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VERIFIED PLANT GUIDE

Japanese Knotweed

Reynoutria japonica

A vigorous perennial with bamboo-like stems, broad leaves and clusters of small pale flowers.

FamilyPolygonaceaePhoto matchUse as a starting point
Japanese knotweed stems and broad leaves growing in a thicketReynoutria japonica

Photo: Abraham · CC BY-SA 4.0

IDENTIFICATION CLUES

What to check in your photo

  • Hollow, jointed stems with purple flecks
  • Broad leaves with a squared or flat base
  • Creamy flower sprays in late summer

CARE AND NEXT STEPS

Useful context after identification

  • Treat suspected infestations as a local invasive-plant question
  • Avoid cutting or moving fragments without guidance
  • Use local extension or conservation advice for control
Safety note

A photo match is not enough to choose a treatment or disposal method. Follow local invasive-species rules before disturbing this plant.

COMPARE

Similar plants

giant knotweedbohemian knotweed

CHECK YOUR PHOTO

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Try a close-up of the leaf, flower, fruit or bark. The result is more useful when you include the whole plant and one detail view.

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