Siam Weed
Image: Thilanka and Nimali (cc-by-nc)
NameSiam Weed
Scientific NameChromolaena odorata
Common NamesSiam Weed, Christmas Bush, Bitter Bush, Triffid Weed
Plant FamilyAsteraceae
Natural HabitatNative to Central and South America, but widely naturalized and invasive in tropical and subtropical regions worldwide. It thrives in disturbed areas, roadsides, pastures, and forest edges.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used for wound healing, cuts, burns, and skin infections due to its antiseptic and anti-inflammatory properties. In some traditional medicine systems, it is also used for fever, coughs, and gastrointestinal issues.
Active ConstituentsFlavonoids, Terpenoids, Alkaloids, Essential oils
Preparation Methodsinfusion,poultice,decoction,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Internal use, especially in high doses or for prolonged periods, may carry risks of hepatotoxicity. Not recommended for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many tropical and subtropical regions, so cultivation is generally discouraged outside its native range. It is hardy and thrives in full sun to partial shade with well-drained soil.
Raritycommon
Description
A fast-growing, perennial shrub or herbaceous plant, often forming dense thickets. It features numerous small, white to pale lavender flowers clustered in terminal corymbs and opposite, ovate leaves.
