Amsonia hubrichtii (Hubricht's bluestar): Clumps of soft feathery green foliage and palest blue star-like flowers in late Spring. Textural plant. Attractive autumn colour. Up to 60cm. Hardy

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]

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 '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. [Collect Only]

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.

Brunnera macrophylla 'Looking Glass' (PBR) (Siberian bugloss 'Looking Glass'): Almost entirely silver leaves, faint green veins. Sprays of forget-me-not blue flowers in spring. Excellent in shade. Hardy. Up to 45cm.

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.

Catananche caerulea 'Major' (Cupid's dart 'Major'): Masses of papery blue flowers held on wiry stems all summer. Seed heads turn silver in late summer. [Collect Only]

Centaurea montana (Perennial cornflower): Large blue flowers in early summer, repeated later in year if cut back. Very attractive to bees. To 50cm. Hardy [Collect Only]

Cynoglossum nervosum (Himalayan hound's tongue): Upright stems of clear blue flowers, like Forget-me-not, bright green hairy, lance-shaped leaves. Needs sun and well-drained soil. Hardy. Up to 60cm.

Eryngium bourgatii Graham Stuart Thomas's selection (Sea Holly Graham Stuart Thomas's selection): Spiny, violet blue flowers in summer of even spinier blue-green leaves with white mid-ribs.

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

Limonium platyphyllum (Broad leaved Statice): A froth of tiny lavender blue flowers on stiff stems in mid-summer. Likes a dry sunny spot. To 60cm.

Nepeta 'Six Hills Giant' (Catmint 'Six Hills Giant'): A vigorous sun lover which will soon make a generous clump. Spikes of tiny purple flowers over aromatic grey/green foliage.

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 [Collect Only]

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.

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 'Clive Greaves' (Scabious 'Clive Greaves'): A very good reliable old variety of scabious with large blue frilled flowers over lance-shaped grey-green foliage. Height to 60cm. Hardy. [Collect Only]

Scabiosa caucasica 'Stafa' (Scabious 'Stafa'): A darker blue form of the classic large cornflower blue frilled scabious flowers over lance-shaped grey-green foliage. Height to 60cm. Hardy.

Stokesia laevis 'Blue Star' (Stoke's aster 'Blue Star'): Large fluffy blue flowers in mid-summer, slender green leaves. To 40cm. Hardy

Stokesia laevis 'Purple Parasols' (Stoke's aster 'Purple Parasols'): Large, fluffy purple flowers over slender grey-green foliage. A lovely plant for sunny, well-drained borders. To 40cm. Hardy.

Tradescantia (Andersoniana Group) 'Euridice' (Spider lily 'Euridice'): Three-petalled delicate pale blue flowers above strappy foliage. Great as a ground clump former in sun or part shade. [Collect Only]

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.