Siam Weed (Chromolaena Odorata) is a perennial shrub in the Asteraceae family with easy care difficulty. It requires moderate watering and full sun or partial shade light in USDA hardiness zones 9-12. This plant is toxic to cats and dogs — keep it out of reach of pets.

Chromolaena odorata is a fast-growing perennial shrub native to the Americas, widely invasive in tropical regions.

Siam Weed

Siam Weed

Chromolaena Odorata

Chromolaena odorata is a fast-growing perennial shrub native to the Americas, widely invasive in tropical regions.

Quick Facts

Type
shrub
Lifecycle
perennial
Care Difficulty
Easy
Water Needs
Moderate
Light
Full Sun, Partial Shade
Hardiness Zones
9-12

Safety

⚠️
Not Pet Safe
⚠️
Not Child Safe
☠️
Toxic

Growing Conditions

Soil Types:sandy, loamy, clay
Indoor:No
Outdoor:Yes
Garden Use:groundcover, erosion control

Care Calendar

Monthly care tasks for Siam Weed

Jan
Prune
Feb
Fertilize
Mar
Repot
Apr
Water+
May
...
Jun
...
Jul
...
Aug
...
Sep
...
Oct
...
Nov
...
Dec
...

Expert Care Tips

Pro tips from botanists and plant experts

Watering Tip

Check soil moisture by inserting your finger 1 inch deep. Water only when the top layer feels dry to prevent overwatering.

Humidity Trick

Group plants together to create...

Growth Hack

Rotate your plant every...

Photo Gallery10+ photos

Siam Weed
Siam Weed detail

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Taxonomy

Family:Asteraceae
Genus:Chromolaena