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Himalayan Knotweed www.smartknotweed.co.uk Himalayan Knotweed (Persicaria wallichii) This Asian herbaceous perennial shrub is another member of the Polygonaceae family which is often mistaken for Japanese Knotweed. Stems of Japanese and Bohemian knotweed tend to be spotted with reddish-purple. Pure strains of Japanese, giant, or Himalayan knotweed are thought not to produce viable seed while hybrid varieties can produce viable seeds (Soll 2004). Japanese knotweed (Polygonum cuspidatum) The most ornamental of the knotweeds and shorter than Bohemian or giant. Himalayan Balsam can tolerate low light levels and due to the extent of the growth, it creates a pseudo woodland meaning that any other plants growing within close proximity are shadowed, therefore inhibiting their growth. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. This particular member of the Polygonaceae family is often mistaken for Japanese Knotweed, which is why experience, expert analysis and identification is necessary in order to carry out the proper and most effective treatments and control measures. Hybrid between giant and Japanese knotweed and shares characters of both parent species. Send us a photo and we will provide you with a no-obligation analysis, so you can be sure what your weedy worry is. Himalayan Knotweed (Persicaria wallichii) is not closely related to Giant Knotweed, Japanese Knotweed and their hybrids.It is a herbaceous perennial and is invasive though not so invasive as the notorious Japanese Knotweed. Bohemian knotweed (Polygonum x bohemicum) The most common invasive knotweed in western Washington. This is another member of the Polygonaceae family which is often mistaken for Japanese Knotweed. It flowers in mid to late summer; however, the flowers are large and pink, whereas the flowers on Japanese Knotweed … Why Is Himalayan Knotweed A Problem? ‘compacta’, which can also be referred to as Reynoutria compacta) and Himalayan knotweed (Persicaria wallichii). It also has a hollow stem like Japanese Knotweed does. Himalayan Balsam removal. Himalayan Knotweed. Their rhizome (root) can grow through concrete, drains, and bricks and mortar. They superficially resemble bamboo, with enlarged nodes. Often confused with Japanese knotweed. Japanese vs Bohemian knotweed. Displaces native species by forming dense stands up to 2m tall and reducing availability of nutrients in the soil. Other forms of knotweed that are found in some areas of the UK include a dwarf variety (Fallopia japonica var. For any help in removing Himalayan Balsam or Japanese Knotweed, please contact Japanese Knotweed Specialists. Himalayan Knotweed can be identified by its elongated leaves. Japanese and Bohemian knotweed share many similarities. Can reduce the quality of fish and wildlife habitat in riparian areas. Himalayan Balsam can easily be misidentified as Japanese Knotweed due to the rate at which it grows at and also how tall it can become. As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed. Invasive plants: Giant Hogweed vs Japanese Knotweed 3rd November 2015; How to identify Japanese Knotweed: through the seasons 25th September 2015; How Japanese Knotweed could choke your mortgage 21st April 2015; Failure to control Japanese Knotweed could give you a criminal record 20th March 2015; Japanese Knotweed – UK tries to stem spread of nuisance weed 12th … For help in identifying Himalayan Balsam, you can contact Japanese Knotweed Specialist. But here is how they differ: Bohemian leaves are bigger than those of Japanese knotweed; Flower are green/white; Bohemian knotweed can spread much quicker and over a larger area. Die back in the winter can leave areas vulnerable to erosion. Latest Posts. Sakhalin knotweed stems may be as much as 2 inches thick at the base, with Bohemian, Japanese, and Himalayan knotweed stems progressively thinner to about 0.5 inch thick. Can form dense stands that outcompete native species. Japanese knotweed can also reproduce vegetatively from thick rhizomes that can reach 40 to 60 feet in length and annual growth of 8 …

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