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Deinanthe caerulea is a rare hydrangea relative with beautiful foliage and cool, purple-blue flowers.
Delphinium elatum 'Million Dollar Blue' blooms with dense, strong spikes of vibrant, true blue, semi-double to double flowers.
Delphinium elatum 'Million Dollar Sky' blooms with dense, strong spikes of light-blue, semi-double to double flowers.
Delphinium 'Blue Mirror' has deep sky blue flowers with hints of lavender and small white centres on short spires up to 24" tall.
Delphinium grandiflorum ‘Summer Cloud’ offers shades of medium blue with a white bee at the centre of each flower.
Delphinium Highlander 'Bolero' is a magnificent cultivar with ruffly, fully double flowers in shades of lavender purple, blue, and creamy white.
Delphinium Highlander 'Moonlight' is magnificent with ruffled, fully double flowers in shades of lilac blue with apple-green centres.
Delphinium New Millennium 'Blue Lace' blooms with dense spikes of sky blue flowers with a touch of lavender pink.
Delphinium New Millennium 'Cobalt Dreams' blooms with dense spikes of frilly, royal blue to cobalt blue, single flowers with white centres.
Dichroa febrifuga 'UBC Form' is a rare hydrangea relative with clusters of pink or blue flowers followed by long-lasting metallic, purplish berries.