A very pretty hardy perennial. My wintersown ones bloomed the second year from seed. They are tall flowers on very thin stems and tend to flop. Mine is planted at the back of the bed, but probably would be better in the middle of the bed so that surrounding plants would support the floppy stems. After most flowers have faded, the plant benefits from shearing back. They will soon rebloom heavily as shorter flowers. Very pretty in bouquets.
Planted my Knautia in with my asters. The thin wiry stems stand above and around the asters giving interest during the summer. Then when the knautia is finishing up with it's bloom cycle, the asters start their flowering.