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Amsonia tabernaemontana (Blue dogbane)
Amsonia tabernaemontana (Blue dogbane): Starry blue flowers on strong stems with willowy green leaves. Hardy. Up to 90cm.
Calamintha nepeta 'Blue Cloud'
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')
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)
Campanula persicifolia (Peach-leaved bellflower): Tall spikes of large, cup-shaped blue flowers over slender foliage in mid-summer. To 1.2m. Hardy
Catananche caerulea 'Major' (Cupid's dart 'Major')
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.
Corydalis elata
Corydalis elata: Summer flowering Corydalis with bright blue flowers above soft green foliage. Excellent in some shade in moist soil. Hardy. Up to 30cm.
Cynoglossum nervosum (Himalayan hound's tongue)
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. [Collect Only]
Echinops ritro (Globe Thistle)
Echinops ritro (Globe Thistle): Blue globes held above stout grey green foliage. Attractive to bees. Likes well drained soil and plenty of sun. Hardy. Up to 1m. [Collect Only]
Echinops ritro 'Veitch's Blue' (Globe thistle)
Echinops ritro 'Veitch's Blue' (Globe thistle): Dark blue spherical flower heads above attractive grey-green foliage. Loved by bees and butterflies. Hardy. Up to 1m [Collect Only]
Eryngium bourgatii Graham Stuart Thomas's selection (Sea Holly Graham Stuart Thomas's selection)
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 'Blue Cloud' (Cranesbill 'Blue Cloud')
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 'Nimbus' (Cranesbill 'Nimbus')
Geranium 'Nimbus' (Cranesbill 'Nimbus'): Makes medium sized domes of finely divided foliage smothered in purplish blue flowers in early summer. To 50cm. Hardy
Geranium pratense 'Cloud Nine' (Meadow cranesbill 'Cloud Nine')
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')
Geranium pratense 'Mrs Kendall Clark' (Meadow cranesbill 'Mrs Kendall Clark'): Palest purpley/grey flowers, makes a good mound of foliage. Hardy. To 40cm.
Iris sibirica (Siberian Iris)
Iris sibirica (Siberian Iris): Soft, purplish blue iris flowers over strappy green foliage. [Collect Only]
Nepeta 'Neptune' (PBR) (Catmint 'Neptune')
Nepeta 'Neptune' (PBR) (Catmint 'Neptune'): A compact Catmint with large deep-blue flowers and aromatic grey-green foliage. Good in a border or in a container. Hardy. Up to 40cm
Scabiosa caucasica 'Clive Greaves' (Scabious 'Clive Greaves')
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.
Scabiosa caucasica 'Stafa' (Scabious 'Stafa')
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')
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')
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) 'Leonora' (Spider lily 'Leonora')
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 longifolia (Long-leaved speedwell)
Veronica longifolia (Long-leaved speedwell): Tall spires of blue flowers above long, slender foliage. To 1.5m. Hardy. [Collect Only]

Found 22 matches:

Colour: Blue [ X ]
Flowering: Mid Summer [ X ]
Type: Hardy perennial [ X ]

Height when grown

0 to 30cm (2)
30cm to 60cm (11)
60cm to 90cm (4)
90cm to 1.2m (2)
Over 1.2m (3)

Aspect

Part-shade (12)
Shade (2)
Sun (21)

Soil

Drained (21)
Dry (4)
Moist (12)
Normal (20)
Wet (1)

Spread Rate

Fast (3)
Moderate (18)
Slow (1)