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Mist Flower

Also known as:
Mistweed, River Eupatorium
Mexico, West Indies

General description

Many-stemmed, perennial, erect or scrambling herb about 1.5 m tall. Stems are purple, hairy, opposite and woody when mature. Leaves are willowy, serrated, about 10 x 2.5 cm and opposite. Flowers are small, white and borne in clusters in August – January. Seeds are black and five-angled.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell mist flower within the Auckland region.
  • You must not plant mist flower within the Auckland region, unless you are transferring an existing plant on your land to another location within the boundaries of the same property.
  • You must destroy any mist flower on land that you occupy if it has been planted in breach of the above rules and you are directed to do so by an authorised person.

Forest, forest margins, shrublands, wetlands, riparian margins, coastal areas, estuaries, slips, alluvial flats, light gaps.

Seeds dispersed by wind and water. Vegetative spread from layering of trailing stems.

Forms dense colonies, smothering native plants and preventing native regeneration. Causes sediment build-up, altered flow regimes and potentially flooding along riparian margins.

Site Management

Easiest to control at onset of flowering from August to January. 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


Check for presence of agents:
Mist flower fungus (Entyloma ageratinae)
Mist flower gall fly (Procecidochares alani)

Community agrichemical control recommendations

Basic Growsafe certified
Foliar spray with 200ml glyphosate green per 10L of water

Certified Handler/Experienced agrichemical user
Foliar spray with 200ml glyphosate green per 10L of water 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.

Similar species

Mexican devil
Ageratina adenophora

Mexican devil has larger leaves with rounded teeth and larger flowers

RPMP status

Whole region (Sustained Control)
Hauraki Gulf Controlled Area Notice pest
Mist flower - Main species image