Chinese knotweed (Persicaria chinensis)

Profile

Impact

Chinese knotweed is a perennial herb up to 1 m high. It has light green leaves, each with a darker green V-shaped blotch in the centre, and clusters of small white or pink flowers. It grows quickly and can climb over other plants. It tolerates a wide variety of environmental conditions and has been found growing from sea level to altitudes of 3000 metres. 

References

Galloway DJ  and Lepper VE (2010). Persicaria chinensis - a new alien Asian invader? In: 17th Australasian weeds conference, SM Zydenbos (ed), New Zealand Plant Protection Society, 174-175.

PlantNET (The NSW Plant Information Network System) (2017). Royal Botanic Gardens and Domain Trust, Sydney. plantnet.rbgsyd.nsw.gov.au 

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Control

Herbicide options

Contact your local council weeds officer for control advice for Chinese knotweed (Persicaria chinensis).

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Biosecurity duty

The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.

Area Duty
All of NSW General Biosecurity Duty
All plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable.
Greater Sydney Regional Recommended Measure*
The plant should be eradicated from the land and the land kept free of the plant. The plant should not be bought, sold, grown, carried or released into the environment. Notify local control authority if found.
Hunter Regional Recommended Measure*
Land managers should mitigate the risk of new weeds being introduced to their land. The plant should be eradicated from the land and the land kept free of the plant. The plant should not be bought, sold, grown, carried or released into the environment. Notify local control authority if found.
North Coast Regional Recommended Measure*
Land managers should mitigate the risk of new weeds being introduced to their land. The plant should be eradicated from the land and the land kept free of the plant. The plant should not be bought, sold, grown, carried or released into the environment. Notify local control authority if found.
*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfill the general biosecurity duty for this weed click here

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Reviewed 2017