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Vernonia gigantea (Walter) Trel.
Giant ironweed, Tall Ironweed
USDA Symbol: vegi
USDA Native Status: L48 (N), CAN (N)
Tall erect stem bears deep purple-blue flower heads in loose terminal clusters.
The common name refers to the toughness of the stem. The genus name honors the English botanist William Vernon, who did fieldwork in North America. At least 6 additional species are found in the East; some were once used for treating stomach ailments.
Bloom InformationBloom Color: Purple
Bloom Time: Aug , Sep , Oct
, WV Canada: ON Native Distribution:
New York south to Georgia; west to Louisiana; north to Missouri, Illinois, and Michigan. Native Habitat:
Damp, rich soil.
Growing ConditionsLight Requirement: Sun , Part Shade , Shade
Soil Moisture: Moist
Conditions Comments: Very adaptable, hardy.
BenefitUse Wildlife: Bees
Conspicuous Flowers: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Mt. Cuba Center
- Hockessin, DE
Record Last Modified: 2012-12-09
Research By: TWC Staff