A very bad weed along creeks, rapidly invades, somewhat resistant to Glyphosate-based herbicides, becomes a dense monoculture. Very difficult to remove. Native to South America.
Stems are rounded, sometimes hairy, sometimes reddish. The stems can trail (grow) to 4m, rooting at the nodes. The main stem supports secondary short flowering branches.
Image: Flowers and foliage
Leaves are opposite, with three lobes and serrated margins.
All parts of the plant must be removed, cooked out in mulch piles, or taken off site.
Image: Flower Close-up
The daisy flower-heads are born on single stalks, with up to 13 petals (ray florets). Seeds are capped with a crown of short scales.