Helianthus giganteus

Helianthus giganteus, the giant sunflower or tall sunflower, is a species of Helianthus native to the eastern United States and eastern and central Canada, from Newfoundland west to Alberta south to Minnesota, Mississippi, and South Carolina.[2][3][4]

Helianthus giganteus
Helianthus giganteus.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Helianthus
H. giganteus
Binomial name
Helianthus giganteus
  • Helianthus alienus E.Watson
  • Helianthus borealis E.Watson
  • Helianthus subtuberosus (Britton) Britton
  • Helianthus validus E.Watson

Helianthus giganteus is a perennial herbaceous plant that can grow up to 4-5 m (over 13 feet) tall. The leaves are slender, lanceolate. The flower heads are bright yellow, up to 7 cm (2.8 inches) in diameter. They are most commonly found in valleys with wet meadows or swamps[5][4] and even near river banks.


  1. ^ "Helianthus giganteus". The Global Compositae Checklist (GCC) – via The Plant List.
  2. ^ "Helianthus giganteus". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 14 January 2018.
  3. ^ "Helianthus giganteus". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  4. ^ a b Schilling, Edward E. (2006). "Helianthus giganteus". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  5. ^ Wisconsin Plant of the Week: Helianthus giganteus