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 tropical and subtropical America, but widely naturalized and invasive in tropical Asia, Africa, and Oceania. Thrives in disturbed areas, roadsides, agricultural lands, and forest edges.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used for wound healing, stopping bleeding, and treating skin infections, burns, malaria, fever, coughs, and gastrointestinal issues. The leaves are often crushed and applied topically as a poultice.
Active ConstituentsFlavonoids, Alkaloids, Essential oils, Tannins, Saponins
Preparation Methodsinfusion,decoction,poultice,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Internal use should be approached with caution due to potential toxicity in high doses or prolonged use, and is not recommended for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many regions, so cultivation is generally not recommended outside its native range. It is very easy to grow from seed or cuttings in warm, humid climates with ample sunlight.
Raritycommon
Description
A fast-growing perennial herbaceous shrub, often forming dense thickets. It features opposite, ovate-deltoid leaves and produces numerous small, white to pale lavender, fluffy flower heads clustered at the branch tips.
