Chinese Knotweed

Also known as:
Liane Rouge, Red Bush, Huo Tan Mu

General description

Perennial, scrambling, mat-forming, herbaceous vine < 1 m tall or climbing to < 10 m. Rhizomes are stout. Leaves are ovate, lanceolate or elliptic, < 16 x 8 cm and smooth or covered in stiff hairs. Flowers are small, white/pink and borne in inflorescences in autumn.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell Chinese knotweed. As Chinese knotweed is an Unwanted Organism, these restrictions apply within the Auckland region and across the whole of New Zealand.
If you see Chinese knotweed anywhere, you must report it to the Ministry of Primary Industries on 0800 80 99 66.

Forests, riparian margins, grasslands, disturbed sites, crops, roadsides, urban areas.

Seeds dispersed by birds. Vegetative spread from stem and root fragments. Human-mediated dispersal through dumping of garden waste and deliberate plantings.

Forms dense mats, smothering native vegetation and suppressing seedling recruitment.

Site Management

Recommended approaches

Do not attempt to undertake control of this species. The Ministry of Primary Industries will carry out the control of this species.

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

RPMP status

Unwanted Organism
Chinese knotweed - Main species image