The classic straight species. Centaurea Montana has large, showy, violet-blue flowers in late spring, with spidery deeply fringed flower petals. Will rebloom in fall if cut back after first blooming period. Distinctive.
Centaurea are trouble-free and easy to grow. Unusual buds open to provide fringed, thistlelike blooms.
Can be cut back by 2/3rds after blooming to freshen foliage. Prefers a normal to alkaline soil. Will spread to fill in. Can be divided every 2-3 years in spring or fall.