How to identify Japanese knotweed

identify Japanese knotweed

Spring

March – April
Shoots and stems are a purple/red colour with curled pinky reddish leaves.​ As the canes grow the leaves gradually unfurl and turn green.


identify Japanese knotweed

Summer

May – August
Shoots and stems are green with purple speckles. Leaves become heart shaped and turn green.


identify Japanese knotweed

Autumn

September – October
Stems are virilant, growing upwards of up to six feet, cream/white flowers appear late summer/autumn.


identify Japanese knotweed

Winter

November – February
Stems change to dark brown and are hollow, brittle and absent of leaves or flowers.

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