Swaziland's Alien Plants Database

Ageratum conyzoides L.

ASTERACEAE

tropic ageratum, goat weed, billygoat weed, tropical whiteweed, blue top

Disturbed areas, Minor problem species

Origin: Tropical America

Growth Form: Herb

Plant Description: Plant: Softly hairy, slightly aromatic, annual herb with fluffy flowerheads; stems green, purplish or reddish, 0.3–1.0 (–1.5) m high. Leaves: Bright green, ovate, in opposite pairs, margins shallowly toothed or scalloped. Flowers: Mauve, blue, pinkish or white in compact terminal flowerheads, all year; heads 4–5 mm across with slender, hardly exserted styles. Fruit: Brown, one-seeded achenes.

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More information:
Weeds & Invasive Plants Home Page

Photo - flowers/leaves