Japanese Knotweed ID – Autumn

Knotweed ID AutumnKey features:

  • Mature clumps 2-3 metres high, with dense stands of yellowing bamboo-like stems up to 20-25mm diameter which gradually turn brown and dry as colder weather sets in.
  • Distinctive masses of bare flowering spikes in clusters from nodes towards the ends of branching zig-zag stems.
  • Where leaves are still present, a single shield-shaped leaf 10-12cm long with a flat base from each node.

Similar non-invasive species:

  • Hazel – looks very similar in autumn at first glance but leaves are much more heavily veined and ribbed, stems are straight rather than zig-zag, and have no flower spike remnants at ends.

More information:


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