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Bachelor's Buttons, Cornflower, or Garden Cornflower (Centaurea cyanus)


Family: Asteraceae (Daisies)
Genus: Centaurea
Species: cyanus
Type: Annual
Flowering: Early Summer to Frost
Zones: All (1-11)
Light: Full Sun to Partial Shade
Soil: Can Tolerate Poor Soil, Well-Drained
Height: 1-3 feet H x 1 foot W
Propagation: Seed
Colors: White, Pink, Red, Purple, Blue, Bicolored
Origin: Europe

Bachelor's buttons is a hardy annual able to tolerate droughts and poor soil. Self-seeding easily, it flowers from early summer until frost if deadheaded to prolong blooming. Although it can become invasive, its ease of cultivation make it especially suitable for the beginning gardener. If you want a plant that is attractive, good as a cut flower, and tolerant of extreme conditions, bachelor's buttons is the ideal candidate for your Iowa garden.

Please note that the Zones listed above are USDA Hardiness Zones and are only given as a rough indication of whether a plant will grow and thrive in your area. Temperature variations and unusual weather conditions can affect plant survival. To assist plant survival during the winter, you may wish to place mulch over the areas in question or plant the flowers in an area away from walls or cement. Additionally, digging up bulbs and roots to overwinter indoors may be preferrable to keeping them in the ground.