�n. and management of Japanese Knotweed. Foreword. section i – general best management practices 6 soil disturbance and stabilization 7 movement and maintenance of equipment 8 mowing 9 disposal of plants 10 excavated material 12 section ii – nhdot priority invasive plant species 13 knotweed 14 purple loosestrife 17 phragmites 20 oriental bittersweet 23 spotted knapweed 25 The Code provides best practice advice and guidance aimed at contractors carrying out Japanese knotweed remediation works and will be useful for developers, planners and contractors who may encounter Japanese knotweed in … Effective management involves including best management practices as part of your overall plan – including ensuring that clean fill is used, vehicles are cleaned, and properties are inspected periodically throughout the process. Use an applicator wand with a sponge on the end of a reservoir for the herbicide. 15 i 1.0 ERAL PRACTICES FOR INVASIVE PLANT REMOVAL GEN 2.0 ERAL PRACTICES FOR RESTORATION PLANTING GEN 3.0ARGET PLANT PROFILES AND SPECIES SPECIFIC BEST MANAGEMENT PRACTICES 2T ��N"�y!� �ۍv2�7��eh+ �0��������q�;�N��2�G��1�Y���Ao� ��&�ɚ3q��hͩ�hZz}~S�͇ ON"�D�W��lo-k�R8aŦE�22,G�rS��u���v�Nh����|QH2! of Practice – Managing Japanese Knotweed on development sites. For more information on Japanese Knotweed, download our Best Management Practices and Technical Document, available at … Both seeds and rhizomes (horizontal plant stems growing underground) could survive and grow in compost, unless high enough temperatures are reached to kill the reproducing structures. Thick layers of decomposing stems and leaves on the ground make it difficult for native plant species to establish. Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has of the community and landowners. After several revisions, the publication was withdrawn on 11 July 2016: "This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance." 99 Christie Lake Road. Plant populations are extremely persistent. The Early Detection & Rapid Response (EDRR) Network Ontario project aims to train and equip volunteers with the skills and resources needed to better detect and reduce invasive species in Ontario, one community at a time. Leaves: alternate and are oval to triangular in shape. Do not compost Japanese knotweed in your backyard composter. This guide also details restoration options and knowledge gaps about Japanese knotweed. This invader is very persistent and once it becomes established, is incredibly difficult to control. Daniel Jones is Managing Director of Advanced Invasives that delivers a range of consultancy services, including how best to manage Japanese knotweed. Japanese knotweed is best controlled by the application of a suitable herbicide. Leaves are ovate with a flat base, reaching 3-6 inches long and 2-5 inches wide with pointed tips. There is no quick fix to killing Japanese knotweed infestations. Standards, "best practice" and technical guide for Japanese Knotweed . OFAH/OMNRF Invading Species Awareness Program. �����$�j����Z�?4L��~��Y���p&.��=�_��I��|b�LZ��9��,Z4�а�`Xg���گ�� *����4m1���;=Z��0.OW�Qr���#��zm�[���)9���e�Ҏ�b���$gV�}mdY���"V0�O��f��v�ǿ{péV��L?X�y+ۿA_�;��l%� For knotweeds, the control phase takes at least two seasons, and often includes at least two treatments in year one, followed by at least one treatment in year two. Japanese knotweed Japanese knotweed (Fallopia japonica), is an invasive herbaceous perennial (a plant that can live more than one year). Knotweed management is more complex if it's growing among planted trees (CP 3A and CP 22 practices). The Code of Practice laid out land managers’ and contractors’ responsibilities, as well as best practice for dealing with Japanese knotweed surface growth, rhizome and soils containing Japanese knotweed, and introduced many to the concepts of cross-contamination, clean sites, knotweed management plans and methods for remediation. For more information on the Invasive Species Act and Regulations visit www.ontario.ca/invasionON. Knotweed Information Sheet – Comox Valley Regional District. Japanese knotweed, also known commonly as ‘bamboo’, is a native of Japan that was brought to the It is very difficult to manually control the spread of this species, and can have potentially devastating impacts on riparian areas or infrastructure. Japanese Knotweed: This management guide provides information on the identification, dispersal, introduction history, management techniques of Japanese knotweed. 4 0 obj 3 0 obj Wick Wipe. Want more in-depth information? This one-hour introductory course is intended to improve awareness, detection and control of invasive species in our region. <> This BMP was developed by the Green Ribbon Initiative and its partners and uses available research and local experience to recommend environmentally safe control practices. Japanese knotweed is a shrub-like, semi-woody perennial growing up to 9 feet tall. Dense thickets can reduce sunlight penetration by more than 90% and its thick mats of dead and decaying vegetation in fall/spring prevent other plant species from growing by shading them out. <>/Metadata 506 0 R/ViewerPreferences 507 0 R/PageLabels 508 0 R>> Stems: If glyphosate is applied correctly, at the appropriate time of year, it is possible to eradicate it, although it can take two to … <> Planning Considerations • Survey the area for weeds, set priorities, and select the best control method(s) for the site. It is an offence to plant or to cause Japanese Knotweed to grow on your farm. Because of knotweed’s incredibly extensive root … Origin. doug.cygan@agr.nh.gov . Knotweed Information Sheet – Comox Valley Regional District. Summary Findings from Knotweed Workshop Held March 2015 Rhizomes: a large underground root system capable of producing new plants. stream Want more in-depth information? Reduces plant biodiversity by competing with other native vegetation. Standards, "best practice" and technical guide for Japanese Knotweed. … endobj Forest and Range Practices Act- requires forest and range managers to specify and implement measures that prevent the introduction or spread of invasive plants, including knotweed species, within their forest stewardship plans, woodlot license plans, range use plans, and range stewardship plans. Use glyphosate at 33 to 75 % concentration (or as directed on product label). x��}ێ$;r�� ��(8��&3�E�3=�,`�.�ABKZc1dž��}3nd�IVu�dkf�=�d%o�`����]~������?~�������w������?��_���fY]��%E��덻��>~���_/�YBL����]~����%p���_RJ��?�b��5E�/{n�M�a�/�ښe�p��wnw�D��ӲRi5vIԚ��~s#*��jfD=�D�s*�v���?������墀c8.+�e�/� ���?���K01� .,�&,�-��m��� "T�+JABe�ܒ;Y�m1��p `�a/\��p��{���Oadߤ� �=L���? Never buy or plant Japanese knotweed. Who We Are. Mechanical control Single young plants can be pulled by hand depending on soil conditions and root development. The Environment Agency's Japanese knotweed code of practice was originally published in 2006. Prevent spread of Japanese knotweed. 0����8������n��\��ߴ��������/����?g����]���y��#s���{�⾄���7s��'��?���~�n������z)y��~gK��� �,��P�Y�Ru��/u+�Hҳ��b����ִP��Ԟ�\���饎f�`E��[V�z�Шs��5͜;G���3��m[V^U��O�|�����%o������z���#��]�K3�=�����ęL��q1�bx��/5_`�k�������� L��@�4{)�Y�"���ln���+��Ƕ"�`�)�� ,nnG�s;bƆ�\tKʄ5s�uD2�.�!$��"�Y�ڭ ��ʯ��/��tH�W@y�_k[՟)3���Uۇ�cï(�7�#�M�7`�����7d3��vÙ��������_÷T ��k���\Ñp��E8�u�.�h��eru"��v����`�����,g/h�"�r�i��f64��ւf��YE�P����gU���=�Q�@&�~�Ѷ]Z�ƭ���s�8$}��E��� �4��_�¯�%�����7dykKW����8��D�O��yV׻YY������ 5�m���3�@�%��6��ݘ���6��d� However, the Property Care Association - the UK's trade association for specialists who deal with … If all of the root system isn’t removed, re-sprouting can occur. Department of Agriculture, Markets & Food . Japanese Knotweed Best Management Practices. Japanese Knotweed - Best Management Practices (2.31 MB) Purple Loosestrife - Best Management Practices (1.20 MB) Reed Canary Grass - Best Management Practices (2.72 MB) Welcome to the Property Care Association (PCA) code of practice for the management of Japanese Knotweed. Welcome to the Property Care Association (PCA) code of practice for the management of Japanese Knotweed. Invasive Species in Metro Vancouver: An Online Course . Japanese Knotweed (Polygonum cuspidatum) Japanese Knotweed, leaves. Japanese knotweed (figures 1 and 2) can grow to 10 feet tall and has oval-shaped, sharply tipped leaves and white flowers. This document sets the principles, standards and guidelines to which qualified PCA members work. The two industry trade bodies (PCA & INNSA) produced their own codes that provide the highest shared standards of best practice. The guide to. (2012). Japanese Knotweed – Polygonum cuspidatum . When leaving an area containing Japanese knotweed, inspect, clean and remove mud, seeds and plant parts from clothing, pets (and horses), vehicles (including bicycles and ATVs), and equipment such as mowers and tools. Do not move soil that may contain knotweed rhizome fragments to uninfested areas. Management will require dedication for a number of years and should allow flexibility in methods. Native to Japan, China, Korea, and Taiwan, Japanese Knotweed was introduced to North America in the late 19th century as an ornamental plant, for livestock forage, and for erosion control 1, 2.. Japanese Knotweed is an invasive herbaceous perennial that grows in a variety of soil types and is highly adaptable to extreme temperatures, salinity, droughts, and floods 3. Best management practices and target plant profiles Japanese Knotweed Scotch Broom Giant Hogweed June 2014. 603-271-3488 . *C�VC��gKwy��F0�Y���A�eG#�ņ+C}�c��S�눌>���蒀 _”�������D�u�̀�?H�kc?_�N���^��@�����|�8�������h^@�eP�Q�.s�O�;$�2Ĭ4O��0 �t&zg�;\)��+�-��i@��9����0��RY�*�-�"�I�һ���|^"������P����u � �9 xp���'Y|��n-7 �4��O�[�� ���11������J����}�#����a��d���"v��q7Y��n�9�;B��~V_�K�(�4�ͪh�H�[+u�iڗ@]����}���Cv���0�Rj�������=�����";B���OAU#���/[ݗ��lz#��q�z4i�*`�u��\�� Leaves can be up to 2.5 feet long, and flowers are greenish-white. This factsheet may be reproduced for non-commercial purposes. The Code provides best practice advice and guidance aimed at contractors carrying out Japanese knotweed remediation works and will be useful for developers, planners and contractors who may encounter Japanese knotweed in … Japanese Knotweed is an invasive species that can produce a new plant in as little as six days. Ontario composting facilities monitor the compost process and meet provincially regulated temperature requirements. It is against the law to buy, sell, trade, propagate or purposely grow Japanese knotweed. Stay on designated trails and keep pets on a leash. Pest Management – Invasive Plant Control . These Best Management Practices (BMPs) are designed to provide guidance for managing invasive plants in Ontario. By Paolo Martini on 2nd July 2019 (updated: 18th November 2020) in News. K7H3C6. %���� In Ontario, it is mostly established in southern and central areas of the province where it mostly grows in gardens, along roadsides and near old buildings or former building sites. BEST PRACTICE MANAGEMENT GUIDE FOR INVASIVE ALIEN SPECIES 2 GOOD PRACTICE MANAGEMENT GUIDE FOR Japanese knotweed (Fallopia japonica) Other names: Also known as Polygonum cuspidatum by Japanese and American authors but, following Meissner's 1856 classification, as Fallopia japonica in Europe • BC Ministry of … This Best Management Practice (BMP) document provides guidance for managing Japanese Knotweed in the Oak Openings Region of Northwest Ohio and Southeast Michigan. This knotweed code of practice has been written for anyone involved in the development and haulage industry who may encounter sites with Japanese knotweed, or soil containing it. Funding and leadership for the production of this document was provided by the Ontario Ministry of Natural Resources (OMNR). 603-271-3488 . of Practice – Managing Japanese Knotweed on development sites. Japanese knotweed can severely degrade the quality of wetland and riparian habitats where it becomes established. Description. The code of practice below aims to provide a thorough and technical guide to the management of Japanese Knotweed. You can also call Crime Stoppers anonymously at 1-800-222-TIPS (8477). Japanese Knotweed. ; syn. Japanese knotweed is often mistaken for bamboo; however it is easily distinguished by its broad leaves and its ability to survive Ontario winters. Stems are round, reddish-purple, smooth and have a bamboo-like appearance. Conservation Practice Job Sheet NH-595 . Best management practice A variety of ways to control knotweed (under "knotweed")(USA) Strategies for the eradication of Japanese knotweed %PDF-1.7 Perth, ON. This Best Management Practice (BMP) document provides guidance for managing Japanese Knotweed in the Oak Openings Region of Northwest Ohio and Southeast Michigan. Japanese knotweed is an aggressive semi-woody perennial plant that is native to eastern Asia. THIS PAGE IS INTENTIONALLY BLANK. endobj Plants are able to survive severe floods and recolonize areas. Summary Findings from Knotweed Workshop Held March 2015 section i – general best management practices 6 soil disturbance and stabilization 7 movement and maintenance of equipment 8 mowing 9 disposal of plants 10 excavated material 12 section ii – nhdot priority invasive plant species 13 knotweed 14 purple loosestrife 17 phragmites 20 oriental bittersweet 23 spotted knapweed 25 King County, USA, Best Management Practices for Knotweed. Y�'�'r�Ƅ��IF"�?]Y�P=? It is against the law to buy, sell, trade, propagate or purposely grow Japanese knotweed. 2 0 obj Stay on designated trails and keep pets on a leash. Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. Glyphosate-based herbicides are commonly used to treat Japanese knotweed. … How to identify Japanese knotweed.. The Early Detection & Rapid Response (EDRR) Network Ontario project aims to train and equip volunteers with the skills and resources needed to better detect and reduce invasive species in Ontario, one community at a time. If you have any information about the illegal importing, distribution or sale of Japanese knotweed, report it immediately to the MNRF TIPS line at 1-877-TIPS-MNR (847-7667) toll-free anytime. doug.cygan@agr.nh.gov . Check before applying to knotweed in areas with standing water 1-2% glyphosate (aquatic-approved formulation) Best sprayed in late summer/early fall Spraying at ... Best Management Practices (BMP) and Treatment ; Knotweed treatments Theme . Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. Control Methods for Japanese knotweed New Hampshire . Ontario Invasive Plant Council, Peterborough, ON. Invasive Plant Council of BC – Knotweed. It has since spread throughout the United States and Canada. Japanese Knotweed: Invasive Plant of Southwestern BC. There are two affective methods for controlling Japanese knotweed (Polygonum cuspidatum), henceforth referred to as knotweed… Japanese Knotweed Best Management Practices. It is therefore essential to implement control as soon as it is identified to avoid the risk of prosecution and fines. Wipe the sponge soaked with herbicide on the leaves and stem of the plants. BC Government Information on Invasive Plants. This knotweed code of practice has been written for anyone involved in the development and haulage industry who may encounter sites with Japanese knotweed, or soil containing it. Japanese knotweed is especially persistent due to its vigorous root system, which can spread nearly 10 metres from the parent stem and grow through concrete and asphalt. After several revisions, the publication was withdrawn on 11 July 2016: "This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance." Japanese Knotweed flowers blooming in sprays. Japanese knotweed is semi-shade tolerant but grows best in full sun. Japanese Knotweed: Invasive Plant of Southwestern BC. Japanese knotweed (Fallopia japonica) is an invasive perennial and noxious weed in PA. The Environment Agency's Japanese knotweed code of practice was originally published in 2006. Learn how to effectively manage Japanese knotweed on your property. To prevent the further spread and introduction of this unwanted invader in the province, Ontario has regulated Japanese knotweed as restricted under the Invasive Species Act. MISC (Default) IPS Suite Original . <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Learn how to identify Japanese knotweed and how to avoid accidentally spreading this invasive plant through its root fragments and seeds. Invasive Plants of Southwestern BC: Japanese Knotweed. The BMPs were developed by the Ontario Invasive Plant Council (OIPC), and its partners to facilitate the invasive plant control … Identify Japanese knotweed. One of the best ways to prevent its colonization is to ensure that disturbed habitats are rehabilitated with native vegetation before knotweed can invade. BEST MANAGEMENT PRACTICES Invasive Knotweeds Bohemian Knotweed, Japanese Knotweed, Giant Knotweed, Himalayan Knotweed (Polygonum bohemicum, P. cuspidatum, P. sachalinense, P. polystachyum) (Family— Polygonaceae —Buckwheat Family) Legal Status in Jefferson County: Class B noxious weed (non- These are then loaded into a large vehicle and transported to a licensed landfill site and then disposed of safely. Check, Best Management Practices for Japanese knotweed, Japanese Knotweed - Best Management Practices, Invasive Plant Species - Quick Reference Guide, Grow Me Instead (Southern Ontario) – Brochure, Grow Me Instead (Northern Ontario) - Brochure, Ontario Ministry of Natural Resources and Forestry, Ontario Ministry of Agriculture, Food and Rural Affairs – Ontario Weeds, Ontario Invading Species Awareness Program. The plant develops small winged fruits Seeds: triangular, shiny, very small, about 1/10 inch (2.5 mm) long. Improvements on recommendations are based on experiential data of PCA members with long-standing proven records in Japanese Knotweed control. Riparian management: Best Practice ... Japanese Knotweed is regarded as Britain's most invasive plant. Douglas Cygan . As with most invasive plants, Japanese knotweed can quickly inhabit disturbed ecosystems. These Best Management Practices (BMPs) are designed to provide guidance for managing invasive plants in Ontario. JAPANESE KNOTWEED SITE SUPERVISION In some situations, where the client has machinery and labour on-site, we can provide site supervision (Watching Brief) to ensure removal in accordance to the Property Care Association (PCA) Code Of Practice. endobj Control Methods for Japanese knotweed New Hampshire . The code of practice below aims to provide a thorough and technical guide to the management of Japanese Knotweed. For any organisation currently concerned about Japanese knotweed, INNSA’s new Code of Practice provides an excellent starting point to understand the issues surrounding the management of Japanese knotweed and the remedial actions required. Semi-woody perennial plant capable of reaching 1-3 metres in height. Contact your local municipality to determine if plant material can be brought to their composting facility. You will need to cut the knotweed earlier and more often to prevent it from canopying over your tree plantings. For small initial populations beyond single plants, or in environmentally sensitive areas wher… Aggressive plant with a strong root system that has been known to break through asphalt and concrete. Japanese knotweed can block or interfere with access to water for activities such as canoeing, boating, angling, and swimming (Japanese Knotweed BMP). Chemical control plans should always include three phases: 1) control, 2) maintenance, and 3) ecological restoration. This guide also details restoration options and knowledge gaps about Japanese knotweed. Never buy or plant Japanese knotweed. 1 0 obj Lists general information and resources for Japanese knotweed. King County, USA, Best Management Practices for Knotweed. Leaves are simple, alternate, up to 6 inches long by 4 inches wide, and broadly ovate with pointed tips and a square base. Implementing best management practices for roadside maintenance activities and making minor adjustments to mowing schedules can control the establishment and spread of invasive weeds. PHASED APPROACH. The guide to Best Management Practices for Japanese knotweed describes the most effective and environmentally safe control practices for this species. Columbia: Japanese knotweed (Fallopia japonica), Giant knotweed (Fallopia sachalenensis), Bohemian knotweed (Fallopia x bohemica), and Himalayan knotweed ... Best Management Practices in Ontario. Who We Are. This BMP was developed by the Green Ribbon Initiative and its partners and uses available research and local experience to recommend environmentally safe control practices. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. “The Environment Agency initially authorised the practice as a comprehensive guide to all those dealing with this problematic species. Giant knotweed (figure 3) is taller than Japanese knotweed. The aim of this Code of Practice is to provide guidelines that set the principles and … Japanese Knotweed Code of Practice When the Environment Agency withdrew its ‘Knotweed Code of Practice’ in 2016 the industry took on the mantle of providing best practice guidance on managing knotweed. These Best Management Practices (BMPs) provide guidance for managing invasive Japanese Knotweed (Fallopia japonica) in Ontario. These practices will also reduce future costly maintenance activities. Japanese Knotweed: This management guide provides information on the identification, dispersal, introduction history, management techniques of Japanese knotweed. Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. Heres a quick overview of the treatments ISN has found most successful for controlling knotweeds: Milestone (aminopyralid) Faster kill (~3 years), more off-target effects Standard rate (3-7 oz/acre; 0.01%) Using nonionic surfactant (standard rate) Late … You must prevent Japanese knotweed on your … © 2020 Ontario's Invading Species Awareness Program, Due to COVID-19, the OFAH has modified operations. taxa (Reynoutria spp. As with the single mowing approach, allow at least six weeks after the last mowing before you spot treat the knotweed with glyphosate King County, USA, Best Management Practices for Knotweed The BMP documents listed below for individual noxious weed species (or group of species) cover impacts, history, identification, reproduction and spread, local distribution, and control methods including prevention, manual, mechanical, biological and chemical methods, a summary of recommended best management practices for different sites, disposal guidelines and references for further … Japanese knotweed showing oblate leaves and flowers. No matter the size of your infestation, completely eradicating this pest can take years [1]; cutting corners at any point in the process could lead to a never-ending battle or, worse still, a hefty fine. Japanese Knotweed . If you’ve seen Japanese knotweed or other invasive species in the wild, please contact the toll free Invading Species Hotline at 1-800-563-7711, or visit. Species Profile - Japanese knotweed (Fallopia japonica), National Invasive Species Information Center, United States National Agricultural Library. Leaving trails or entering areas containing Japanese knotweed can encourage the spread of this plant. Fallopia spp. Department of Agriculture, Markets & Food . Retrieved from: www.invadingspecies.com. Since we never made such a recommendation and since we think that, in order to successfully control invasions by Japanese knotweed s.l. Do not plant knotweed as an ornamental and eradicate any existing plants from your property. In the 1800’s it was introduced to North America as an ornamental species and also planted for erosion control. In 2006 the Environment Agency (EA) published a best practice document entitled “Managing Japanese knotweed on Development Sites – the knotweed code of practice”. Japanese knotweed (Fallopia japonica, P. cuspidatum) Giant knotweed (Fallopia sachalinense, P. sachalinense) Himalayan knotweed (Fallopia polystachyum, P. polystachyum) Buckwheat Family INTRODUCTION Identification Tips In the Pacific Northwest, there are four similar species of invasive knotweed that are difficult to tell apart and share Japanese knotweed spreads primarily by seed (transported by wind, water, animals, humans, or as a soil contaminant), stem fragments, and by shoots sprouting from its system of rhizomes. For more information on best manage-ment practices, see page 6. … In Canada, Japanese knotweed is established from Ontario to Newfoundland and is also found in British Columbia. Tom Heutte, USDA Forest Service, Bugwood.org Japanese knotweed Fallopia japonica (Polygonum cuspidatum) The final of our Japanese knotweed management methods is the excavation of any and all soils containing the possibility of Japanese knotweed rhizome. This article will assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. Douglas Cygan . The first record of Japanese Knotweed in Ontario is from 1901, in Niagara Falls and is now reported in many locations throughout southern Ontario, and as far north as Thunder Bay. How To Get Rid Of Japanese Knotweed. Since it was introduced as an ornamental plant in the 19th Century from Japan, it has spread across the island of Ireland, particularly along watercourses, transport There are two affective methods for controlling Japanese knotweed (Polygonum cuspidatum), henceforth referred to as knotweed… A strictly regulatory response to violations is not the most effective way to manage for Japanese knotweed. Spreads quickly, creating dense thickets that degrade wildlife habitats. Japanese knotweed hybridizes with giant knotweed to form the Bohemian knotweed species. … King County Noxious Weed Control Program KNOTWEED BMP 206-477-9333 Website: www.kingcounty.gov/weeds JULY 2015, Page 10. Ontario’s Invading Species Awareness Program is a partnership between the Ontario Ministry of Natural Resources and Forestry (MNRF), and the Ontario Federation of Anglers and Hunters (OFAH). Fruit is small and white with wings that help to disperse seeds to new sites. Japanese Knotweed(Fallopia japonica) Best Management Practices. Related information: It is found along roadsides, stream and river banks, wetlands, wet depressions and woodland edges, and can tolerate a wide array of soil and moisture conditions. Claimed to be the most downloaded document in the history of the Environment Agency, the Code of Practice represented the highest shared standards of best practice within the knotweed removal industry. BEST MANAGEMENT PRACTICES Invasive Knotweeds Bohemian Knotweed, Japanese Knotweed, Giant Knotweed, Himalayan Knotweed (Polygonum bohemicum, P. cuspidatum, P. sachalinense, P. polystachyum) (Family— Polygonaceae —Buckwheat Family) Legal Status in Jefferson County: Class B noxious weed (non- Introduction history, management techniques of Japanese knotweed is regarded as Britain most... Effective and environmentally safe control Practices for Japanese knotweed hybridizes with giant knotweed grow! 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