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Siam weed (Chromolaena odorata)

Invasive Assessment | Impact Assessment

Scientific name:Chromolaena odorata (L.) R.M. King & H.

Common Name:

Siam weed


Not declared noxious in Victoria


Can occur in most tropical and sub-tropical terrestrial habitats below 1,000 m altitude, except for undisturbed rainforest. Requires at least 1,200 mm annual rainfall, but tolerates severe dry seasons. Grows in many soil types but prefers well-drained soils. (ISSG 2000) Native in grasslands, savannas and forest margins (Weber 2003).
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