Siam Weed
Image: Thilanka and Nimali (cc-by-nc)
NameSiam Weed
Scientific NameChromolaena odorata
Common NamesSiam Weed, Christmas Bush, Common Floss Flower, Triffid Weed
Plant FamilyAsteraceae
Natural HabitatNative to tropical and subtropical Americas, but widely naturalized and invasive in tropical Asia, Africa, and Oceania. Thrives in disturbed areas, roadsides, forest edges, and agricultural lands.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used for wound healing, stopping bleeding, treating skin infections, malaria, fever, coughs, and gastrointestinal issues. Leaves are often crushed and applied topically to cuts and wounds.
Active ConstituentsFlavonoids, Terpenoids, Alkaloids, Essential oils
Preparation Methodsinfusion,poultice,decoction,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Some studies suggest potential hepatotoxicity with prolonged high-dose internal use, though generally considered safe for topical application. Not recommended for pregnant or breastfeeding women without medical supervision.
Cultivation NotesThis plant is generally considered an invasive weed in many parts of the world, rather than a cultivated medicinal plant. It grows rapidly from seeds or cuttings in warm, humid climates with ample sunlight and can tolerate a range of soil types.
Raritycommon
Description
A fast-growing, perennial, herbaceous shrub or subshrub, often scrambling or climbing. It produces numerous small, white to pale lavender, fluffy flowers in dense terminal clusters, and ovate to deltoid leaves with serrated margins.
