Helianthus angustifolius is a tall, upright, clump-forming perennial wildflower native to the eastern half of the United States. Growing to between five and eight feet tall, swamp sunflower produces large heads of small, sunflower-type blooms from late summer until the first hard frost, and these blooms are valuable to a wide variety of pollinators. In the fall, flower heads turn to rich seed, which is prized by a variety of songbirds and other wildlife.
Helianthus angustifolius performs best in a good variety of wet, acidic soils, in full sun, and can most often be found in nature in wetlands and near bodies of water. Aside from swamps, swamp sunflower's salt tolerance also makes it a great pick for planting in coastal gardens as well.