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

Baptisia 'Indigo Spires' (Indigo weed 'Indigo Spires'): Spikes of violet-blue pea-like flowers with a yellow edge above a mound of grey-green foliage. Long flowering. Hardy. Up to 1.2m [Collect Only]

Baptisia australis (Indigo weed): Spires of lipped indigo flowers over olive-green foliage. Flowering height 1.2m.

Campanula portenschlagiana 'Resholdt's Variety' (Wall bellflower 'Resholdt's Variety'): Carpeting alpine with brilliant blue flowers over a long flowering period in summer.

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

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

Geranium himalayense 'Gravetye' (Cranesbill 'Gravetye'): Purplish blue cup shaped flowers with purple veining. Pink tinged early foliage, spreading habit

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.

Linum perenne 'Blau Saphir' (Syn. L. perenne 'Blue Sapphire') (Perennial flax): Slender wand like stems, topped with open faced blue flowers in summer. To 30cm. Hardy.

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'): 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'): Forms neat mounds of silvery green foliage, topped with masses of lavender blue flowers in early summer. Up to 40cm. Hardy.

Nepeta x faasenii 'Junior Walker' (Catmint 'Junior Walker'): 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 '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.

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

Veronica austriaca 'Crater Lake Blue' (Speedwell 'Crater Lake Blue'): Vivid blue spikes above a mound of green foliage.To 30cm. Hardy.