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Chromolaena odorata
Siam weed
Chromolaena odorata
Chromolaena odorata, also known as Siam Weed, is a fast-growing perennial shrub native to the Americas but now found in many tropical and subtropical regions. It is known for its prolific growth and production of seeds, making it a successful colonizer. The plant features opposite, ovate leaves and clusters of white or purplish flowers. While it has some uses in traditional medicine, it is often considered a weed due to its rapid spread and ability to outcompete other plants.
CategoryDetails
Plant TypePerennial plant
Medicinal UsageMedicinal Usage
Estimated Plant Lifespan2 years lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: Wind and insects

Notes: The flowers are primarily pollinated by insects, especially bees, and wind.

Watering Requirements

Method: Water at the base of the plant

Frequency: When the soil is dry to the touch

Notes: Avoid overwatering to prevent root rot.

Humidity Requirements

Level: Moderate

Maintenance: No special methods are usually needed.

Care InstructionsPrune regularly to control growth and promote bushier shape. Remove dead or diseased leaves.
Temperature Range

Min: 18°C

Max: 35°C

Alternative NamesTriffid weed, Crucita, Jack-in-the-bush, Eupatorium odoratum, Eupatorium conyzoides, Kingsweed, Armstrong's Weed, Chromolaena, Paraffin Weed, Paraffinbush, Turpentine Weed
Senna siamea
Kassod Tree
Senna siamea
Kassod Trees can be planted alongside Siam Weed to provide shade and compete with it. They can eventually outgrow the weed.
Imperata cylindrica
Cogon Grass
Imperata cylindrica

Cogon grass can compete with Siam Weed for resources like sunlight, water, and nutrients, but the weed can quickly overtake it.

Cenchrus purpureus
napier grass
Cenchrus purpureus

Elephant grass and Siam Weed compete for space, sunlight, and nutrients. Elephant grass is a strong competitor and can grow quickly.

Leaf-cutter ants

Leaf-cutter ants may feed on the leaves, causing defoliation. They will remove leaf material, carrying it back to their nests, damaging the plant's photosynthetic capability.

Stem borers

Stem borers can tunnel into the stems, weakening the plant and potentially leading to stem breakage or plant death.

Steps:

    • Select healthy, non-flowering stems.
    • Cut stems about 10-15 cm long, removing leaves from the bottom half.
    • Dip the cut end in rooting hormone (optional).
    • Plant the cuttings in a well-draining potting mix.
    • Keep the soil moist but not waterlogged.
    • Provide indirect sunlight.
    • Roots should develop in a few weeks.

Neem Oil

Neem Oil can be used as a natural insecticide to control some pests that may affect Siam Weed.

Balanced Fertilizer

A balanced fertilizer can help provide necessary nutrients to the plant, supporting healthy growth and potentially increasing its ability to compete with other plants.