What is Japanese Knotweed


What is Japanese Knotweed?

Japanese knotweed (Fallopia Japonica) is one of a number of invasive plants that can cause problems to your property.

● It’s a large clump-forming plant, which grows up to 3m tall, with light green shield-shaped leaves with a flattened base, approximately 10-15cm long.

● The stem is hollow, bamboo-like, light green speckled with pink-red.

● There are only female plants in Britain, so no viable seeds are produced.

● The flowers are tiny and clustered together in creamy-white sprays, present from August to October.

● It produces thick and extensive roots called rhizomes, orangey-yellow inside, and spreads by fragments of rhizome. A piece the size of your thumbnail is sufficient. Fragments of rhizome get picked up in soil and on equipment and spread easily.

● Over the winter the plant dies back leaving tall brown canes but as a perennial plant its top growth is renewed each year from the rhizomes which can spread relentlessly.

What is Japanese knotweed?


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