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