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Ageratina altissima (L.) King & H.E. Robins.
USDA Symbol: AGAL5
USDA Native Status: Native to U.S.
Solitary or clustered firm stems bear flat-topped clusters of small fuzzy white flower heads composed entirely of disk flowers.
This plant used to be placed in the genus Eupatorium, as did Smaller White Snakeroot (A. aromatica), a nonaromatic plant despite its name; it has less coarsely toothed leaves, the upper ones stalkless. Other similar species are Late-flowering Thoroughwort (Eupatorium serotinum), which has long-stalked lanceolate leaves with 3-5 main veins, and Hyssop-leaf Thoroughwort (E. hyssopifolium), with very narrow leaves in whorls of 3-4.
Plant CharacteristicsDuration: Perennial Habit: Herb Flower:
Fruit: Size Class:
Bloom InformationBloom Time: Jul , Aug , Sep , Oct
AL , AR , CT , DC , DE , FL , GA , IA , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MS , NC , ND , NE , NH , NJ , NY , OH , OK , PA , RI , SC , SD , TN , TX , VA , VT , WI , WV Canada: NB
, SK Native Distribution:
S. Ontario to New Brunswick; south through New England to Virginia and upland Georgia; west to Louisiana and ne. Texas; north to Wisconsin. Native Habitat:
Woods and thickets. USDA Native Status: L48(N), CAN(N)
Growing ConditionsWater Use: Low
Light Requirement: Sun , Part Shade
Soil Moisture: Dry , Moist
Drought Tolerance: High
Conditions Comments: Prefers full sun but will tolerate shade in more southern locations.
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Record Modified: 2012-06-20
Research By: TWC Staff