Agapanthus 'Blue umbrella' (perennial)
Campanula carpatica 'Blue Clips' (perennial)
Campanula 'Resholdt's Variety' (perennial)
Ceanothus burkwoodii (shrub)
Ceanothus thyrsiflorus 'Repens' (shrub)
Clematis 'Mrs. Chalmondeley' (climber)
Delphinium 'Blue Butterfly' (perenial)
Geranium 'Johnson's Blue' (perennial)
Hebe 'Champion' (blue)
Hydrangea macrophylla 'Blauling' (shrub)
Iris siberica (perennial)
Lavandula angustifolia 'Hidcote' (shrub)
Lithodora diffusa 'Heavenly Blue' (perennial)
Nepeta 'Six Hill Giant' (perennial)
Perovskia atriplicifolia 'Blue Spire' (shrub)
Rosmarinus officinalis (herb)
Scabiosa 'Butterfly Blue' (perennial)
Scilla siberica (bulb)
Stokesia laevis 'Blue' (perennial)
Vinca minor (shrub)
Wisteria sinensis (climber)