Tithonia diversifolia (weed)
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Tithonia diversifolia (weed) (Hemsl.) A. Gray - (Mexican sunflower)
This species is native to Central America and has been introduced as an ornamental or green manure into other regions. It has become established in a variety of countries in Africa, Asia and the Australia/Pacific region. It can rapidly colonise disturbed habitats including cropping areas and form dense stands.
The plant is a shallow-rooted annual/perennial broad-leaved plant that grows to a height of 5 m or more. It requires high temperatures and strong light intensities for optimal growth but does not tolerate water stress. It spreads effectively by wind (through the pappus-bearing seeds), animals, waterways, and harvested crops.
