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, it is now a highly invasive weed in tropical and subtropical regions worldwide, thriving in disturbed areas, roadsides, and agricultural lands.
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 has also been used in some cultures for malaria, fever, and gastrointestinal issues.
Active ConstituentsFlavonoids, Alkaloids, Tannins, Essential oils
Preparation Methodsinfusion,poultice,decoction,powder
Contraindications & WarningsCan be toxic to livestock if ingested in large quantities. Some individuals may experience allergic reactions upon topical application. Internal use should be approached with caution due to potential hepatotoxicity in high doses or prolonged use.
Cultivation NotesAs a highly invasive species, it is generally not cultivated intentionally. It thrives in full sun to partial shade, well-drained soils, and warm, humid climates, spreading rapidly by seed and vegetative means.
Raritycommon
Description
Chromolaena odorata is a fast-growing perennial shrub, often forming dense thickets, characterized by its ovate to deltoid leaves. It produces numerous small, white to pale lavender, fluffy flowers clustered in terminal corymbs.
