Coefficient of Conservatism:
Coefficient of Wetness:
A native of Eurasia, grown as a garden ornamental and occasionally a conspicuous escape from cultivation to roadsides and disturbed places, including abandoned railroads, filled land, grassy sites. First collected in 1896 in Kent Co.
The corollas, bracts, and anthers all contribute a decidedly bluish look to the large spherical heads, which may be 3–5 cm in diameter.