Blues

Allium christophii

Allium schoenoprasum 'Forescate'

Amaranthus 'Hopi Red Dye'

Beta vulgaris 'MacGregor's Favourite'

Calamintha

Centaurea cyanus 'Black Ball'

Cleome spinosa 'Violet Queen'

Dahlia 'Bishop of Llandaff'

Foeniculum vulgare 'Purpureum'

Geranium psilostemon

Godetia tenella 'Lady in Blue'

Helianthus annus 'Claret'

Heliotropium x hybrida 'Marine'

Iresine herbstii

Knautia macedonica

Kohl rabi 'Purple Danube'

Limonium latifolium

Limonium sinuatum 'Azure'

Lobelia siphilitica

Nigella damascena 'Oxford Blue'

Papaver paeoniflorum 'Black Paeony'

Perilla frutescens nankinensis

Rhodochiton atrosanguineum

Ricinus communis 'Impala'

Salvia x sylvestris 'May Night'

Scabiosa atropurpurea 'Ace of Spades'

Scaevola

Trachelium caeruleum 'Passion in Violet'

Verbena bonariensis