They are very fast growers and can reach full height by the end of June. For a copy of the guidance to control Japanese knotweed in construction and landscape contracts contact plant.health@gov.wales. It grows in both sunlight and partial shade. Each year after that you must map the affected area following control work, each year. Like other knotweed species, it is difficult and expensive to control. For help in identifying Himalayan Balsam, you can contact Japanese Knotweed Specialist. instructions how to enable JavaScript in your web browser. 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. Himalayan knotweed is a Class B Noxious Weed in Washington, first listed in 2003. Himalayan knotweed (P. polystachyum) is also present in some locations. Company registration number: SC1681538 Muriel Street, Barrhead, Glasgow G78 1QB. This plant has been introduced to Europe, as well as the United States, and has become naturalized in areas of central Europe. 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). Contact the professionals. An effective Himalayan Balsam control measure for larger strands of the plant is to repeatedly cut or mow the plant. Like Japanese Knotweed, it was introduced as an ornamental garden plant. It spreads by creeping underground rhizomes and by seed. (Polygonum cuspidatum), giant knotweed (P. sachalinense), and Bohemian knotweed (P. x bohemicum, a hybrid species). New shoots start to arise during the early spring. Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species, including Himalayan balsam. It has a hollow stem, similar to … Himalayan balsam can be controlled with a weedkiller based on glyphosate. The long, tapering leaves are 4 to 8 inches long, with brown, persistent sheaths at the bases of the leaf stalks. A detailed survey report will be provided, including options for the treatment or removal of Japanese knotweed if identified. Smaller infestation of Himalayan Balsam can be controlled by hand-pulling. 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). Himalayan knotweed is a perennial, herbaceous plant with a woody root. Can form dense stands that outcompete native species. First introduced to the UK in 1839, its rapid growth and attractive flower made it a favourite with gardeners and the seeds were happily shared and traded. 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. Description Harmful (injurious) weeds and invasive non-native species. Himalayan Knotweed. We will survey a site and establish the best method and price for control or eradication in … 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. Eradicate Himalayan Balsam (Impatiens Glandulifera) from your land. Himalayan knotweed (Persicaria wallichii) is an aggressive competitor in the Buckwheat Family that was introduced from Asia as an ornamental. Origin: Himalayas and China. 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. Appearance. 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. To education the public about the law requiring landowners to control and to prevent the spread of noxious weeds from their property. They are very fast growers and can reach full height by the end of June. MANAGEMENT OPTIONS: Management options are not well known for Himalayan knotweed. 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. Giant knotweed (figure 3) is taller than Japanese knotweed. It grows in both sunlight and partial shade. 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. 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. Although padded gloves are recommended at all times to avoid the risk of injury. Himalayan Balsam should be cut below the lowest node otherwise is will just re-grow again. New shoots start to arise during the early spring. Harmful (injurious) weeds and invasive non-native species. Download the Giant Hogweed information sheet - PDF. If you spot Japanese knotweed, we recommend leaving it undisturbed, and getting in touch with us to confirm your diagnosis and make a start on the removal and management process. Himalayan knotweed will grow on most soil types, but does require some moisture. 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. Thank you...one of our team members will be in touch. Himalayan Balsam should be cut below the lowest node otherwise is will just re-grow again. • Himalayan knotweed - Leaves are broadly lance-shaped with a long pointed tip. 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. Japanese Knotweed Survey: Phlorum can provide a comprehensive survey to establish whether Japanese knotweed is present within your property. Himalayan knotweed Treatment. Do not ignore Japanese knotweed when you see it in your garden or building plot. 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. Bohemian knotweed. April and May are regarded as the optimum time to treat 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. Prevent spread of Japanese knotweed. Download the Japanese Knotweed information sheet - PDF Contact the professionals. They are all large, robust perennials that spread by long creeping rhizomes to form dense thickets. Therefore, to avoid making a Himalayan Balsam infestation worse, any control measures must minimise the spread of these seeds by removing mature plants. The Council will tackle the following invasive non-native species on Council owned land. Himalayan knotweed is a Class B Noxious Weed in Washington, first listed in 2003. As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed. Displaces native species by forming dense stands up to 2m tall and reducing availability of nutrients in the soil. They can grow up to 20 cm long and are about ½ as broad. Related. Himalayan Balsam; Giant Hogweed; Japanese Knotweed. Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. … 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. Invasive Plant Solutions. Himalayan knotweed (P. polystachyum) is also present in some locations. In Japanese knotweed, male and female flowers are on Himalayan knotweed will grow on most soil types, but does require moisture. Identify Japanese knotweed. 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. 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. Creeping rhizomes and seeds. instructions how to enable JavaScript in your web browser. Canes are hollow and have jointed nodes. Herbicide, excavation and root barriers … We’re also part of The LK Group of companies, providing expertise in a range of sectors within the environmental industry. Himalayan Balsam is an invasive plant with easily identifiable pink or white heart-shaped flowers, that was introduced to the UK in 1839. 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. The good news is that Himalayan knotweed is just as treatable as Japanese knotweed and the same techniques can be used. 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. It is a clone-forming perennial, growing up to 6 feet high, with reddish stems and leaf stalks. 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. Stems are 2-3 m tall and are branched in the upper half. An effective Himalayan Balsam control measure for larger strands of the plant is to repeatedly cut or mow the plant. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333). The flowers are white to pink, and occur in loose, branched clusters. Himalayan Balsam plants have very shallow roots, therefore, can be pulled straight from the ground. 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.). Become a certified small business contractor or supplier, Find certified small business contractors and suppliers, Washington State Noxious Weed Control Board, Invasive Knotweed Best Management Practices. Despite its attractive appearance, Himalayan Balsam is, just like Japanese Knotweed, considered a problem weed. This highly invasive weed can grows up to 3 metres in 3 months. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. Himalayan Balsam is naturally found in Asia in the mountains of the Himalayas and bought back to the UK by the Victorians. When mature and dry, these pods can explode at the slightest touch, dispensing hundreds of seeds up to 7 metres in all directions. 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). Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. 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. Because control is not generally required in the county, it is on the list of Non-Regulated Noxious Weeds for King County. Can form dense stands that outcompete native species.Die back in the winter can leave areas vulnerable to erosion. How to control Himalayan Balsam. Himalayan balsam.  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. Do not ignore Japanese knotweed when you see it in your garden or building plot. Here are the Fax 062-71589 | Mobile 086-2621443 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. Eradicate Himalayan Balsam (Impatiens Glandulifera) from your land. This means a specialist contractor should be contacted as soon as Himalayan knotweed is identified. Pulling or cutting Himalayan Balsam plants before they flower and set seed is the main form of manual Himalayan Balsam removal. The creeping rhizomes must be completely removed from a site, which means sifting soil to capture rhizome pieces as small as 2 cm.2 Habitat: Himalayan knotweed can grow in loamy, silty, or sandy soils and can tolerate a pH up to 7.4.2 It does require full sun and moist sites. Send us a photo and we will provide you with a no-obligation analysis, so you can be sure what your weedy worry is. Why Is Himalayan Knotweed A Problem? Japanese Knotweed Management Company is a subsidary Company of Asbestos Management Company Ltd. Himalayan balsam: controlling it on your land; Giant hogweed: controlling it on your land; First published 14 December 2015 Last updated 7 August 2020. 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. Japanese Knotweed Management offers a survey service that will quantify the extent of the problem and provide a long-term solution. Himalayan knotweed is highly invasive as it spreads vegetatively, grows quickly, shading out native species, and is a habitat generalist. It can cause declines in native plants, including rare or localised species, due to their quick growth and shading out other plants. Smaller infestation of Himalayan Balsam can be controlled by hand-pulling. 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. Stems are 2-3 m tall and are branched in the upper half. Himalayan Knotweed (Persicaria wallichii) This Asian herbaceous perennial shrub is another member of the Polygonaceae family which is often mistaken for Japanese Knotweed. Japanese, Sakhalin, Bohemian, and Himalayan knotweeds . Japanese Knotweed Ltd are experienced contractors in the surveying and remediation of invasive non-native plant species, including Himalayan balsam. There are traditionally two methods of dealing with Himalayan Balsam, Non-Chemical and Chemical. If you've ever wandered along a riverbank, pond or lake, we guarantee you will have seen it at least once! 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. 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 is native to south and central Asia, including the Himalayas. These are giant knotweed (Fallopia sachalinensis), Japanese knotweed (F. japonica) and Bohemian knotweed (F. x bohemica). Canes are hollow and have jointed nodes. Himalayan Balsam First introduced to the UK in 1839, its rapid growth and attractive flower made it a favourite with gardeners and the seeds were happily shared and traded. Of course, with Himalayan balsam growing incredibly tall and in difficult to reach places, this method can be time-consuming and often ineffective. How to identify Japanese knotweed.. TCM Knotweed Removal Services offer a range of treatments to control, remove and eradicate Himalayan Balsam completely from your property. The herbicide used depends largely on the local environment and the timescale required removing the weed. Himalayan Balsam removal. It can grow quickly and costs will grow as the plant does. Himalayan knotweed is a perennial, herbaceous plant with a woody root. It forms dense clumps which can be up to three metres in height. TCM Knotweed Removal Services offer a range of treatments to control, remove and eradicate Himalayan Balsam completely from your property. Growth Form / Reproduction: Perennial. There are traditionally two methods of dealing with Himalayan Balsam, Non-Chemical and Chemical. Alternatively, you can contact the team using our contact form. Mature leaves are 20 - 40 cm long. (Polygonum cuspidatum), giant knotweed (P. sachalinense), and Bohemian knotweed (P. x bohemicum, a hybrid species). Displaces native species by forming dense … Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has characteristics of both parents. It can grow quickly and costs will grow as the plant does. Using herbicides is an extremely effective method to control Himalayan balsam. 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 Specialists are renowned within the industry as one of the UK’s leading contractors in the removal, treatment and control of Japanese Knotweed. If you have problems with Himalayan Balsam, Buddleia and Ragwort to name a few, Wise Knotweed Solutions is here. 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. Himalayan Balsam can spread through its exploding seed pods. Himalayan Balsam control can involve the use of chemicals although there are some non-chemical control measures that can also be used. Each spring, bamboo-like stems emerge, growing rapidly to achieve a height of 1.5-2.0 metres when fully grown. Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. We’re also part of The LK Group of companies, providing expertise in a range of sectors within the environmental industry. Himalayan knotweed is native to south and central Asia, including the Himalayas. Can reduce the quality of fish and wildlife habitat in riparian areas. 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. 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. The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. … This plant was introduced as a garden plant in Victorian times, but is much less popular today. 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. 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. 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? Himalayan Knotweed. For full functionality of this site it is necessary to enable JavaScript. Japanese knotweed. Himalayan Knotweed can be identified by its elongated leaves. Die back in the winter can leave areas vulnerable to erosion. Most King County offices will be closed on December 25, for Christmas Day. Due to their widespread use, the lack of natural predators, and their ability to spread by root and stem fragmen… Control options are intensive in terms of both labour and cost. We are pleased to offer our Japanese Knotweed solutions and other invasive weed removals nationwide to … The objective of any Himalayan Balsam control measures and treatment plan is to prevent the plant flowering, dispensing its seeds and spreading further afield. Related. Fast professional service with fully qualified staff for any job, large or small. Japanese, Sakhalin, Bohemian, and Himalayan knotweeds . Invasive weed control on Council owned land. Weed Control in Natural Areas in the Western United States. This highly invasive weed can grows up to 3 metres in 3 months. 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. Other Common Names: None. 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. Under this Act, “an occupier1 must control noxious weeds growing or located on land and premises, and on any other property located on • Giant knotweed - Leaves are deeply curved and heart shaped base (cordate). 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. Japanese knotweed, giant hogweed and Himalayan balsam are three of the most common invasive non-native plants in Northern Ireland. Each year after that you must map the affected area following control work, each year. These clumps or thickets are known as ‘stands’. They hybridize to produce Bohemian knotweed. For more information, see Noxious Weed Lists and Laws or visit the website of the Washington State Noxious Weed Control Board. [ - Japanese Knotweed Fallopia japonica Invasive Species Identification and Control Guide Species Description Japanese Knotweed is a native plant species in Japan, China and Taiwan. 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. Mix carefully, but thoroughly between steps. 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 is just as capable of reducing the value of a property as Japanese knotweed. Manual control. This plant is similar to Japanese knotweed, but has longer, pointed leaves. Himalayan Balsam Removal Specialists. Other invasive weeds. For any help in removing Himalayan Balsam or Japanese Knotweed, please contact Japanese Knotweed Specialists. Invasive Species Guide: Himalayan Balsam 1 | P a g e Invasive Species Guide: Japanese Knotweed Photos are sourced from GBNNSS, Trevor Renals and CABI. Polygonum polystachum CONTAIN Family: Polygonaceae (Knotweed). Stems are solid not hollow like the other invasive knotweeds on the noxious weed list. Contact US ABOUT HIMALAYAN BALSAM control. 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. 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. If the Himalayan Balsam is near a water-course the use of chemical control may be impossible. 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. Leaves can be up to 2.5 feet long, and flowers are greenish-white. 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. The heaviest concentrations are along rivers and roads, but knotweed is also found in backyards, forests, parks, and farms. We will survey a site and establish the best method and price for control or eradication in accordance with your requirements. Himalayan Knotweed can be identified by its elongated leaves. Himalayan knotweed (figure 6) grows to 6 feet tall. 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. Seed pods on Himalayan Balsam are usually visible from May onwards, therefore plan your treatment in April/Early May. 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. In Washington State, “noxious weed” is a legally defined term. You need the Knotweed Management Company! Legal Status: None. These are giant knotweed (Fallopia sachalinensis), Japanese knotweed (F. japonica) and Bohemian knotweed (F. x bohemica). How to control Himalayan Balsam. The Stationhouse, Station Road, Dundrum, Co. Tipperary, Ireland. For a copy of the guidance to control Japanese knotweed in construction and landscape contracts contact plant.health@gov.wales. 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 … All four knotweed species have similar ID characteristics and growth habits; each species is presented in detail below. For more information, see Noxious Weed Lists and Laws. You must prevent Japanese knotweed on your land … 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. 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. Margins or veins on the underside of the leaf have distinct multi-cellular hairs. It tends to grow in dense, mounded clumps. In Japanese knotweed, male and female flowers are on Weed Control in Natural Areas in the Western United States. 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. Small areas can be hand dug, although care must be taken to remove as much as the root system as possible. Download the Himalayan Balsam information sheet - PDF. As another persistent non-native species, regulatory bodies advise that it is managed in the same way as Japanese Knotweed.