Centaurea cyanus (60 days) Open pollinated. Early frilly 2" periwinkle-blue blooms on semi-dwarf 2' plants. A popular favorite with a long bloom period.
Centaurea americana (90 days) Open pollinated. Annual. Resembles a thistle, but no prickles. Grassy honey-like fragrance. Native to south-central U.S. and northeastern Mexico.