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Achimenes 'Cattleya' is an orchid pansy related to the African Violet with delicate violet-blue tubular blooms and lighter throats.
Aconitum 'Cloudy' is a gorgeous bicolour monkshood with blue and white flowers.
The tall stems and purple-blue flowers of the monkshood Aconitum 'Arendsii' offer a substitute for Delphinium for shadier conditions.
Aconitum 'Royal Flush' has spires of purple-blue monkshood flowers preceded by luscious chocolate-red new growth.
Aconitum fischeri is a shorter monkshood to two feet with purple-blue flowers.
Japanese monkshood, Aconitum japonicum, has wonderful, hooded purple-blue flowers in summer on arching stems.
Aconitum napellus forms strong, vertical spires of purple-blue monkshood flowers.
'Stainless Steel' is a unique steely blue Aconitum that makes a great spike for sun or shadier conditions.
Aconitum 'Blue Lagoon' is a dwarf monkshood with bright blue flowers.
Aconitum 'Spark's Variety' has four foot tall spikes of hooded, deep violet-blue monkshood flowers.
Agapanthus 'Back in Black' is a hardy lily-of-the-Nile with black stems, black buds, and dark purple-blue flowers followed by black seed pods.
Fireworks of rich cobalt blue flowers on dark stems atop lush, green foliage.
Agapanthus 'Blue Heaven' produces large heads of blue flowers throughout summer. Rebloomer.
'Blue Yonder' is reported hardy to zone 5 and has big, luscious heads of royal blue flowers from July to September. Let's go ROC ("Rest of Canada")! Give it a try.
Agapanthus Fireworks is a striking lily-of-the-Nile with bicolour flowers of violet blue and white.
Agapanthus 'Galaxy Blue' has large umbels of royal blue, trumpet-shaped blossoms. Hardy to zone 6!
'Golden Drops' is a hardy Agapanthus with gold variegated foliage and blue flowers.
Agapanthus 'Little Galaxy' has large umbels of indigo blue, trumpet-shaped blossoms with a blue stripe on each petal. Hardy to zone 6!
Agapanthus 'Moonlight Star' has gorgeous and unique bicolour flowers of pale blue with dark violet blue stripes down the middle of each petal.
Agapanthus 'Northern Star' has gorgeous bicolour flowers of dark blue with dark violet stripes down the middle of each petal.
Agapanthus 'Purple Cloud' is one of the darkest lily-of-the-Nile with rich, purple-blue, tubular flowers.