Siam Weed
Image: Thilanka and Nimali (cc-by-nc)
NameSiam Weed
Scientific NameChromolaena odorata
Common NamesSiam Weed, Bitter Bush, Christmas Bush, Jack-in-the-Box
Plant FamilyAsteraceae
Natural HabitatNative to Central and South America, now an invasive weed in many tropical and subtropical regions worldwide, found in disturbed areas, roadsides, pastures, and forest edges.
Parts Usedleaf,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used for wound healing, stopping bleeding, treating skin infections, malaria, fever, and coughs. Leaves are often crushed and applied topically to cuts and wounds.
Active ConstituentsFlavonoids, Essential oils, Tannins, Alkaloids
Preparation Methodsinfusion,poultice,decoction,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Internal use should be cautious due to potential toxicity in large doses, particularly for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many areas, so cultivation is generally discouraged. It thrives in tropical and subtropical climates, tolerates various soil types, and spreads rapidly by seed.
Raritycommon
Description
A fast-growing perennial shrub, often forming dense thickets. It has hairy stems, ovate-lanceolate leaves, and produces clusters of small, white to pale lavender, fluffy flowers.
