On Feb 7, 2005, Emaewest from Timberlea, NS (Zone 6a) wrote:
Excerpted from "Roland's Flora of Nova Scotia":
"Centaurea cyanus is a beautiful, blue flowered garden annual. It is a slender, much-branched annual, 20-100 cm tall, with undivided, linear leaves. Although usually blue, they may be pink or white. Introduced from Europe."