Source: California Invasive Plant Council

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Ageratina adenophora (croftonweed, euphatorium)

Ageratina adenophora
Ageratina adenophora
Photo Joseph DiTomaso

Ageratina adenophora (croftonweed, eupatorium) is a perennial herb or small shrub (family Asteraceae) found along the coast of California and in the South Coast and Transverse Ranges. It prefers disturbed areas, coastal canyons, riparian areas and scrub, and is especially invasive in mild coastal areas. Originally introduced to California as an ornamental plant, croftonweed escaped cultivation by producing abundant seed that is dispersed via wind, water, soil movement, and by clinging to animals and people. This invasive plant is considered noxious in parts of Asia, Australia, New Zealand and Hawaii.

Cal-IPC Inventory rating: Moderate

Cal-IPC Resources on Ageratina adenophora

Cal-IPC News Articles

  • (1993). California Exotic Pest Plant Council draft list exotic plants of greatest concern October 1993. CalEPPC News. 1: 6.

Cal-IPC Symposium Proceedings

  • Bomkamp, T. (1993). The distribution and impacts of escaped exotic Ageratina adenophora in Callifornia: A preliminary assessment. California Exotic Pest Plant Symposium '93. Westlake Village, CA.

Other Resources on Ageratina adenophora