Siam Weed
Image: Thilanka and Nimali (cc-by-nc)
NameSiam Weed
Scientific NameChromolaena odorata
Common NamesSiam Weed, Christmas Bush, Common Floss Flower, Triffid Weed, Bitter Bush
Plant FamilyAsteraceae
Natural HabitatNative to Central and South America, but widely naturalized and invasive 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 (hemostatic), treating skin infections, malaria, fever, coughs, and gastrointestinal issues. The crushed leaves are often applied topically to cuts and wounds.
Active ConstituentsFlavonoids, Terpenoids, Alkaloids, 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 contact. Internal use should be approached with caution and under expert guidance due to potential toxicity.
Cultivation NotesConsidered an invasive weed in many parts of the world. It grows rapidly in full sun to partial shade, tolerates various soil types, and spreads aggressively by seed and vegetative means. Not typically cultivated for medicinal purposes but rather managed as a weed.
Raritycommon
Description
A fast-growing, perennial shrub or herbaceous plant, often forming dense thickets. It features opposite, ovate to deltoid leaves and produces numerous small, white to pale lavender, fluffy flower heads in terminal corymbs.
