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 Bluestar)
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Aster laevis ‘Bluebird’ (Smooth Aster)
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Aster macrophyllus (Bigleaf Aster)
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Aster oblongifolius ‘October Skies’ (Aromatic Aster)
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Baptisia australis (Blue False Indigo)
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Brunnera macrophylla ‘Jack Frost’ (Siberian Bugloss)
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Ceratostigma plumbaginoides (Plumbago)
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Eupatorium coelestinum (Blue Mistflower)