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Aconitum napellus (Monkshood)
Aconitum napellus (Monkshood): Dark blue hooded flowers over finely divided foliage. This Aconitum flowers early, in late spring/early summer. Height to 1.5m. Hardy. [Collect Only]
Ajuga reptans (Bugle)
Ajuga reptans (Bugle): Superb ground cover plant with purplish green leaves and blue flower spikes in summer. Very attractive to bees
Ajuga reptans 'Catlin's Giant' (Bugle 'Caitlin's Giant')
Ajuga reptans 'Catlin's Giant' (Bugle 'Caitlin's Giant'): Superb ground cover plant with bronze-purple leaves and blue flower spikes in summer. Semi-evergreen. Very attractive to bees.
Amsonia tabernaemontana (Blue dogbane)
Amsonia tabernaemontana (Blue dogbane): Starry blue flowers on strong stems with willowy green leaves. Hardy. Up to 90cm. [Collect Only]
Aster 'Little Carlow' (Syn. Symphyotrichum 'Little Carlow' (cordifolium hybrid))
Aster 'Little Carlow' (Syn. Symphyotrichum 'Little Carlow' (cordifolium hybrid)): Large sprays of small purplish blue flowers in autumn. Very reliable, easy to grow perennial. Up to 1m.
Baptisia australis (Indigo weed)
Baptisia australis (Indigo weed): Spires of lipped indigo flowers over olive-green foliage. Flowering height 1.2m. [Collect Only]
Brunnera macrophylla (Siberian bugloss)
Brunnera macrophylla (Siberian bugloss): Heart shaped green leaves, with sprays of palest blue flowers in spring. Good in shade. Up to 30cm. [Collect Only]
Brunnera macrophylla 'Alchemy Silver' (Siberian bugloss)
Brunnera macrophylla 'Alchemy Silver' (Siberian bugloss): Large silver heart shaped leaves with dark green veining. Bright blue forget-me-not like flowers in spring. Great for shady areas. Hardy. Up to 40cm.
Brunnera macrophylla 'Alexander's Great' (PBR) (Siberian bugloss 'Alexander's Great')
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.
Brunnera macrophylla 'Hadspen Cream' (Siberian bugloss 'Hadspen Cream')
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')
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.
Brunnera macrophylla 'Jennifer' (Siberian bugloss 'Jennifer')
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 'Variegata' (Siberian bugloss 'Variegata')
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.
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 1m. Hardy.
Centaurea montana (Perennial cornflower)
Centaurea montana (Perennial cornflower): Large blue flowers in early summer, repeated later in year if cut back. Very attractive to bees. To 50cm. Hardy
Centaurea montana 'Grandiflora' (Perennial cornflower 'Grandiflora')
Centaurea montana 'Grandiflora' (Perennial cornflower 'Grandiflora'): Larger blue flowers than the species, with darker purple heart in early summer, cut back for repeat flowering. Very attractive to bees. To 50cm. Hardy
Ceratostigma plumbaginoides (Plumbago, Hardy plumbago, dwarf plumbago)
Ceratostigma plumbaginoides (Plumbago, Hardy plumbago, dwarf plumbago): Brilliant blue flowers in later summer over foliage which turns redder as winter approaches. Stunning ground cover plant for sheltered spots. Not fully hardy in colder parts of UK. To 20cm. Frost-hardy
Cichorium intybus (Wild chicory)
Cichorium intybus (Wild chicory): Beautiful cornflower-blue flowers held on tall stems in late summer. The flowers appear dotted all along the stems in succession through late summer and early autumn. To 2m [Collect Only]
Echinops bannaticus 'Blue Globe' (Globe thistle)
Echinops bannaticus 'Blue Globe' (Globe thistle): Tall upright stems of bright blue globe flowers above clumps of spiny, grey-green leaves. Bee-friendly. Hardy. Up to 1.2m.
Echinops bannaticus 'Taplow Blue' (Globe thistle)
Echinops bannaticus 'Taplow Blue' (Globe thistle): Tall stems of pale blue globe flowers, clumps of spiny, grey-green leaves with silver undersides. Bee-friendly. Hardy. Up to 1.5m.
Eryngium alpinum 'Blue Star'
Eryngium alpinum 'Blue Star': Large electric-blue flowers with a spiky collar and spiky silver-green foliage. Slightly shorter then some other Eryngium varieties. Hardy. Up to 70cm. [Collect Only]
Eryngium bourgatii 'Picos Amethyst''
Eryngium bourgatii 'Picos Amethyst'': Stunning steely blue flowers on stiff stems with a gorgeous purple tint. Loves sunshine and well-drained soil. To 70cm. [Collect Only]
Eryngium x zabelii 'Big Blue (Sea Holly 'Big Blue)
Eryngium x zabelii 'Big Blue (Sea Holly 'Big Blue): Large electric-blue thimble-shaped flowers with a spiky collar and silver-green foliage. Long flowering and bee-friendly. Hardy. Up to 75cm
Eryngium x zabelii 'Jos Eijking' (Sea Holly 'Jos Eijking')
Eryngium x zabelii 'Jos Eijking' (Sea Holly 'Jos Eijking'): Large steely blue bracts surround a dome of tiny blue flowers in summer. Long-lasting flowers.Thrives in a sunny,dry spot. To 70cm. Hardy. [Collect Only]
Eryngium x zabelii 'Violetta' (Sea Holly 'Violetta')
Eryngium x zabelii 'Violetta' (Sea Holly 'Violetta'): Deep dark-blue form of the Sea Holly with bracts surrounding a dome of tiny blue flowers. Thrives in sunny, dry gardens. Hardy. Up to 80cm. [Collect Only]
Geranium 'Alan Mayes' (Cranesbill 'Alan Mayes')
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')
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')
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')
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')
Geranium 'Orion' (Cranesbill 'Orion'): A dome of deeply divided foliage, smothered in large blue flowers from early summer onwards
Geranium himalayense 'Baby Blue' (Cranesbill 'Baby Blue')
Geranium himalayense 'Baby Blue' (Cranesbill 'Baby Blue'): Large blue cup shaped flowers with purple veining. Spreading habit, forming a carpet of deeply divided leaves. Hardy. Up to 30cm.
Geranium himalayense 'Gravetye' (Cranesbill 'Gravetye')
Geranium himalayense 'Gravetye' (Cranesbill 'Gravetye'): Purplish blue cup shaped flowers with purple veining. Pink tinged early foliage, spreading habit
Geranium pratense 'Mrs Kendall Clark' (Meadow cranesbill 'Mrs Kendall Clark')
Geranium pratense 'Mrs Kendall Clark' (Meadow cranesbill 'Mrs Kendall Clark'): Palest purpley/grey flowers with beautiful veining, makes a good mound of foliage. Hardy. To 40cm.
Geranium Rozanne = 'Gerwat' (PBR) (Geranium 'Rozanne')
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
Hepatica nobilis
Hepatica nobilis: Pretty bowl shaped blue flowers in early spring.
Iris sibirica (Siberian Iris)
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')
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. [Collect Only]
Nepeta 'Six Hills Giant' (Catmint 'Six Hills Giant')
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.
Nepeta grandiflora 'Summer Magic' (PBR) (Catmint 'Summer Magic')
Nepeta grandiflora 'Summer Magic' (PBR) (Catmint 'Summer Magic'): A more compact, upright growing variety of Catmint with aromatic grey foliage and spikes of lavender blue flowers. Hardy. Up to 35cm.
Nepeta racemosa 'Walker's Low' (Catmint 'Walker's Low')
Nepeta racemosa 'Walker's Low' (Catmint 'Walker's Low'): Forms neat mounds of silvery green foliage, topped with masses of lavender blue flowers in early summer. Up to 60cm. Hardy.
Nepeta x faasenii (Catmint)
Nepeta x faasenii (Catmint): A compact variety of catmint with mounds of aromatic silvery green foliage and lavender blue flowers.Hardy. Up to 45cm.
Nepeta x faasenii 'Purrsian Blue'
Nepeta x faasenii 'Purrsian Blue': A compact variety of catmint with mounds of aromatic silvery green foliage and lavender blue flowers.Hardy. Up to 45cm.
Nepeta x faassenii 'Kit Cat' (Catmint 'Kit Cat')
Nepeta x faassenii 'Kit Cat' (Catmint 'Kit Cat'): A compact variety of catmint making a neat mound of aromatic green foliage and clusters of lavender blue flowers. Hardy. Up to 30cm.
Phlox paniculata 'Blue Paradise' (Phlox 'Blue Paradise')
Phlox paniculata 'Blue Paradise' (Phlox 'Blue Paradise'): An attractive form with bright blue-purple heavily scented flowers. Good for cutting. Hardy. Up to 1.2m.
Polemonium Bressingham Purple = 'Polbress' (Jacob's Ladder 'Bressingham Purple')
Polemonium Bressingham Purple = 'Polbress' (Jacob's Ladder 'Bressingham Purple'): Striking purple foliage topped with purplish blue flowers in early summer. Hardy. To 60cm [Collect Only]
Polemonium reptans 'Stairway to Heaven' (PBR) (Jacob's Ladder 'Stairway to Heaven')
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
Pulmonaria 'Blue Ensign' (Lungwort 'Blue Ensign')
Pulmonaria 'Blue Ensign' (Lungwort 'Blue Ensign'): Rich blue flowers in spring over unspotted dark green foliage. A reliable hardy perennial. Up to 30cm.
Pulmonaria 'Trevi Fountain' (Lungwort 'Trevi Fountain')
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]
Salvia patens 'Cambridge Blue'
Salvia patens 'Cambridge Blue': Beautiful Salvia with pale blue two-lipped flowers flowering in late summer. Needs a sunny, sheltered position and protect with mulch.To 1m.
Salvia uliginosa (Bog Sage)
Salvia uliginosa (Bog Sage): Branched stems of clear blue flowers and lance-shaped leaves. Needs a sunny spot but with moist soil. Late flowering. To 2m.
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. [Collect Only]
Veronica austriaca 'Crater Lake Blue' (Speedwell 'Crater Lake Blue')
Veronica austriaca 'Crater Lake Blue' (Speedwell 'Crater Lake Blue'): Vivid blue spikes above a mound of green foliage.To 30cm. Hardy.