Originally from eastern Asia, Japanese knotweed was introduced to North America in the late 1800s as an ornamental. The Japanese Knotweed isn't just Britain's problem. Japanese Knotweed Brochure . & Zucc. Invasive and difficult to get rid of, if your home or land becomes infested with this plant it can damage and devalue your property. To get rid of Japanese knotweed, start by using garden shears to cut off the canes as close to the ground as possible. Japanese Knotweed is a highly invasive plant and is recognised as the most invasive species of plant in Britain today. Learn how to effectively manage Japanese knotweed on your property. This invasive plant has hollow, smooth, purple to green coloured stems up to 2.5 cm in diameter. The hollow-jointed stems have reddish-brown solid nodes surrounded by a papery sheath. Knotweed is a highly successful invader of wetlands, stream corridors, forest edges, and drainage ditches across the country. There is no quick fix to killing Japanese knotweed infestations. Japanese barberry can be found in North America from North Carolina and Tennessee and north into Canada where it is found with a scattered distribution in southern Ontario, Quebec and Nova Scotia. Because Knotweed is so invasive and difficult to remove, it is not … It is against the law to buy, sell, trade, propagate or purposely grow Japanese knotweed. How To Get Rid Of Japanese Knotweed. Road and railroad rights of way and waterways are the main geographic pathways for spread within Ontario. To remove Japanese Knotweed … Plants are able to survive severe floods and recolonize areas. The Nature Conservancy (TNC) has successfully germi- Interestingly, Japanese knotweed is not a problem in Japan where it has natural enemies in the form of bugs and fungi, but here in the UK it is unfortunately predator free. Semi-woody perennial plant capable of reaching 1-3 metres in height. Aggressive plant with a strong root system that has been known to break through asphalt and concrete. Japanese Knotweed grows up to 10cm a day, so it is essential that you are quick and effective with removal. Growing up to a metre a month, it quickly suffocates other vegetation and aggressively colonises any ground where it’s allowed to flourish. Huzhang (Japanese Knotweed) has been used in traditional Chinese medicine as well as in Japan and Korea for many years. Japanese knotweed Polygonum cuspidatum, Japanese knotweed. He found it growing on the side of a volcano, and planned to use it as a beautiful ornamental plant that could be used in residential gardens. Japanese knotweed has an incredible ability to grow anywhere and thrive under adverse soil conditions. It grows at a ridiculous rate, is near-impossible to get rid of and has ruined house sales - … 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. Japanese Knotweed (Fallopia japonica) is a native of Japan and was introduced during the Victorian period as an ornamental garden plant. Japanese knotweed Polygonum cuspidatum, Japanese knotweed. 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. © 2020 Ontario's Invading Species Awareness Program, Due to COVID-19, the OFAH has modified operations. Do not compost Japanese knotweed in your backyard composter. It forms dense thickets of bamboo-like vegetation that aggressively outcompetes native plants and negatively impacts wetland and riparian areas. Its roots can destroy concrete foundations and blacktop roads. Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. Although once sold through seed and plant catalogs, by the late-1930s knotweed was already being viewed as a problematic pest. Once planted, the rhizome (root) expands rapidly, pushing out any other plants in the vicinity. Because it grows so fast in a wide variety of soil types, it can quickly spread, growing from underground roots (rhizomes). Although used for various applications, few clinical studies validate claims and guidance regarding dosing or safety is limited. Its natural habitat is on the side of volcanoes but it has spread into populated areas and has flourished on waste ground. It can establish along riverbanks, where pieces of roots can break off and float downstream to start new populations. Once planted, the rhizome (root) expands rapidly, pushing out any other plants in the vicinity. Juvenile stems resemble asparagus (Asparagus officinalis) spears and are purplish in colour, fading to green as they mature. Where did Japanese knotweed come from? Knotweed spreads by seed, but its primarily means is vegetative – through its rhizomes (root system). Forms dense thickets that reduce wildlife habitat, affect native plants and restrict recreational activities along trails. In introduced areas, it helps prevent erosion. We are experts at Japanese Knotweed removal, a company with a proven track record, with over 20 years working on commercial as well as domestic properties. ), a member of the buckwheat family, was introduced into the U.S. from Eastern Asia (Japan, China, Korea) as an ornamental on estates in the late-1800s. It is able to grow through concrete/asphalt up to 8 cm thick and building foundations. The whole flowering plant is used to make medicine. Japanese knotweed is an attractive plant that looks something like bamboo, but with broad leaves. It is of particular concern in new housing developments. There have been populations confirmed as far north as Thunder Bay and Sault Ste Marie. This factsheet may be reproduced for non-commercial purposes. Stems are round, reddish-purple, smooth and have a bamboo-like appearance. japonica, PF Zika, AL Jacobson – Rhodora, 2003 – JSTOR. Although once sold through seed and plant catalogs, by the late-1930s knotweed was already being viewed as a problematic pest.