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Ageratina altissima (White snakeroot) | NPIN
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Ageratina altissima (White snakeroot)
Smith, R.W.

Ageratina altissima

Ageratina altissima (L.) King & H. Rob.

White snakeroot

Asteraceae (Aster Family)

Synonym(s):

USDA Symbol: agal5

USDA Native Status: L48 (N), CAN (N)

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 Characteristics

Duration: Perennial
Habit: Herb
Flower:
Fruit:
Size Class: 1-3 ft.

Bloom Information

Bloom Time: Jul , Aug , Sep , Oct

Distribution

USA: 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 , NS , ON , 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.

Growing Conditions

Water 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.

Value to Beneficial Insects

Supports Conservation Biological Control

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

National Wetland Indicator Status

Region:AGCPAKAWCBEMPGPHIMWNCNEWMVE
Status: FACU FACU UPL FACU FACU
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 Suppliers Directory

According to the inventory provided by Associate Suppliers, this plant is available at the following locations:

American Native Nursery - Quakertown, PA
Toadshade Wildflower Farm - Frenchtown, NJ

Additional resources

USDA: Find Ageratina altissima in USDA Plants
FNA: Find Ageratina altissima in the Flora of North America (if available)
Google: Search Google for Ageratina altissima

Metadata

Record Modified: 2012-06-20
Research By: TWC Staff

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