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, Triffid Weed
Plant FamilyAsteraceae
Natural HabitatNative to Central and South America, now a pantropical invasive weed. Thrives in disturbed areas, roadsides, agricultural lands, forest edges, and open fields in tropical and subtropical climates.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent
Traditional UsesTraditionally used in various folk medicines for wound healing, stopping bleeding, treating skin infections, malaria, fever, and as an anti-inflammatory. The crushed leaves are often applied topically to cuts and wounds.
Active ConstituentsFlavonoids, Essential oils, Tannins, Alkaloids, Saponins
Preparation Methodsinfusion,decoction,poultice,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Some studies suggest potential hepatotoxicity with prolonged internal use of large quantities, though generally considered safe for topical application. Avoid during pregnancy and lactation due to insufficient data.
Cultivation NotesConsidered an invasive weed in many regions, so cultivation is generally not recommended. It grows vigorously from seed or stem cuttings in full sun to partial shade and well-drained soils.
Raritycommon
Description
A fast-growing, perennial shrub or herbaceous plant, often forming dense thickets. It features opposite, ovate-lanceolate leaves and clusters of small, white to pale lavender flowers with prominent pappus hairs.
