Burdock

Family:
Asteraceae
Origin:
Eurasia

General description

Bushy, much-branched, thistle-like biennial forb < 1.5m tall. Leaves are < 50 cm long. Flowers are spiky green spheres with pink/purple centres and bracts that become hooked when dry, and are borne January – April. Seeds are attached to pappus.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell burdock within the Auckland region.
  • You must not plant burdock 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 burdock 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 margins, scrub, creek beds, pasture, gardens, wasteland, open and disturbed sites.

Seeds dispersed by wind, water, attachment to animals and humans.

Burs contaminate sheep wool and injure livestock. Taints milk if foraged in large quantities. Reservoir for fungal diseases that could impact horticultural plants. Can cause contact dermatitis and toxic seed hairs may be irritating to pets and humans.

Site Management

Maintaining good pasture cover will suppress an infestation. Mowing before flowering will reduce spread of burs. Control is most effective on first year rosettes.

Recommended approaches

Physical control

Method: Dig out

Plant parts requiring disposal: Seeds (burs)

Disposal options: Remove to greenwaste or landfill if practical

Biocontrol

Biocontrol is currently not available for this species.

Community agrichemical control recommendations

No qualifications
Foliar spray with 100ml glyphosate green per 10L of water

Certified Handler/Experienced agrichemical user
Foliar spray with 100ml glyphosate green per 10L of water and 10ml 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

Noogoora bur
Xanthium occidentale

Noogoora bur has inconspicuous flowers. It's burs are less spiny and it is an annual plant.

coltsfoot
Tussilago farfara

Coltsfoot resembles the rosette stage of burdock. However coltsfoot's leaves are broadly heart shaped with palmate veins rather than triangular.

RPMP status


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