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Japanese Knotweed Photos

How to identify Japanese Knotweed

If you are involved in site acquisition, development or landscape works you ought to be able to correctly identify whether Japanese knotweed is present on your site. Please hover over the images below or click on a photo to view in full size.

  • Japanese Knotweed shoots appear in early springshoots appear in early spring, with a characteristic red hue which changes to green Japanese Knotweed will grow through tarmac and drainsWill grow through tarmac and drains Rapid Japanese Knotweed growthRapid growth with characteristic pointed leaf around April/May It could be at your door!It could be at your door! Dense Japanese Knotweed growthDense growth with new canes reaching 2-3m in height by July/August Japanese KnotweedJapanese Knotweed onset of Autumn turns Japanese Knotweed leaves orangeonset of Autumn turns leaves orange large crowns are the source of the plants energylarge crowns are the source of the plants energy After Autumn frost leaves, turn yellow and fallAfter Autumn frost, leaves turn yellow and fall Japanese Knotweed Rhizomes are distinct in appearanceRhizomes are distinct in appearance Dead Japanese Knotweed canes during winterDead canes during winter outcompetes native speciesoutcompetes native species Small white flowers are produced during late summerSmall white flowers are produced during late summer Transport corridors are susceptible to further spreadTransport corridors are susceptible to further spread exceptionally fast growingexceptionally fast growing Will grow almost anywhereWill grow almost anywhere Japanese Knotweed Can cause unwanted property damageCan cause unwanted property damage New shoots can sometimes be mistaken as BrambleNew shoots can sometimes be mistaken as Bramble Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed Japanese Knotweed

Useful Links

Environet on BBC One Show

Managing Japanese Knotweed on Development Sites – Code of Practice published by Environment Agency (5.5MB)

Japanese Knotweed – A Guide for Landowners and Developers published by Environet

Knotweed online Survey Form Fill out your details and we will send a quote

Japanese Knotweed – A Legal Perspective by Robert Twining, Warners Solicitors

Xtract Method Info published by Environet

knotweed leaf

Xtract™ - on site remediation for rapid guaranteed eradication of Japanese knotweed. More info


herbicide method

Herbicide treatment for the eradication or control of Japanese Knotweed. Suitable for commerical, residential and development sites. More info