Ageratina adenophora (Spreng.) R.King & H.Rob.

Crofton Weed

Phytologia 19: 211 (1970) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Sparingly established

Perennial herb or subshrub to 2.5 m high; stems usually purplish when young, glandular-pubescent. Leaves opposite, triangular to rhombic, to 12 cm long, 6 cm wide, sparsely puberulent; margin serrate; petiole 10–25 mm long; base cuneate to obtuse or nearly truncate; apex acute to acuminate. Inflorescence of numerous capitula; capitula 5–8 mm diam.; involucre campanulate, 3.5–4 mm long; bracts linear or linear-lanceolate, green to reddish, glandular-pubescent. Florets 40–50, white to purplish, c. 3.5 mm long. Cypselas cylindric, 1–2 mm long, black-brown, glabrous; pappus of bristles, 3–4 mm long, white. Flowers Sep.–Apr.

*GipP. Also naturalised SA, Qld, NSW. Native to Mexico. A garden escape that has occasionally spread to disturbed sites throughout the Melbourne metropolitan area.

Created by: Daniel Ohlsen, 2015-12-11
Updated by: Val Stajsic, 2018-05-09
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
superorder Asteranae
order Asterales
family Asteraceae
genus Ageratina
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Ageratina adenophora in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Ageratina adenophora in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Victorian Volcanic Plain present cultivated
Gippsland Plain present introduced

State distribution

Distribution map
Western Australia
South Australia
New South Wales
Australian Capital Territory