Blue

Delphinium grandiflorum 'Delfix Blue'

Grand-flowered delphinium

Eryngium planum 'Blue Hobbit'

Blue eryngo, Flat sea holly

Eryngium planum 'Jade Frost'

Blue eryngo, Flat sea holly

Eryngium x zabelii 'Big Blue'

Sea holly, Eryngo

Geranium 'Johnson's Blue'

Geranium 'Orion'

Geranium himalayense 'Baby Blue'

Lilac cranesbill, Himalayan cranesbill

Geranium Rozanne = 'Gerwat'

Geranium wallichianum 'Buxton's Variety'

Wallich's geranium

Hebe 'Frozen Flame'

Hebe 'Little Red Rum'

Hebe 'Silver Queen'

Hibiscus syriacus 'Oiseau Bleu'

Rose of Sharon, Tree hollyhock

Hydrangea aspera subsp. sargentiana

Sargent's hydrangea, Rough leaved hydrangea

Hydrangea macrophylla 'Baby Blue'

Hortensia hydrangea, Mophead hydrangea

Hydrangea macrophylla 'Blaumeise'

Lacecap hydrangea

Hydrangea macrophylla 'Mathilda Gutges'

Hortensia hydrangea, Mophead hydrangea

Hydrangea macrophylla 'Zorro'

Lacecap hydrangea

Hydrangea macrophylla Early Blue = 'Hba 202911'

Hortensia hydrangea, Mophead hydrangea

Lavandula x chaytoriae 'Sawyers'

Lavender

Lithodora diffusa

Spreading lithodora, Acid-loving lithodora

Lithodora diffusa 'Heavenly Blue'

Spreading lithodora, Acid-loving lithodora

Lithodora diffusa 'Star'

Spreading lithodora, Acid-loving lithodora

Lobelia x speciosa 'Fan Blau'

Hardy bronze leaf lobelia

Lupinus 'The Governor'

Lupin

Malva sylvestris var. mauritiana 'Primley Blue'

Blue mallow, Common mallow, Tall mallow, High mallow, Cheeses

Myosotidium hortensia

Giant forget-me-not, Chatham Island forget-me-not, Antarctic forget-me-not

Nepeta grandiflora 'Summer Magic'

Caucasus catmint, Giant catmint

Nepeta racemosa 'Walker's Low'

Persian catmint

Nepeta subsessilis

Short stalked catmint

Paulownia tomentosa

Foxglove tree, Empress tree, Princess tree, Empress tree

Perovskia 'Blue Spire'

Azure sage

Perovskia atriplicifolia 'Little Spire'

Russian sage, Azure sage

Perovskia Lacey Blue = 'Lisslitt'

Russian sage

Platycodon grandiflorus

Balloon flower, Chinese bellflower, Japanese balloon flower

Polemonium caeruleum 'Bambino Blue'

Jacob's ladder

Pulmonaria 'Blue Ensign'

Lungwort, Jerusalem cowslip

Pulmonaria 'Majeste'

Lungwort, Jerusalem cowslip

Rhododendron Blue Tit Group

Rhododendron impeditum

Tangled rhodendron

Rosa Rhapsody in Blue = 'Frantasia'

Floribunda (cluster-flowered) rose

Salvia 'Amistad'

Sage

Salvia guaranitica 'Black and Blue'

Anise-scented sage

Salvia nemorosa 'East Friesland'

Wild sage, Violet sage, Wodland sage, Perennial salvia

Salvia nemorosa 'Sensation Blue'

Wild sage, Violet sage, Woodland sage, Perennial salvia

Salvia patens 'Cambridge Blue'

Gentian sage, Blue sage

Salvia x superba 'Merleau Blue'

Perennial sage

Scabiosa 'Butterfly Blue'

Pincushion flower, Scabious, Mourning bride