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Himalayan Knotweed, Persicaria wallichii


Short description of Persicaria wallichii, Himalayan Knotweed

A robust rhizomatous perennial to 1.8m, with pinkish or white flowers. The leaves are lanceolate, up to 20cm long, and with sheaths surrounding the stem at the base of their stalks as in other knotweeds.

Description of Persicaria wallichii, Himalayan Knotweed status in GB

Himalayan knotweed is a garden escape naturalised on roadsides, especially in north and west GB and Northern Ireland.

Habitat summary: Persicaria wallichii, Himalayan Knotweed

Damp grassland and streamsides.

Overview table

Environment: Terrestrial
Species status: Non-Native
Native range: Himalayas
Functional type: Land plant
Status in England: Non-Native
Status in Scotland: Non-Native
Status in Wales: Non-Native
Location of first record: v.c.54
Date of first record: 1917

Distribution map

Map of the UK with areas shaded to show the UK distribution of Himalayan Knotweed

GB Distribution from NBN Atlas

Author's name:

Jeremy Ison

Last updated:

October 4th 2019

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Thin strip of image show tree trunk and bark