Aconitum carmichaelii 'Arendsii' (Monkshood 'Arendsii'): Tall spires of hooded rich blue flowers in late summer. Attractive foliage spring to autumn. To 1.5m. Hardy. [Collect Only]

Ajuga reptans (Bugle): Superb ground cover plant with purplish green leaves and blue flower spikes in summer. Very attractive to bees

Ajuga reptans Black Scallop = 'Binblasca' (PBR) (Bugle 'Black Scallop'): Shiny, darkest purple-red leaves look near black. Short spikes of blue flowers in summer.

Aster 'Little Carlow' (Syn. Symphyotrichum 'Little Carlow' (cordifolium hybrid)): Large sprays of small purplish blue flowers in autumn. Very reliable, easy to grow perennial. Hardy. Up to 1m.

Aster amellus 'King George' (Italian Aster 'King George'): Long-flowering, reliable Aster with violet-blue flowers in the autumn. Compact. Mildew-resistant. Bee-friendly. Hardy. Up to 45cm. [Collect Only]

Aster amellus 'Veilchenkonigin' (Italian Aster 'Veilchenkonigin'): Aster with large violet-blue flowers in the autumn and dark-green foliage. Compact. Bee-friendly. Hardy. Up to 40cm. [Collect Only]

Aster macrophyllus 'Twilight' (Syn. Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. An earlier flowering variety. Height to 1m.

Aster x frikartii 'Monch': Soft lavender blue flowers in late summer.Very early flowering and shorter than many asters at about 80cm. Easy and reliable. Hardy. [Collect Only]

Brunnera macrophylla (Siberian bugloss): Heart shaped green leaves, with sprays of palest blue flowers in spring. Good in shade. [Collect Only]

Brunnera macrophylla 'Alexander's Great' (PBR) (Siberian bugloss 'Alexander's Great'): Statement foliage plant for shade. Large, heart-shaped, silver leaves. Light-blue forget-me-not-like flowers in Spring. Hardy. Up to 40cm. [Collect Only]

Brunnera macrophylla 'Dawson's White' (Siberian bugloss 'Dawson's White'): Heart-shaped green leaves variably edged in creamy white with sprays of blue forget-me-not flowers in spring. Hardy. Up to 15cm.

Brunnera macrophylla 'Emerald Mist' (PBR) (Siberian bugloss 'Emerald Mist'): Large heart shaped leaves with silver banding. Long stems of pale blue forget-me-not flowers. Hardy. Up to 40cm. [Collect Only]

Brunnera macrophylla 'Hadspen Cream' (Siberian bugloss 'Hadspen Cream'): Large, heartshaped green leaves with wide cream margin. Sprays of forget-me-not blue flowers in spring. Hardy. Up to 45cm.

Brunnera macrophylla 'Jack Frost' (PBR) (Siberian bugloss 'Jack Frost'): Large, heartshaped silver leaves with green veins and leaf edges. Sprays of forget-me-not blue flowers in spring.Shade-loving plant. Hardy. Up to 45cm. [Collect Only]

Brunnera macrophylla 'Jennifer' (Siberian bugloss 'Jennifer'): Sprays of bi-coloured blue and white forget-me-not-like flowers above green heart-shaped leaves. A great shade-loving plant. Hardy. Up to 45cm. [Collect Only]

Brunnera macrophylla 'Sea Heart' (PBR) (Siberian bugloss 'Sea Heart'): Large heart-shaped leaves with strong silver colouration with green veins. Sprays of forget-me-not blue flowers. Hardy. Up to 30cm. [Collect Only]

Brunnera macrophylla 'Variegata' (Siberian bugloss 'Variegata'): Large, heartshaped leaves with bold variegation. Sprays of forget-me-not blue flowers in spring. Superb shade plant. Hardy. Up to 45cm.

Calamintha nepeta 'Blue Cloud': Spikes of small, soft blue flowers above mounds of minty scented green leaves. Loved by bees and butterflies. Hardy. Up to 30cm.

Campanula lactiflora 'Prichards Variety' (Milky bellflower 'Prichards Variety'): Clusters of warm blue flowers on tall stems in mid-summer. To 1.5m. Hardy.

Campanula persicifolia (Peach-leaved bellflower): Tall spikes of large, cup-shaped blue flowers over slender foliage in mid-summer. To 1.2m. Hardy

Ceratostigma plumbaginoides (Plumbago, Hardy plumbago, dwarf plumbago): Brilliant blue flowers in later summer over foliage which turns redder as winter approaches.

Geranium 'Alan Mayes' (Cranesbill 'Alan Mayes'): Long flowering geranium with bright blue flowers with purple veining. Clumps of hairy green leaves, turning red in autumn. Hardy. Up to 45cm.

Geranium 'Blue Cloud' (Cranesbill 'Blue Cloud'): Tall cultivar with pale blue flowers & dark purple veining above deeply divided green leaves. Long-flowering. Hardy. Up to 90cm.

Geranium 'Brookside' (Cranesbill 'Brookside'): A reliable, robust variety with large rich blue flowers over a mound of deeply divided leaves. Height to 45cm. Hardy

Geranium 'Nimbus' (Cranesbill 'Nimbus'): Makes medium sized domes of finely divided foliage smothered in purplish blue flowers in early summer. To 50cm. Hardy

Geranium 'Orion' (Cranesbill 'Orion'): A dome of deeply divided foliage, smothered in large blue flowers from early summer onwards

Geranium pratense 'Cloud Nine' (Meadow cranesbill 'Cloud Nine'): An attractive double form of the familiar meadow cranesbill with lovely soft blue flowers. Strong growing. Hardy. Up to 90cm. [Collect Only]

Geranium pratense 'Mrs Kendall Clark' (Meadow cranesbill 'Mrs Kendall Clark'): Palest purpley/grey flowers, makes a good mound of foliage. Hardy. To 40cm.

Geranium Rozanne = 'Gerwat' (PBR) (Geranium 'Rozanne'): Noted for its large blue, white centred flowers and very long flowering period. A fine border geranium. Doesn't run. To 30cm. Hardy [Collect Only]

Hepatica nobilis: Pretty bowl shaped blue flowers in early spring.

Iris sibirica (Siberian Iris): Soft, purplish blue iris flowers over strappy green foliage. [Collect Only]

Iris sibirica 'Perry's Blue' (Siberian Iris 'Perry's Blue'): Lovely pale-blue flowers with white markings over strappy green foliage. Prefers moist soil. Makes a bold clump. Hardy. Up to 85cm.

Lobelia siphilitica (Blue cardinal flower): Tall spikes of clear blue flowers and bright green lance-shaped leaves. Needs a soil which doesn't dry out. Hardy. Up to 90cm.

Phlox divaricata 'Clouds of Perfume': Deliciously scented and delicate pale blue flowers which are long-lasting. Prefers some partial shade. Hardy. Up to 30cm.

Poa labillardierei (Blue tussock grass): Elegant, upright grass with slender blue-green leaves. Arching, open biscuity-coloured panicles in mid-summer. Evergreen.To 1.2m Hardy [Collect Only]

Polemonium 'Blue Pearl' (Jacob's Ladder 'Blue Pearl'): Attractive, low-growing form with fresh green ferny foliage and sky-blue bell-like flowers. Hardy. Up to 30cm.

Polemonium 'Northern Lights' (Jacob's Ladder 'Northern Lights'): Heavenly scented, compact form of Jacob's Ladder, with warm blue flowers

Polemonium caeruleum Brise d'Anjou = 'Blanjou' (Jacob's Ladder 'Brise d'Anjou'): Variegated polemonium with ferny creamy yellow and green foliage. It has delicate cup-shaped lilac blue flowers in early summer. Hardy. Up to 60cm.

Polemonium reptans 'Stairway to Heaven' (PBR) (Jacob's Ladder 'Stairway to Heaven'): Superb variety with attractive variegated foliage and lavender blue flowers. To 50cm. Hardy

Polemonium reptans 'Touch of Class' (PBR) (Jacob's Ladder 'Touch of Class'): Attractive, low-growing form with variegated ferny foliage and pale-blue bell-like flowers. Hardy. Up to 40cm. [Collect Only]

Pulmonaria 'Blue Ensign' (Lungwort 'Blue Ensign'): Rich blue flowers in spring over unspotted dark green foliage. A reliable hardy perennial. Up to 30cm. [Collect Only]

Pulmonaria 'Cotton Cool' (Lungwort 'Cotton Cool'): Slender leaves, so heavily spotted that they're almost completely silver. Classic pulmonaria purple/blue/pink flowers. To 30cm. Hardy.

Pulmonaria 'Trevi Fountain' (Lungwort 'Trevi Fountain'): Long flowering, with blue flowers over silver-speckled leaves in spring. Great in shade. Hardy. Height to 30cm. [Collect Only]

Pulmonaria Opal = 'Ocupol' (Lungwort 'Opal'): Palest ice-blue flowers over dark green leaves splashed with silver. Hardy. to 30cm. [Collect Only]

Salvia guaranitica 'Blue Enigma' (Anise-scented sage 'Blue Enigma'): Tall spikes of deep blue, flowers. Frost-hardy. Up to 1.2m. Prefers full sun and a sheltered spot. Late summer. Attractive to bees.

Salvia uliginosa (Bog Sage): Branched stems of clear blue flowers and lance-shaped leaves. Needs a sunny spot but with moist soil. Hardy. Up to 2m. AGM.

Scabiosa 'Butterfly Blue' (Syn. Scabiosa 'Irish Perpetual Flowering'): Large cornflower blue frilled flowers over lance-shaped grey-green foliage. Semi-evergreen, long flowering season. Up to 60cm. Hardy.

Scabiosa caucasica 'Perfecta Blue' (Scabious 'Perfecta Blue'): Large cornflower blue frilled flowers over lance-shaped grey-green foliage. Height to 60cm. Hardy.

Symphytum azureum: A spreading perennial with green leaves and clusters of pure blue flowers May-July. Grows vigorously in damp shade. Up to 60cm

Tradescantia (Andersoniana Group) 'Leonora' (Spider lily 'Leonora'): Three-petalled vibrant violet-blue flowers above strappy foliage. Great as a ground clump former in sun or part shade

Veronica gentianoides (Gentian Speedwell): Short spikes of pale-blue flowers above rosettes of evergreen glossy leaves. Good for the edge of a border. Hardy. Up to 45cm.

Veronica longifolia (Long-leaved speedwell): Tall spires of blue flowers above long, slender foliage. To 1.5m. Hardy. [Collect Only]