell-like lilac flowers £6.99 Buy
New
Campanula sarmatica 'Hemelstraling' bellflower Elegant, upright flowerspikes £5.99 Buy
herbaceous clematis (Group 3)
Clematis heracleifolia herbaceous clematis (Group 3) Ideal for spilling over a wall £12.99 Buy
herbaceous clematis (group 3)
Clematis Blue River ('Zoblueriver') (PBR) herbaceous clematis (group 3) Much admired at Cheslea... £12.99 Buy
delphinium
Delphinium 'Blue Jay' delphinium Showy, semi-double blue flowers with dark eyes £7.99 Buy
New
delphinium
Delphinium 'Centurian Gentian Blue' (Centurion Series) delphinium Amazing flower colour £4.99 Buy
globe thistle
Echinops bannaticus 'Blue Globe' globe thistle Large globes of dark blue flowers £7.99 Buy
globe thistle
Echinops bannaticus 'Taplow Blue' globe thistle Spherical, bright blue flower-heads £7.99 Buy