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Aconitum carmichaelii 'Arendsii' (Monkshood)
Aconitum carmichaelii 'Arendsii' (Monkshood): Tall spires of hooded rich blue flowers in late summer. Attractive foliage spring to autumn. To 1.5m. Hardy. [Collect Only]
Aconitum x cammarum 'Stainless Steel'
Aconitum x cammarum 'Stainless Steel': Elegant, light steely grey hooded flowers over finely divided ferny foliage. Good in shade if not too dry. To 1m. [Collect Only]
Agastache 'Black Adder' (Hyssop)
Agastache 'Black Adder' (Hyssop): Bright blue flower spikes and aromatic foliage - very attractive to bees.
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 'Black Scallop' (PBR) (Bugle)
Ajuga reptans 'Black Scallop' (PBR) (Bugle): Shiny, darkest purple-red leaves look near black. Short spikes of blue flowers in summer.
Amsonia hubrichtii (Hubricht's bluestar)
Amsonia hubrichtii (Hubricht's bluestar): Clumps of soft feathery green foliage and blue star-like flowers in late Spring. Textural plant. Attractive autumn colour. Up to 60cm. Hardy
Amsonia tabernaemontana (Blue dogbane)
Amsonia tabernaemontana (Blue dogbane): Starry blue flowers on strong stems with willowy green leaves. Hardy. Up to 90cm. [Collect Only]
Anemone nemorosa 'Robinsoniana' (Wood anemone)
Anemone nemorosa 'Robinsoniana' (Wood anemone): Delicate lavender blue flowers in Spring above clumps of deeply divided foliage. Hardy. Up to 20cm. Dormant in the summer. AGM.
Aquilegia alpina (Granny's bonnet. Columbine)
Aquilegia alpina (Granny's bonnet. Columbine): Lovely delicate bonnet shaped blue flowers in the spring, held on upright stems above blue-green ferny foliage. Hardy. Up to 80cm.
Aster 'Andenken an Alma Potschke'
Aster 'Andenken an Alma Potschke': Large sprays of bright pink double flowers in autumn. Very reliable, easy to grow perennial.
Aster 'Little Carlow' (Also Symphyotrichum 'Little Carlow')
Aster 'Little Carlow' (Also Symphyotrichum 'Little Carlow'): Large sprays of small purplish blue flowers in autumn. Very reliable, easy to grow perennial.
Aster amellus 'Veilchenkonigin' (Italian Aster)
Aster amellus 'Veilchenkonigin' (Italian Aster): Aster with large violet-blue flowers in the autumn and dark-green foliage. Compact. Bee-friendly. Hardy. Up to 40cm. AGM.
Aster macrophyllus 'Twilight' (Also known as Eurybia x herveyi)
Aster macrophyllus 'Twilight' (Also known as Eurybia x herveyi): Lavender-blue flowers with a yellow centre in late summer. Mildew-resistant foliage. [Collect Only]
Aster x frikartii 'Monch' (Michaelmas Daisy.)
Aster x frikartii 'Monch' (Michaelmas Daisy.): Soft lavender blue flowers in late summer.
Aubrieta 'Blue Cascade' (Aubrieta)
Aubrieta 'Blue Cascade' (Aubrieta): A carpet of blue-purple flowers in spring. Great for smothering walls and gravel areas
Baptisia australis (Indigo weed)
Baptisia australis (Indigo weed): Spires of lipped indigo flowers over olive-green foliage. [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. [Collect Only]
Brunnera macrophylla 'Hadspen Cream' (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Hadspen Cream' (Siberian bugloss/Heartleaf): Large, heartshaped green leaves with wide cream margin. Sprays of forget-me-not blue flowers in spring. [Collect Only]
Brunnera macrophylla 'Jack Frost' (PBR) (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Jack Frost' (PBR) (Siberian bugloss/Heartleaf): Large, heartshaped silver leaves with green veins and leaf edges. Sprays of forget-me-not blue flowers in spring. Superb shade-loving plant.
Brunnera macrophylla 'Jack's Gold' (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Jack's Gold' (Siberian bugloss/Heartleaf): A sport of 'Jack Frost' with golden heart-shaped leaves which fade to silver. Small blue forget-me-not-like flowers in Spring. Hardy. Up to 40cm.
Brunnera macrophylla 'Looking Glass' (PBR) (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Looking Glass' (PBR) (Siberian bugloss/Heartleaf): Almost entirely silver leaves, faint green veins. Sprays of forget-me-not blue flowers in spring. Excellent in shade
Brunnera macrophylla 'Silver Wings' (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Silver Wings' (Siberian bugloss/Heartleaf): A fine shade-loving plant. Silver leaves with green veins and a wide green leaf margin. Sprays of forget-me-not blue flowers in spring. [Collect Only]
Brunnera macrophylla 'Variegata' (Siberian bugloss/Heartleaf)
Brunnera macrophylla 'Variegata' (Siberian bugloss/Heartleaf): 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'
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)
Campanula lactiflora 'Prichards Variety' (Milky bellflower): Clusters of warm blue flowers on tall stems in mid-summer.
Campanula persicifolia (Peach-leaved bellflower)
Campanula persicifolia (Peach-leaved bellflower): Tall spikes of large, cup-shaped blue flowers over slender foliage in mid-summer.
Campanula portenschlagiana 'Resholt Variety' (Resholt's bellflower)
Campanula portenschlagiana 'Resholt Variety' (Resholt's bellflower): Carpeting alpine with brilliant blue flowers over a long flowering period in summer.
Catananche caerulea 'Major' (Cupid's dart)
Catananche caerulea 'Major' (Cupid's dart): Masses of papery blue flowers held on wiry stems all summer. Seed heads turn silver in late summer.
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.
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.
Corydalis elata
Corydalis elata: Summer flowering Corydalis with bright blue flowers above soft green foliage. Excellent in some shade in moisture retentive soil.
Corydalis elata 'Blue Summit'
Corydalis elata 'Blue Summit': Stunning electric blue flowers above pretty ferny foliage. Flowers have a coconut-like scent. Great for shady, moist soil. Hardy. Up to 30cm.
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 ritro (Globe Thistle)
Echinops ritro (Globe Thistle): Blue globes held above stout grey green foliage.
Echinops ritro 'Veitch's Blue' (Globe thistle)
Echinops ritro 'Veitch's Blue' (Globe thistle): Dark blue spherical flower heads above attractive grey-green foliage. Good for giving height to a border. Loved by bees and butterflies. [Collect Only]
Eryngium 'Big Blue'
Eryngium 'Big Blue': Large electric-blue thimble-shaped flowers with a spiky collar and spiky silver-green foliage. Long flowering and attractive to bees.
Eryngium bourgatii 'Picos Blue' (PBR) (Sea Holly)
Eryngium bourgatii 'Picos Blue' (PBR) (Sea Holly): Stunning steely blue flowers on blue stems. Spiny glaucous foliage.
Eryngium bourgatii Graham Stuart Thomas's selection (Sea Holly)
Eryngium bourgatii Graham Stuart Thomas's selection (Sea Holly): Spiny, violet blue flowers in summer of even spinier blue-green leaves with white mid-ribs.
Geranium 'Blue Cloud' (Cranesbill)
Geranium 'Blue Cloud' (Cranesbill): Tall cultivar with pale blue flowers & dark purple veining above deeply divided green leaves. Long-flowering. Hardy. Up to 90cm. AGM.
Geranium 'Brookside' (Cranesbill 'Brookside')
Geranium 'Brookside' (Cranesbill 'Brookside'): A reliable, robust variety with large rich blue flowers over a mound of deeply divided leaves.
Geranium 'Gerwat' (ROZANNE) (PBR) (Geranium 'Rozanne')
Geranium 'Gerwat' (ROZANNE) (PBR) (Geranium 'Rozanne'): Noted for its large blue, white centred flowers and very long flowering period. A fine border geranium. Doesn't run.
Geranium 'Nimbus' (Cranesbill 'Nimbus')
Geranium 'Nimbus' (Cranesbill 'Nimbus'): Makes medium sized domes of finely divided foliage smothered in purplish blue flowers in early summer
Geranium 'Orion' (Cranesbill 'Orion')
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')
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.
Geranium pratense 'Mrs Kendall Clark' (Cranesbill 'Mrs Kendall Clark')
Geranium pratense 'Mrs Kendall Clark' (Cranesbill 'Mrs Kendall Clark'): Palest purpley/grey flowers, makes a good mound of foliage
Hepatica nobilis
Hepatica nobilis: Pretty bowl shaped blue flowers in early spring.
Iris sibirica 'Perry's Blue' (Siberian Iris)
Iris sibirica 'Perry's Blue' (Siberian Iris): Lovely pale-blue flowers with white markings over strappy green foliage. Prefers moist soil. Makes a bold clump. Hardy. Up to 85cm.
Iris sibirica 'Silver Edge' (Siberian Iris)
Iris sibirica 'Silver Edge' (Siberian Iris): Rich purple flowers with a fine silver picotee petal edge. [Collect Only]
Limonium platyphyllum (Broad leaved Statice)
Limonium platyphyllum (Broad leaved Statice): A froth of tiny lavender blue flowers on stiff stems in mid-summer
Lupinus 'The Governor' (Lupin 'The Governor' (Band of Nobles Series))
Lupinus 'The Governor' (Lupin 'The Governor' (Band of Nobles Series)): Tightly packed spires of blue and white flowers in midsummer. Long flowering. Hardy. Up to 90cm.
Meconopsis x sheldonii (Himalayan Blue Poppy)
Meconopsis x sheldonii (Himalayan Blue Poppy): Stunning cup shaped true blue flowers above rosettes of hairy green leaves. Needs a moist soil and partial shade to thrive. Hardy. Up to 1m. [Collect Only]
Nepeta 'Six Hills Giant' (Catmint)
Nepeta 'Six Hills Giant' (Catmint): 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' (Catmint)
Nepeta grandiflora 'Summer Magic' (Catmint): 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)
Nepeta racemosa 'Walker's Low' (Catmint): Forms neat mounds of silvery green foliage, topped with masses of lavender blue flowers in early summer
Nepeta x faasenii 'Junior Walker' (Catmint)
Nepeta x faasenii 'Junior Walker' (Catmint): A more compact variety of catmint with mounds of aromatic silvery green foliage and lavender blue flowers.Hardy. Up to 40cm.
Nepeta x faassenii 'Kit Cat' (Catmint)
Nepeta x faassenii 'Kit Cat' (Catmint): A compact variety of catmint making a neat mound of aromatic green foliage and clusters of lavender blue flowers. Hardy. Up to 30cm.
Penstemon heterophyllus 'Heavenly Blue'
Penstemon heterophyllus 'Heavenly Blue': More compact, masses of blue tubular flowers touched with pink. Long-flowering and loved by bees. Protect from hard frosts. To 50cm.
Phlox divaricata 'Clouds of Perfume'
Phlox divaricata 'Clouds of Perfume': Deliciously scented and delicate pale blue flowers which are long-lasting. Prefers some partial shade. Hardy. Up to 30cm.
Phlox subulata 'Lilacina' (Moss phlox)
Phlox subulata 'Lilacina' (Moss phlox): Pale blue star-like flowers above a cushion of hairy narrow leaves. Good for alpine beds or rockeries. Hardy. Up to 15cm.
Poa labillardierei (Blue tussock grass)
Poa labillardierei (Blue tussock grass): Elegant, upright grass with slender blue-green leaves. Arching, open biscuity-coloured panicles in mid-summer. [Collect Only]
Polemonium 'Bressingham Purple' (Polbres) (PBR) (Jacob's Ladder 'Bressingham Purple')
Polemonium 'Bressingham Purple' (Polbres) (PBR) (Jacob's Ladder 'Bressingham Purple'): Striking purple foliage topped with purplish blue flowers in early summer.
Polemonium 'Northern Lights' (Jacob's Ladder 'Northern Lights')
Polemonium 'Northern Lights' (Jacob's Ladder 'Northern Lights'): Heavenly scented, compact form of Jacob's Ladder, with warm blue flowers
Polemonium reptans 'Blue Pearl'
Polemonium reptans 'Blue Pearl': Attractive, low-growing form with fresh green ferny foliage and sky-blue bell-like flowers. Hardy. Up to 30cm. [Collect Only]
Polemonium reptans 'Touch of Class' (PBR) (Jacob's Ladder)
Polemonium reptans 'Touch of Class' (PBR) (Jacob's Ladder): Attractive, low-growing form with variegated ferny foliage and pale-blue bell-like flowers. Hardy. Up to 40cm. [Collect Only]
Pulmonaria 'Blue Ensign' (Lungwort)
Pulmonaria 'Blue Ensign' (Lungwort): Rich blue flowers in spring. A reliable hardy perennial
Pulmonaria 'Cotton Cool' (Lungwort)
Pulmonaria 'Cotton Cool' (Lungwort): Slender leaves, so heavily spotted that they're almost completely silver. Classic pulmonaria purple/blue/pink flowers.
Pulmonaria 'Opal' (Ocupol) (Lungwort 'Opal')
Pulmonaria 'Opal' (Ocupol) (Lungwort 'Opal'): Palest ice-blue flowers over dark green leaves splashed with silver [Collect Only]
Pulmonaria 'Trevi Fountain' (Pulmonaria 'Trevi Fountain')
Pulmonaria 'Trevi Fountain' (Pulmonaria 'Trevi Fountain'): Long flowering, with blue flowers over silver-speckled leaves in spring. [Collect Only]
Scabiosa 'Butterfly Blue' (Scabious Irish Perpetual)
Scabiosa 'Butterfly Blue' (Scabious Irish Perpetual): Large cornflower blue frilled flowers over lance-shaped grey-green foliage. Semi-evergreen, very long flowering season.
Stokesia laevis 'Blue Star' (Stoke's aster)
Stokesia laevis 'Blue Star' (Stoke's aster): Large fluffy blue flowers in mid-summer, slender green leaves.
Stokesia laevis 'Purple Parasols' (Stoke's aster)
Stokesia laevis 'Purple Parasols' (Stoke's aster): Large, fluffy purple flowers over slender grey-green foliage
Tradescantia 'Euridice' (Spiderwort)
Tradescantia 'Euridice' (Spiderwort): Three-petalled delicate pale blue flowers above strappy foliage. Great as a ground clump former in sun or part shade. [Collect Only]
Tradescantia 'Leonara' (Spiderwort)
Tradescantia 'Leonara' (Spiderwort): Three-petalled vibrant violet-blue flowers above strappy foliage. Great as a ground clump former in sun or part shade [Collect Only]
Tragopogon porrifolius (Salsify, 'Jack-go-to-bed-at-noon')
Tragopogon porrifolius (Salsify, 'Jack-go-to-bed-at-noon'): Large, open blue/purple flowers, which close in the afternoon. [Collect Only]
Tricyrtis formosana 'Seiryu' (Toadlily)
Tricyrtis formosana 'Seiryu' (Toadlily): Upright stems of blue star-like flowers, often speckled with lilac and a paler centre. Above dark green spotted foliage. Hardy. Up to 60cm. [Collect Only]
Veronica longifolia (Long-leaved speedwell)
Veronica longifolia (Long-leaved speedwell): Tall spires of blue flowers above long, slender foliage.
Veronica spicata 'Silver Carpet'
Veronica spicata 'Silver Carpet': Low-growing plant with silvery foliage and short spikes of deep purple-blue flowers. Good for edging a border. Hardy. Up to 25cm.
Veronica spicata 'Ulster Dwarf Blue'
Veronica spicata 'Ulster Dwarf Blue': Compact variety with spires of blue flowers above bright green lance shaped foliage. Prefers a sunny spot. Hardy. Up to 30cm.