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Himalayan knotweed

(Persicaria wallichii )

Himalayan knotweed © Crown Copyright 2009. GBNNSS

Himalayan knotweed © Crown Copyright 2009. GBNNSS


A non-native invasive plant.

This plant is similar to Japanese knotweed, but has longer, pointed leaves. It’s a large, thicket-forming plant, reaching up to 2m tall, and has become established on stream sides, hedge banks, woodland edges, roadsides, railway banks and waste ground.

This plant was introduced as a garden plant in Victorian times, but is much less popular today. It is still present in some gardens and is still available commercially from some nurseries.

Habitat

As with similar plants (like Japanese knotweed), Himalayan knotweed grows on stream sides, hedge banks, woodland edges, roadsides, railway banks and waste ground.

What's the problem?

Once established this plant grows into extremely dense stands that out-compete all native vegetation.

Rapid Risk Assessment

***** Critical Risk

Plantlife's position

This is a species that Plantlife believes should be listed on Schedule 9 of the Wildlife and Countryside Act in England and Wales.