Pink-Head Knotweed


General description

Trailing evergreen perennial herb that has a urine-like odour. Stems are long and slender. Leaves are < 6 cm long, ovate and alternate, with a reddish, hairy midrib and 'V' pattern. Flowers are pink and borne in ball-like inflorescences in October – March.

What you need to know

Although pink-head knotweed is not a legally declared pest plant, it may still be invasive in some situations. Consider lower risk alternatives for your garden, such as native plants.

Open areas, dry banks, rocky areas.

Sets seed. Vegetative spread from trailing stems. Human-mediated dispersal through dumping of garden waste.

Forms dense mats, displacing native vegetation.

Site Management

Follow up treated areas 3 times per year. Encourage natural regeneration of native plants or replant treated areas where possible after 2-3 treatments to establish dense ground cover and minimise reinvasion.

Recommended approaches

Physical control

Method: Dig out

Plant parts requiring disposal: All parts

Disposal options: Remove to greenwaste or landfill


Biocontrol is currently not available for this species.

Community agrichemical control recommendations

No qualifications
Foliar spray with 10ml glyphosate green per 1L of water

Basic Growsafe certified
Foliar spray in summer with 100ml glyphosate green per 10L of water

Certified Handler/Experienced agrichemical user
Foliar spray with 200ml glyphosate green and 3g metsulfuron-methyl per 10L and 20ml penetrant

CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.

RPMP status

Not a legally declared pest plant
Pink-head knotweed - Main species image