Siam Weed
Image: Thilanka and Nimali (cc-by-nc)
NameSiam Weed
Scientific NameChromolaena odorata
Common NamesSiam Weed, Bitter Bush, Christmas Bush, Jack-in-the-bush
Plant FamilyAsteraceae
Natural HabitatNative to Central and South America, it has become a highly invasive weed in tropical and subtropical regions worldwide, thriving 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 due to its astringent and antimicrobial properties. It is also employed in some traditional systems for malaria, fever, coughs, and gastrointestinal issues. The leaves are commonly 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. Internal use should be approached with caution due to potential toxicity in high doses or prolonged use. Not recommended for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many regions, so intentional cultivation is generally not recommended outside its native range. It grows readily from seed or cuttings in warm, humid climates with ample sunlight and well-drained soil.
Raritycommon
Description
A fast-growing perennial shrub or herb, often forming dense thickets. It features clusters of small, white to pale lavender flowers with prominent stamens, and ovate to lanceolate leaves arranged oppositely along the stem.
