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Centaurea cyanus 'Blue Diadem' (Cornflower, Blue-bottle). Close up of blue flower buds Stock Photo - Alamy
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Centaurea cyanus 'Blue Diadem' (Cornflower, Blue-bottle). Close up of blue flower buds Stock Photo - Alamy
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Centaurea cyanus, 'Blue Diadem' Seeds £1.95 from Chiltern Seeds - Chiltern Seeds Secure Online Seed Catalogue and Shop
![PlantFiles Pictures: Centaurea, Bachelor's Button, Cornflower 'Blue Diadem' (<i>Centaurea cyanus</i>) by AnniesAnnuals PlantFiles Pictures: Centaurea, Bachelor's Button, Cornflower 'Blue Diadem' (<i>Centaurea cyanus</i>) by AnniesAnnuals](https://www.davesgarden.com/pics/2009/05/28/Calif_Sue/8d9226.jpg)