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. Related. You need the Knotweed Management Company! Mature leaves are 20 - 40 cm long. It is a clone-forming perennial, growing up to 6 feet high, with reddish stems and leaf stalks. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333). 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. Appearance. 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. Himalayan Balsam. They are all large, robust perennials that spread by long creeping rhizomes to form dense thickets. Can form dense stands that outcompete native species. 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 knotweed is native to south and central Asia, including the Himalayas. Like Japanese Knotweed, it was introduced as an ornamental garden plant. How to identify Japanese knotweed.. Die back in the winter can leave areas vulnerable to erosion. The Pierce County Noxious Weed Control Board’s purpose is to educate the citizens of Pierce County, Washington, about noxious weeds and the problems they create. The flowers are white to pink, and occur in loose, branched clusters. Growth Form / Reproduction: Perennial. 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. Manual control. This plant was introduced as a garden plant in Victorian times, but is much less popular today. 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. Himalayan Balsam plants have very shallow roots, therefore, can be pulled straight from the ground. 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. They are very fast growers and can reach full height by the end of June. Himalayan knotweed is a perennial, herbaceous plant with a woody root. Polygonum polystachum CONTAIN Family: Polygonaceae (Knotweed). Himalayan Knotweed can be identified by its elongated leaves. Japanese Knotweed Management Company is a subsidary Company of Asbestos Management Company Ltd. instructions how to enable JavaScript in your web browser. 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. In Japanese knotweed, male and female flowers are on 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. It grows in both sunlight and partial shade. … 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). Like other knotweed species, it is difficult and expensive to control. All four knotweed species have similar ID characteristics and growth habits; each species is presented in detail below. If you have problems with Himalayan Balsam, Buddleia and Ragwort to name a few, Wise Knotweed Solutions is here. Displaces native species by forming dense stands up to 2m tall and reducing availability of nutrients in the soil. This means a specialist contractor should be contacted as soon as Himalayan knotweed is identified. Himalayan knotweed will grow on most soil types, but does require moisture. For a copy of the guidance to control Japanese knotweed in construction and landscape contracts contact plant.health@gov.wales. The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. 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. The objective of any Himalayan Balsam control measures and treatment plan is to prevent the plant flowering, dispensing its seeds and spreading further afield. Himalayan Balsam is an invasive plant with easily identifiable pink or white heart-shaped flowers, that was introduced to the UK in 1839. If the Himalayan Balsam is near a water-course the use of chemical control may be impossible. 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 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. Himalayan knotweed is just as capable of reducing the value of a property as Japanese knotweed. We’re also part of The LK Group of companies, providing expertise in a range of sectors within the environmental industry. 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. A detailed survey report will be provided, including options for the treatment or removal of Japanese knotweed if identified. Small areas can be hand dug, although care must be taken to remove as much as the root system as possible. 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. Legal Status: None. (Polygonum cuspidatum), giant knotweed (P. sachalinense), and Bohemian knotweed (P. x bohemicum, a hybrid species). As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed. HIMALAYAN KNOTWEED Polygonum polystachyum WHATCOM COUNTY NOXIOUS WEED PROGRAM THREAT: Himalayan knotweed is an introduced plant, native to south and central Asia, including the Himalayas. Himalayan Balsam Removal Specialists. Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species, including Himalayan balsam. Stems are solid not hollow like the other invasive knotweeds on the noxious weed list. Invasive Species Guide: Himalayan Balsam 1 | P a g e Invasive Species Guide: Japanese Knotweed Photos are sourced from GBNNSS, Trevor Renals and CABI. This highly invasive weed can grows up to 3 metres in 3 months. It has a hollow stem, similar to … This plant has been introduced to Europe, as well as the United States, and has become naturalized in areas of central Europe. Here are the The long, tapering leaves are 4 to 8 inches long, with brown, persistent sheaths at the bases of the leaf stalks. Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species, including Himalayan balsam. 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. How to control Himalayan Balsam. As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed. Thank you...one of our team members will be in touch. For any help in removing Himalayan Balsam or Japanese Knotweed, please contact Japanese Knotweed Specialists. Why Is Himalayan Knotweed A Problem? The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. Why Is Himalayan Knotweed A Problem? Download the Himalayan Balsam information sheet - PDF. Invasive Plant Solutions. Himalayan balsam can be controlled with a weedkiller based on glyphosate. 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. For more information, see Noxious Weed Lists and Laws or visit the website of the Washington State Noxious Weed Control Board. Other invasive weeds. We are The Invasive Plant Company, industry experts in the delivery of successful, cost-effective solutions for the control and eradication of Japanese Knotweed and other invasive plant species. Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. 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. How to control Himalayan Balsam. 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. Giant knotweed (figure 3) is taller than Japanese knotweed. Glyphosate is a non-selective weedkiller that is sprayed on the leaves and it is inactive on contact with the soil, so there is no risk of damage to the roots of nearby plants that you do not want to destroy. Do not ignore Japanese knotweed when you see it in your garden or building plot. Related. Under this Act, “an occupier1 must control noxious weeds growing or located on land and premises, and on any other property located on The herbicide used depends largely on the local environment and the timescale required removing the weed. Contact the professionals. Himalayan knotweed (figure 6) grows to 6 feet tall. Japanese, Sakhalin, Bohemian, and Himalayan knotweeds . Download the Japanese Knotweed information sheet - PDF Creeping rhizomes and seeds. Himalayan knotweed will grow on most soil types, but does require some moisture. knotweed control cooperative weed management area Since 2008, the Hood Canal Salmon Enhancement Group (HCSEG), in coordination with regional partners, has been working with local landowners to conduct surveys and treatment within the Hood Canal watershed for the noxious weed known as knotweed (Polygonum spp.). Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. Alternatively, you can contact the team using our contact form. Japanese, Bohemian, giant and Himalayan knotweeds are classed as noxious weeds within all regions of the province under the BC Weed Control Act, Weed Control Regulation, Schedule A, Part 1 – Provincial Weeds. [ - Japanese Knotweed Fallopia japonica Invasive Species Identification and Control Guide Species Description Japanese Knotweed is a native plant species in Japan, China and Taiwan. Stems are 2-3 m tall and are branched in the upper half. Canes are hollow and have jointed nodes. Himalayan Knotweed can be identified by its elongated leaves. For help in identifying Himalayan Balsam, you can contact Japanese Knotweed Specialist. We will survey a site and establish the best method and price for control or eradication in accordance with your requirements. instructions how to enable JavaScript in your web browser. Displaces native species by forming dense … Himalayan Knotweed. Weed Control in Natural Areas in the Western United States. Himalayan knotweed (P. polystachyum) is also present in some locations. These clumps or thickets are known as ‘stands’. Company registration number: SC1681538 Muriel Street, Barrhead, Glasgow G78 1QB. Himalayan Balsam can spread through its exploding seed pods. Harmful (injurious) weeds and invasive non-native species. Japanese knotweed. If you do notice seed pods then before you start pulling or cutting the Himalayan Balsam, simply place a plastic bag around the head of the plant and snap the head into the bag. Identify Japanese knotweed. They are very fast growers and can reach full height by the end of June. Most King County offices will be closed on December 25, for Christmas Day. Himalayan knotweed is highly invasive as it spreads vegetatively, grows quickly, shading out native species, and is a habitat generalist. (Polygonum cuspidatum), giant knotweed (P. sachalinense), and Bohemian knotweed (P. x bohemicum, a hybrid species). • Himalayan knotweed - Leaves are broadly lance-shaped with a long pointed tip. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. Himalayan Balsam control can involve the use of chemicals although there are some non-chemical control measures that can also be used. Himalayan balsam: controlling it on your land; Giant hogweed: controlling it on your land; First published 14 December 2015 Last updated 7 August 2020. 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. Mix carefully, but thoroughly between steps. These are giant knotweed (Fallopia sachalinensis), Japanese knotweed (F. japonica) and Bohemian knotweed (F. x bohemica). New shoots start to arise during the early spring. 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. Origin: Himalayas and China. Himalayan balsam: controlling it on your land; Giant hogweed: controlling it on your land; First published 14 December 2015 Last updated 7 August 2020. Margins or veins on the underside of the leaf have distinct multi-cellular hairs. It spreads by creeping underground rhizomes and by seed. 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). Eradicate Himalayan Balsam (Impatiens Glandulifera) from your land. Himalayan Balsam removal. Himalayan knotweed is native to south and central Asia, including the Himalayas. We are The Invasive Plant Company, industry experts in the delivery of successful, cost-effective solutions for the control and eradication of Japanese Knotweed and other invasive plant species. Himalayan knotweed is a perennial, herbaceous plant with a woody root. 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. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. There are traditionally two methods of dealing with Himalayan Balsam, Non-Chemical and Chemical. Therefore, to avoid making a Himalayan Balsam infestation worse, any control measures must minimise the spread of these seeds by removing mature plants. Himalayan Knotweed. Control options are intensive in terms of both labour and cost. Do not ignore Japanese knotweed when you see it in your garden or building plot. When mature and dry, these pods can explode at the slightest touch, dispensing hundreds of seeds up to 7 metres in all directions. Because control is not generally required in the county, it is on the list of Non-Regulated Noxious Weeds for King County. You must prevent Japanese knotweed on your land … Japanese, Sakhalin, Bohemian, and Himalayan knotweeds . Using herbicides is an extremely effective method to control Himalayan balsam. Flowers of all species are white, about 3 mm across, each bearing 3 to 5 petals and borne in racemes from 2 to 4 inches long that arise in the upper leaf axils. TCM Knotweed Removal Services offer a range of treatments to control, remove and eradicate Himalayan Balsam completely from your property. If you've ever wandered along a riverbank, pond or lake, we guarantee you will have seen it at least once! Himalayan Knotweed (Persicaria wallichii) This Asian herbaceous perennial shrub is another member of the Polygonaceae family which is often mistaken for Japanese Knotweed. Himalayan Knotweed (Persicaria Wallichii) is a robust rhizomatous perennial that can grow to 1.8 metres and produces loosely clustered pinkish or white flowers in late summer into early autumn.Again, like the other Knotweeds this was introduced as an ornamental and has become very persistent in abandoned gardens and on roadsides or where there is garden waste. 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. Each year after that you must map the affected area following control work, each year. They hybridize to produce Bohemian knotweed. Flowers of all species are white, about 3 mm across, each bearing 3 to 5 petals and borne in racemes from 2 to 4 inches long that arise in the upper leaf axils. 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). 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. Seed pods are formed after flowering which explode with thousands of seeds being jettisoned from the pods and attaching themselves to birds and mammals to be transported to colonise new ground. Himalayan Balsam should be cut below the lowest node otherwise is will just re-grow again. Himalayan knotweed is a Class B Noxious Weed in Washington, first listed in 2003. Despite its attractive appearance, Himalayan Balsam is, just like Japanese Knotweed, considered a problem weed. Smaller infestation of Himalayan Balsam can be controlled by hand-pulling. 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. These are giant knotweed (Fallopia sachalinensis), Japanese knotweed (F. japonica) and Bohemian knotweed (F. x bohemica). It forms dense clumps which can be up to three metres in height. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Prevent spread of Japanese knotweed. Himalayan Balsam is naturally found in Asia in the mountains of the Himalayas and bought back to the UK by the Victorians. Fast professional service with fully qualified staff for any job, large or small. Stems are 2-3 m tall and are branched in the upper half. MANAGEMENT OPTIONS: Management options are not well known for Himalayan knotweed. Contact the professionals. Can form dense stands that outcompete native species.Die back in the winter can leave areas vulnerable to erosion. Himalayan knotweed is on the Washington quarantine list (known as the prohibited plants list) and it is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts, seeds in packets, blends or "wildflower mixes" of this species, into or within the state of Washington. Download the Giant Hogweed information sheet - PDF. This highly invasive weed can grows up to 3 metres in 3 months. Other Common Names: None. Description Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. Of course, with Himalayan balsam growing incredibly tall and in difficult to reach places, this method can be time-consuming and often ineffective. The Stationhouse, Station Road, Dundrum, Co. Tipperary, Ireland. Himalayan knotweed Treatment. It can cause declines in native plants, including rare or localised species, due to their quick growth and shading out other plants. 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