Once you know how to identify Japanese Knotweed you will be spotting it all over the place due to the huge spread throughout the UK. If you’ve no idea what to look for, or found a plant which you believe is knotweed but are not sure, or even just looking for a quick reminder we’ve listed below what you should look out for.
Starts out as a reddish/purple shoot
Raised nodes along the hollow stem resemble that of bamboo
As the plant matures the stem becomes green with numerous small reddish/purple specks
The broad, heart shaped/oval leaves emerge in a zig-zag formation
The off-white flowers grow in clusters of small spiky stems covered with tiny flowers
At the base of the stems is a knotty lumpy section called the crown, this is commonly covered with fine brown tendrils
The rhizome, buried underground has a woody, knotty appearance and is brown in colour.
Scraping back the relatively thin brown outer layers or snapping the rhizome reveals a yellow/orange inner core.
As knotweed reaches the end of its yearly life cycle, the flowers and leaves drop and the stem dies back to a brown cane.
Everything you wanted to know about Japanese Knotweed but were afraid to ask
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