Kudzu is a vine with large leaves that can climb up to 30 m high or form very dense mats over the ground. It grows very quickly smothering and killing plants and damaging infrastructure.
Kudzu grows very quickly, up to 30 cm per day and it:
Kudzu is a semi-woody perennial vine. It is deciduous in cool regions and during extended dry periods. Kudzu can climb up trees and over other structures up to 30 m high. It also can form extremely dense mats up to 2 m deep on the ground.
Leaves are alternate along the stem and are made up of three leaflets which are:
Seed split on both sides when they release their seeds.
These plants look similar but they have smaller leaves that are not lobed and they do not have a yellow spot on the flowers:
Kudzu has been found in coastal regions of NSW, mostly on the North and Central Coasts.
It is native to south-east China and southern Japan. It may also be native to south-east Asia, Papua New Guinea and other Pacific islands but it is also possible that the plants were introduced to these countries as a food source. It was most likely introduced to Australia as a fodder crop and to limit erosion.
Kudzu can grow in a wide range of climates including tropical, subtropical and warm temperate regions. It grows best in areas with mild winters, hot summers (over 25°C), and an annual rainfall over 1000 mm. Although it is very sensitive to frost, frost-damaged plants can reshoot from tubers in spring. It can also tolerate dry periods by dropping its leaves.
It grows in many soil types and thrives in deep, loamy, well-drained soils. It does not grow well in waterlogged or highly alkaline soils.
Although kudzu is most vigorous in full sun, it can grow in partial shade. It often grows along waterways and in disturbed areas such as roadsides. In NSW it has also been found in open pastures, sclerophyll forests and subtropical rainforests.
Kudzu is mostly spread by people intentionally planting it for ornamental purposes, or for food for people and livestock.
Kudzu plants start producing seeds after three years. Seed viability is generally low, but occasionally some seeds remain viable for several years. Seeds can be spread by water, contaminated soil or contaminated fodder or mulch.
New plants can grow from stems and tubers and many vines can grow from one tuber. Contaminated soil moved by earth moving equipment can spread the tubers.
Csurhes, S. (2008). Invasive plant risk assessment: Pueraria montana var. Lobata. Department of Agriculture and Fisheries Biosecurity Queensland
Mitich, L. W. (2000). Kudzu [Pueraria lobata (Willd.) Ohwi] 1. Weed Technology, 14(1), 231-235.
Oakwood, M. (2021). Kudzu Management Plan Clarence, Coffs Harbour, Bellingen sub-region. NSW North CoastWeeds Advisory Committee.
PlantNET (The NSW Plant Information Network System). Royal Botanic Gardens and Domain Trust, Sydney. Retrieved 14 January 2022 from: https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Pueraria~lobata
Queensland, Department of Agriculture and Fisheries. (2020) Restricted Invasive Plant Factsheet: Kudzu Pueraria montana var. lobata . Retrieved 14 January 2022 from: https://www.daf.qld.gov.au/__data/assets/pdf_file/0003/49665/kudzu.pdf
Turnbull, I. and Storrie, A. (2004). Kudzu: Pueraria lobata. Identification and Control. Bellingen Shire Council.
If there are just a few small plants they can be removed by hand. Dig out the tubers and make sure all parts of the plant are removed and disposed of appropriately.
Large amounts of kudzu can be composted on site if they are not in a flood zone. Piles should be checked regularly and any new growth should be treated.
Contact your local council for further advice on how to dispose of this plant.
Continual grazing can weaken and kill kudzu. Pigs can dig out and eat the tubers.
Thoroughly cover all of the foliage with the herbicide mix to the point of runoff.
For areas near waterways and native vegetation, apply herbicide to kudzu plants in full leaf, mid to late spring, followed by a second application in autumn.
In open pastures, apply a single application to kudzu plants in spring or autumn. Allow time for regrowth following grazing.
See Using herbicides for more information.
PERMIT 11604 Expires 30/09/2024
Metsulfuron-methyl 600 g/kg
(Various products)
Rate: 10 g per 100 L of water
Comments: Foliar application from spring to autumn. For further information read the permit critical use comments.
Withholding period: Nil (recommended not to graze for 7 days before treatment and for 7 days after treatment to allow adequate chemical uptake in target weeds).
Herbicide group: B, Inhibitors of acetolactate synthase (ALS inhibitors)
Resistance risk: High
PERMIT 11604 Expires 30/09/2024
Triclopyr 300 g/L + Picloram 100 g/L
(Various products)
Rate: 500 mL per 100 L of water
Comments: Foliar application from spring to autumn. For further information read the permit critical use comments.
Withholding period: Nil.
Herbicide group: I, Disruptors of plant cell growth (synthetic auxins)
Resistance risk: Moderate
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 pest 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* (for Regional Priority - Eradication)
Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found. |
Hunter |
Regional Recommended Measure* (for Regional Priority - Prevention)
Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found. |
North Coast
Exclusion (eradication) zone: Clarence Valley LGA, Port Macquarie-Hastings LGA, Lord Howe Island. Core infestation (containment) zone: Ballina Shire LGA, Bellingen Shire LGA, Byron Shire LGA, Coffs Harbour City LGA, Kempsey Shire LGA, Kyogle Shire LGA, Lismore City LGA, Nambucca Valley LGA, Richmond Valley LGA, Tweed Shire LGA. |
Regional Recommended Measure* (for Regional Priority - Containment)
Whole of region: Land managers should mitigate the risk of the plant being introduced to their land. A person should not buy, sell, move, carry or release the plant into the environment. Exclusion zone: Notify local control authority if found. Land managers should eradicate the plant from the land and keep the land free of the plant. Core infestation: Land managers should mitigate spread of the plant from their land. Land managers should reduce the impact of the plant on assets of high economic, environmental and/or social value. |
South East |
Regional Recommended Measure* (for Regional Priority - Eradication)
Land managers should mitigate the risk of the plant being introduced to their land. Land managers should eradicate the plant from the land and keep the land free of the plant. A person should not deal with the plant, where dealings include but are not limited to buying, selling, growing, moving, carrying or releasing the plant. Notify local control authority if found. |
*To see the Regional Strategic Weeds Management Plans containing demonstrated outcomes that fulfil the general biosecurity duty for this weed click here |
Reviewed 2023