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Japanese Knotweed Identification

Our team of Japanese Knotweed specialists can help you identify if you have a Knotweed problem.

Japanese Knotweed is one of the most invasive plant species in the UK and has many guises, depending on the time of the year. Identifying it is not always easy, even if you know what to look for.  While an Agronomist will know the differences between Knotweed and commonly misidentified plants, these may not be so obvious to a less experienced person. Below are some images and descriptions of the main features of Japanese Knotweed that should help you identify it, but should you remain unsure Landtech (UK) Limited can help with our FREE Japanese Knotweed Identification Service.

Heart shaped leaves & white flowers

Bamboo like stems with 'nodes'

New shoots in an established stand

  • The leaves are light green and heart shaped.
  • In late August the plant produces small cream sterile flowers.
  • Around the end of October plants start to die back for the winter.
  • Dead brown canes are the only above ground sign of Knotweed during the winter.
  • New shoots emerge every March.
  • Shoots can resemble asparagus on emergence.
  • Plants can reach 2 metres by the end of May.
  • By the end of June plants can be 3-4m tall, and are identifiable by their bamboo like nature and fleshy green/red tinged colour.

Very new shoots tinged red

Dead canes

Asparagus like appearance

The rhizome is the underground part of the plant.  Rhizomes have a twig-like appearance with a dark brown exterior. The texture of the outer bark is leathery with nodes at 1-2cm spacing, slightly enlarged and ‘knotty’.

When the bark is removed, the tissue is pale orange/yellow. They are brittle when fresh and break easily like a carrot. Young rhizomes are white and very soft.

Japanese Knotweed Identifcation Service

Landtech (UK) Limited provide a FREE Japanese Knotweed identification service, where we review photos of your suspected Knotweed plant. If you would like us to identify your plant, click the button below to email us your photos and we will respond as soon as possible.

If you would like further information about our Japanese Knotweed identification service, or if would like to request a FREE survey or quote, ask a question or discuss your requirements in detail, then please do not hesitate to contact us today. Call us on 01299 405353 or email