In Washington State, “noxious weed” is a legally defined term. This plant is similar to Japanese knotweed, but has longer, pointed leaves. To education the public about the law requiring landowners to control and to prevent the spread of noxious weeds from their property. Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species, including Himalayan balsam. Himalayan knotweed will grow on most soil types, but does require some moisture. The herbicide used depends largely on the local environment and the timescale required removing the weed. Appearance. Himalayan Balsam is an invasive plant with easily identifiable pink or white heart-shaped flowers, that was introduced to the UK in 1839. How to control Himalayan Balsam. This means a specialist contractor should be contacted as soon as Himalayan knotweed is identified. All four knotweed species have similar ID characteristics and growth habits; each species is presented in detail below. For help in identifying Himalayan Balsam, you can contact Japanese Knotweed Specialist. Japanese Knotweed Management Company is a subsidary Company of Asbestos Management Company Ltd. Furthermore, using herbicides in or near canals, rivers or drainage channels within the country may require prior agreement from the Scottish Environmental Protection Agency (SEPA). Invasive Species Guide: Himalayan Balsam 1 | P a g e Invasive Species Guide: Japanese Knotweed Photos are sourced from GBNNSS, Trevor Renals and CABI. We will survey a site and establish the best method and price for control or eradication in accordance with your requirements. The Stationhouse, Station Road, Dundrum, Co. Tipperary, Ireland.  All species were introduced into the U.S. and Canada starting in the late 1800s as ornamental plants and for erosion control and have since spreadwidely. How to control Himalayan Balsam. It tends to grow in dense, mounded clumps. For more information, see Noxious Weed Lists and Laws. Under this Act, “an occupier1 must control noxious weeds growing or located on land and premises, and on any other property located on Stems are 2-3 m tall and are branched in the upper half. Growth Form / Reproduction: Perennial. It has a hollow stem, similar to … Japanese Knotweed Specialists are renowned within the industry as one of the UK’s leading contractors in the removal, treatment and control of Japanese Knotweed. This plant was introduced as a garden plant in Victorian times, but is much less popular today. Himalayan Balsam can spread through its exploding seed pods. Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. [ - Japanese Knotweed Fallopia japonica Invasive Species Identification and Control Guide Species Description Japanese Knotweed is a native plant species in Japan, China and Taiwan. Himalayan balsam (Impatiens glandulifera) is a relative of the busy Lizzie, but it reaches well over 6 foot, it is an invasive plant and is a major problem, particularly on riverbanks and waste land, but can also intrude gardens. It has not been designated for required control in the county by the Washington State Noxious Weed Control Board, but it has been selected for required control in limited parts of the county by the King County Noxious Weed Control Board. Himalayan balsam can be controlled with a weedkiller based on glyphosate. They are all large, robust perennials that spread by long creeping rhizomes to form dense thickets. Conservation authorities sometimes partake in “Balsam bashing” parties, but these must be undertaken with extreme caution, as studies have shown that this can actually help the plant to spread. It can cause declines in native plants, including rare or localised species, due to their quick growth and shading out other plants. It is not as common as other invasive knotweeds in King County, but where it occurs it creates dense growth that excludes other vegetation and can impact riparian habitat. Do not ignore Japanese knotweed when you see it in your garden or building plot. We are an environmental company specialising in all types of land remediation, based in Co Kerry and we cover the whole of Ireland with our services. The Council will tackle the following invasive non-native species on Council owned land. • Giant knotweed - Leaves are deeply curved and heart shaped base (cordate). Himalayan Balsam should be cut below the lowest node otherwise is will just re-grow again. instructions how to enable JavaScript in your web browser. The Japanese Knotweed Company is Ireland’s leading Knotweed control company, we specialise in the treatment, control and eradication of Japanese Knotweed throughout the island of Ireland. The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. Himalayan knotweed (P. polystachyum) is also present in some locations. Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has characteristics of both parents. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333). Himalayan knotweed will grow on most soil types, but does require moisture. Japanese, Sakhalin, Bohemian, and Himalayan knotweeds . Each year after that you must map the affected area following control work, each year. Himalayan knotweed (P. polystachyum) is also present in some locations. It forms dense clumps which can be up to three metres in height. This plant has been introduced to Europe, as well as the United States, and has become naturalized in areas of central Europe. We are pleased to offer our Japanese Knotweed solutions and other invasive weed removals nationwide to … These clumps or thickets are known as ‘stands’. If the Himalayan Balsam is near a water-course the use of chemical control may be impossible. Japanese knotweed. Himalayan knotweed is a perennial, herbaceous plant with a woody root. Invasive Plant Solutions. The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. Himalayan knotweed is just as capable of reducing the value of a property as Japanese knotweed. If you are undertaking Japanese knotweed, Giant hogweed or Himalayan balsam control with your application, you must submit a 1:10 000 OS map identifying the current distribution of plant species that you propose to treat before control work starts. If you want to try and control the Himalayan balsam yourself you can try cutting the plant back or pulling it up before it has a chance to seed. Himalayan Knotweed can be identified by its elongated leaves. Leaves can be up to 2.5 feet long, and flowers are greenish-white. Control options are intensive in terms of both labour and cost. They are very fast growers and can reach full height by the end of June. Invasive, non-native weed specialists with over 24 years experience in management, control and removal of Japanese Knotweed, Giant Hogweed, Himalayan Balsam and other invasive plants in Ireland. Harmful (injurious) weeds and invasive non-native species. Himalayan Knotweed. April and May are regarded as the optimum time to treat Himalayan Balsam. Himalayan balsam: controlling it on your land; Giant hogweed: controlling it on your land; First published 14 December 2015 Last updated 7 August 2020. Here are the Therefore, to avoid making a Himalayan Balsam infestation worse, any control measures must minimise the spread of these seeds by removing mature plants. Despite its attractive appearance, Himalayan Balsam is, just like Japanese Knotweed, considered a problem weed. Established in 2014 and based in Coleraine, the Knotweed Management Company provides proven solutions to remove and treat the triple threat of Japanese Knotweed, Himalayan Balsam, and Giant Hogweed. Himalayan Balsam Removal Specialists. Other Common Names: None. Can form dense stands that outcompete native species.Die back in the winter can leave areas vulnerable to erosion. New shoots start to arise during the early spring. Knotweeds Four knotweed species are currently found in British Columbia: Japanese knotweed (Fallopia japonica), Giant knotweed (Fallopia sachalinensis), Bohemian knotweed (Fallopia x bohemica), and Himalayan knotweed (Polygonum polystachyum). In the Pacific Northwest, there are four similar species of invasive knotweed that are difficult to tell apart and share similar habitat, impacts and control methods. You must prevent Japanese knotweed on your land … Himalayan knotweed is a perennial, herbaceous plant with a woody root. We’re also part of The LK Group of companies, providing expertise in a range of sectors within the environmental industry. Bohemian knotweed. In Japanese knotweed, male and female flowers are on For maximum effectiveness, the measures detailed further down this page should be carried out before June, which is the start of the flowering stage and before the seed pods are visible. Smaller infestation of Himalayan Balsam can be controlled by hand-pulling. The long, tapering leaves are 4 to 8 inches long, with brown, persistent sheaths at the bases of the leaf stalks. Worth noting is that Bohemian Knotweed (Fallopia x bohemica) is the result of natural hybridization between Japanese and Giant Knotweeds (R. japonica and F. sachalinensis), whereas Himalayan Knotweed is a different genus altogether (Persicaria wallichii). 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. Why Is Himalayan Knotweed A Problem? Manual control. New shoots start to arise during the early spring. This highly invasive weed can grows up to 3 metres in 3 months. instructions how to enable JavaScript in your web browser. Members of the Invasive Weed Control section of the PCA are qualified and regulated in Japanese Knotweed management and can deliver efficient, effective and reliable treatment. It grows in both sunlight and partial shade. Like Japanese Knotweed, it was introduced as an ornamental garden plant. Legal Status: None. Like other knotweed species, it is difficult and expensive to control. Himalayan balsam. Japanese Knotweed Survey: Phlorum can provide a comprehensive survey to establish whether Japanese knotweed is present within your property. Giant knotweed (figure 3) is taller than Japanese knotweed. As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed. Himalayan Knotweed (Persicaria wallichii) This Asian herbaceous perennial shrub is another member of the Polygonaceae family which is often mistaken for Japanese Knotweed. If you've ever wandered along a riverbank, pond or lake, we guarantee you will have seen it at least once! It can grow quickly and costs will grow as the plant does. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. For full functionality of this site it is necessary to enable JavaScript. Send us a photo and we will provide you with a no-obligation analysis, so you can be sure what your weedy worry is. Die back in the winter can leave areas vulnerable to erosion. 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. Originating in the Indian Subcontinent, Himalayan Knotweed was first cultivated in the UK in the early 1900’s and first recorded in the wild in North Devon in 1917. Himalayan knotweed is highly invasive as it spreads vegetatively, grows quickly, shading out native species, and is a habitat generalist. When mature and dry, these pods can explode at the slightest touch, dispensing hundreds of seeds up to 7 metres in all directions. Using herbicides is an extremely effective method to control Himalayan balsam. Stems are 2-3 m tall and are branched in the upper half. Because control is not generally required in the county, it is on the list of Non-Regulated Noxious Weeds for King County. Himalayan knotweed Treatment. A standard mixing sequence for most herbicides that would be used in knotweed control would be to add half the total amount of water to your spray tank, add the measured amount of herbicide, any surfactant (and dye), then the rest of the water. Contact US ABOUT HIMALAYAN BALSAM control. Creeping rhizomes and seeds. Canes are hollow and have jointed nodes. It grows in both sunlight and partial shade. TCM Knotweed Removal Services offer a range of treatments to control, remove and eradicate Himalayan Balsam completely from your property. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. Margins or veins on the underside of the leaf have distinct multi-cellular hairs. Weed Control in Natural Areas in the Western United States. Stems are solid not hollow like the other invasive knotweeds on the noxious weed list. Contact the professionals. They hybridize to produce Bohemian knotweed. A detailed survey report will be provided, including options for the treatment or removal of Japanese knotweed if identified. Each year after that you must map the affected area following control work, each year. In Japanese knotweed, male and female flowers are on Mature leaves are 20 - 40 cm long. If you are undertaking Japanese knotweed, Giant hogweed or Himalayan balsam control with your application, you must submit a 1:10 000 OS map identifying the current distribution of plant species that you propose to treat before control work starts. Japanese knotweed can be mistakenly identified as other similar plants, such as Russian vine or Himalayan Honeysuckle, but it can cause a lot more damage than these plants. Whether you are a land manager dealing with a large Himalayan Balsam infestation or a property owner with a couple plants in the garden it is crucial not to allow the seeds to spread. We will survey a site and establish the best method and price for control or eradication in … There are traditionally two methods of dealing with Himalayan Balsam, Non-Chemical and Chemical. Himalayan Balsam; Giant Hogweed; Japanese Knotweed. Himalayan Knotweed can be identified by its elongated leaves. For any help in removing Himalayan Balsam or Japanese Knotweed, please contact Japanese Knotweed Specialists. They are very fast growers and can reach full height by the end of June. Download the Giant Hogweed information sheet - PDF. These tall, bamboo-like plants were introduced from Asia as ornamentals beginning in the early 1800's in England and in the United States by 1890. Due to its size, growth rate and ability to thrive even in low light conditions, it often shadows other plants, starving them of light and eventually completely outgrowing them. Of course, with Himalayan balsam growing incredibly tall and in difficult to reach places, this method can be time-consuming and often ineffective. Small areas can be hand dug, although care must be taken to remove as much as the root system as possible. Although padded gloves are recommended at all times to avoid the risk of injury. Prevent spread of Japanese knotweed. If you have a Himalayan Balsam problem and want to talk to the invasive weeds experts at Wise knotweed Solutions then call 0808 231 9218 or find your local branch. Public and private landowners are not generally required to control infestations of Himalayan knotweed that occur on their property in King County, Washington, except in selected areas on the Green River and its tributaries and on the Cedar River and its tributaries, as described on the King County Weed List. Knotweeds have often been transplanted during various types of earth movements but at Otterhead are among the surviving ornamental plants in the lost gardens of … You need the Knotweed Management Company! Himalayan Balsam is naturally found in Asia in the mountains of the Himalayas and bought back to the UK by the Victorians. For a copy of the guidance to control Japanese knotweed in construction and landscape contracts contact plant.health@gov.wales. Price for control or eradication in accordance with your requirements how to JavaScript. Of Himalayan Balsam ( Impatiens Glandulifera ) from your property of service apply area following control work each. 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