Blue
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Aconitum carmichaelii ‘Arendsii’ (Monkshood)
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Aconitum x cammarum ‘Bicolor’ (Monkshood)
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Agapanthus x ‘Black Buddhist’ (Lily of the Nile)
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Agapanthus x Silver Moon ‘Notfred’ (Lily of the Nile)
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Agastache x ‘Blue Fortune’ (Anise Hyssop)
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Amsonia hubrichtii (Blue Star)
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Amsonia illustris (Ozark Bluestar)
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Amsonia tabernaemontana (Eastern Blue Star)
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Amsonia x ‘Blue Ice’ (Bluestar)
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Amsonia x ‘String Theory’ (Blue Star)
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Amsonia x Butterscotch™ (Blue Star)
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Aquilegia alpina (Columbine)