Japanese walnut (Juglans ailantifolia)



Japanese walnut is an environmental weed that invades forests especially along the edges of waterways. It is long-lived and limits the growth of native plants under its wide canopy.


Japanese walnut is a deciduous tree up to 15 m high with wide spreading foliage and clusters of hairy fruit that contain hard-shelled nuts. Japanese walnut looks very similar to black walnut (Juglans nigra), and there are infestations in NSW that are yet to be identified as either plant.


PlantNET (2017). Royal Botanic Gardens and Domain Trust, Sydney. plantnet.rbgsyd.nsw.gov.au 

Weedbusters New Zealand (2017) Weed Information Sheet Japanese Walnut Juglans ailantifolia

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Herbicide options

Contact your local council weeds officer for control advice for Japanese walnut (Juglans ailantifolia).

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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.
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