Centaurea 'Montana'

Also known as Blue Cornflower, or Mountain Bluet. This species is low to medium in height and well suited to growing in the sunny border. Plants form a bushy clump of grey-green leaves, setting off a display of clear-blue shaggy flowers in early summer. Removing faded flower heads will encourage repeat blooming. Ruggedly hardy, this plant will grow in most types of soils and climate regions. May self-seed prolifically, so keep an eye out for seedlings appearing where not wanted. Plants may be pruned back hard in mid-summer to maintain a compact habit. Nice for cutting.(Plant description courtesy of Perennials.com)