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 widely naturalized and invasive in tropical and subtropical regions worldwide, found in disturbed areas, roadsides, agricultural lands, and forest edges.
Parts Usedleaf,flower,whole_plant
Medicinal Actionsanti-inflammatory,antimicrobial,antioxidant,astringent,analgesic
Traditional UsesTraditionally used for wound healing, stopping bleeding, treating skin infections, malaria, fever, coughs, and as an anti-inflammatory agent. Leaves are often crushed and applied topically to cuts and sores.
Active ConstituentsFlavonoids, terpenoids, alkaloids, essential oils
Preparation Methodsinfusion,decoction,poultice,powder
Contraindications & WarningsMay cause allergic reactions in sensitive individuals. Internal use should be approached with caution due to potential toxicity in large doses or prolonged use, especially concerning liver health. Not recommended for pregnant or breastfeeding women.
Cultivation NotesConsidered an invasive weed in many regions, so cultivation is generally not recommended. It thrives in full sun to partial shade, in a wide range of soil types, and is highly adaptable to various environmental conditions.
Raritycommon
Description
A fast-growing perennial shrub or herb, often forming dense thickets. It features ovate to deltoid leaves and produces numerous small, white to pale lavender flowers in terminal corymbs, giving them a fluffy appearance.
