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Crofton Weed Ageratina adenophora


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Crofton Weed
© USDA APHIS - Oxford, North Carolina Archives/

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Alternate name: Sticky Snakeroot

Family: Asteraceae, Aster view all from this family

Description Introduced. A leafy, woody-based herb or small shrub that bears rounded clusters of white flower heads.
Flowers: small, fuzzy, creamy-white flower heads, in flat-topped branched clusters.
Leaves: triangular, with broad base and pointed tip; toothed edges; opposite.
Height: 1 1/2-5' (0.4-1.5 m).

Warning Plant parts reported to be poisonous if ingested.

Flower June-August.

Habitat Disturbed areas, coastal habitats, wetlands, including temporarily wet areas.

Range Mexico native; naturalized in the United States.

Discussion Also called Sticky Snakeroot, Crofton Weed is considered an invasive or noxious weed in a number of states and is on the U.S. noxious weed list, as well as lists in South Africa, China, and New Zealand. It has been used as garden plant and may have been introduced into the United States for medicinal purposes, but it spreads easily by seed dispersal and may invade and harm native habitats.