NS3878 : Himalayan Knotweed

taken 5 years ago, near to Renton, West Dunbartonshire, Great Britain

Himalayan Knotweed
Himalayan Knotweed
(Persicaria wallichii)

At the time of writing, this species is not particularly common. However, a similar large patch could be seen alongside some parts of NS3781 : Upper Stoneymollan Road (as shown in that picture); the one in the present picture is in Renton Wood.

The common name accurately describes where this species originates. It has become naturalised in various locations scattered throughout Britain and Ireland. Some authorities consider it invasive, and a problem plant, because it establishes dense stands that crowd out native species. Its common name, Himalayan Knotweed, shares elements with two other much more abundant species that are likewise considered invasive: Japanese Knotweed, which belongs to the same plant family; and Himalayan Balsam, which does not (and which is also known as Indian Balsam).

[When I first came across this large patch, several years ago, I found that, in the popular guide I was then using, the plants keyed out, correctly, as belonging to the Docks and Bistorts Family, but that they didn't match any species listed in the book. My thanks to fellow contributor Stan Campbell, who identified them correctly.]
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NS3878, 264 images   (more nearby )
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Date Taken
Wednesday, 10 September, 2014   (more nearby)
Saturday, 20 September, 2014
Geographical Context
Woodland, Forest 
Image Buckets ?
Place (from Tags)
Renton Wood 
Primary Subject of Photo
Subject Location
OSGB36: geotagged! NS 3852 7821 [10m precision]
WGS84: 55:58.1791N 4:35.3375W
Camera Location
OSGB36: geotagged! NS 3852 7821
View Direction
West-southwest (about 247 degrees)
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