Cornflower (Centaurea cyanus)
Synonyms: Bachelor’s Button | Bluebottle
A winter annual with foliage with cottony hairs, bluish-green; flowers are fringed, bright blue, l in. wide, blooms in 60 days. Common in cultivated ground; established in disturbed sites and roadsides in the U.S. Best in full to partial sun, dry soils; drought-resistant and aggressive.