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 America, it is now a pantropical invasive weed found in disturbed areas, roadsides, agricultural fields, forest edges, and open woodlands. It thrives in warm, humid climates.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used for wound healing, cuts, burns, skin infections, and to stop bleeding. It is also used internally for coughs, colds, malaria, and as an anti-diarrheal, though external use is more common and better documented.
Active ConstituentsFlavonoids, Alkaloids, Tannins, Essential oils, Saponins
Preparation Methodspoultice,infusion,decoction,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Internal use should be approached with caution due to potential toxicity and lack of extensive human safety data. Not recommended for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many regions, it grows readily from seed or cuttings. It prefers full sun to partial shade and well-drained soils. It is generally not cultivated for medicinal purposes but rather managed as a weed.
Raritycommon
Description
Chromolaena odorata is a fast-growing perennial shrub or herb, often forming dense thickets. It features ovate to deltoid leaves with serrated margins and produces numerous small, white to pale lavender, fluffy flowers in terminal corymbs.
