Woolgrass Bulrush is a plant of edges and margins, equally at home in standing water and soggy meadow soils. Growing 3 to 6 feet tall, it colonizes stream banks, pond margins, and marsh fringes across zones 4 through 8 by spreading steadily via creeping rhizomes. The brown-copper flower heads emerge in summer and develop into the soft, fleece-like clusters that give the plant its common name.

In the garden it works hardest as a structural presence through the dormant months, when most other plants have retreated entirely. Plant it in full sun for the densest growth, though it will adapt to some afternoon shade in climates with punishing summers. Small mammals are drawn to the seed heads. It asks almost nothing in the way of maintenance and tolerates the wet, heavy soils that challenge most ornamentals.