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1 Gallon Pot. Centaurea montana is an erect, stoloniferous, clump-forming perennial which features solitary, fringed, rich blue cornflowers (2″ diameter) with reddish blue centers and black-edged involucre bracts. Flowers appear in late spring atop unbranched stems typically growing 1-2′ tall. Gray-green, lance-shaped lower leaves to 7″ long. Commonly called mountain bluet, perennial cornflower or perennial bachelor’s button.