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White Snakeroot

Ageratina altissima

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Category
Forb / Wildflower
Sun
Partial to Shade
Soil moisture
Medium-Wet to Medium-Dry
Bloom time
Jul–Oct
Bloom color
White
Notes
Short-lived, Poisonous, Aggressice, Rhizomatous

About White Snakeroot

White Snakeroot is a resilient and prolific woodland native that brightens shaded gardens with clouds of snowy white flowers from late summer until the first frost. Typically growing three to five feet tall, it features attractive, dark green, heart-shaped leaves on sturdy stems. The small, fuzzy flower heads are held in flat-topped clusters, providing a critical late-season nectar source for bees, moths, and butterflies. Native to rich woods and thickets across eastern and central North America, it is highly adaptable and thrives in conditions ranging from deep shade to partial sun. It is particularly valued for its ability to grow in the difficult dry shade found under large trees. While historically famous for causing 'milk sickness' in livestock if ingested, it is a safe and valuable plant for home landscapes where it can naturalize. It spreads by seed and rhizomes, making it an excellent choice for filling large shaded areas. For best results, plant in moist to medium-dry soil and enjoy the luminous late-season display it provides.

Native range

Native to 38 states:

AlabamaArkansasConnecticutD.C.DelawareFloridaGeorgiaIowaIllinoisIndianaKansasKentuckyLouisianaMassachusettsMarylandMaineMichiganMinnesotaMissouriMississippiNorth CarolinaNorth DakotaNebraskaNew HampshireNew JerseyNew YorkOhioOklahomaPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasVirginiaVermontWisconsinWest Virginia

County range map

BONAP county-level native range map for Ageratina altissima

Range map courtesy of BONAP (Biota of North America Program).

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