
Appearance
The flowers appear in the summer and are purple, blue, or white in nature. The plant is cultivated as a garden flower. Several cultivars are available, including the cornflower blue 'Klaus Jelitto', 'Colorwheel', which is white, turning purple over time, and 'Blue Danube', which has a blue flower head with a white center. More unusual cultivars include the pink-flowered 'Rosea' and yellow-flowered 'Mary Gregory'.References:
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