Solidago gigantea is a North American plant species in the sunflower family. Its common names include tall goldenrod and giant goldenrod, in reference to its height of up to 2 m tall, rather large for the genus, smooth goldenrod and late goldenrod. It is a widespread species known from most of non-arctic North America east of the Rocky Mountains. It has been reported from every state and province from Alberta to Nova Scotia to Florida to Texas, and also from the state of Nuevo León in northeastern Mexico.
Solidago gigantea is an herb up to 200 cm (80 inches) tall, sometimes spreading by means of underground rhizomes. They often grow in clumps, with no leaves as the base but numerous leaves on the stem. At the top, each stem produces a sizable array of many small flower heads, sometimes several hundred. Each head is yellow, containing both disc florets and ray florets.
- "Solidago gigantea". Tropicos. Missouri Botanical Garden.
- "Solidago gigantea". The Global Compositae Checklist (GCC) – via The Plant List.
- Aiton, Hortus Kewensis 3: 211. 1789.
- Semple, John C.; Cook, Rachel E. (2006). "Solidago gigantea". In Flora of North America Editorial Committee. Flora of North America North of Mexico (FNA). 20. New York and Oxford. Retrieved 2014-11-08 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- "Solidago gigantea". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 18 November 2015.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
- "Solidago gigantea". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
- Photo of herbarium specimen collected in Nuevo León, Mexico
- State of Kentucky
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- Jepson Manual Treatment
- Solidago gigantea in the CalPhotos Photo Database, University of California, Berkeley
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