Blue
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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 tabernaemontana (Eastern Blue Star)
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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)
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Aquilegia flabellata var. pumila (Columbine)
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Aquilegia x ‘Heavenly Blue’ (Columbine)
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Aster azureus (Sky Blue Aster)
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Aster cordifolius ‘Avondale’ (Blue Wood Aster)