Once established underneath or around the built environment, it can be particularly hard to control, in some cases growing through concrete and tarmac and other areas of hard-standing. There is a real risk when this plant is in your area that it may, in fact, infiltrate your garden. The risk of damage to native plant species from the psyllid has been shown to be very low, with a number of field trials taking place to ensure that the psyllid will destroy the Japanese knotweed and ensure that there are no negative impacts on native plant species. https://www.wiseknotweed.com/services/what-is-japanese-knotweed/damage This, combined with its zombie-like refusal to die, has made it into a big green bogeyman for the housing industry. Failure to do this means they can be held responsible for damages caused by this pernicious patio pest. While these plants can grow and exploit a range of site conditions, they seem most comfortable along riverbanks and roadsides here … At surface level the most obvious signs of knotweed damage will be where the plant starts to break through tarmac and paving stones. Both Japanese and Giant knotweed (Fallopia japonica and sachalinensis), the two species found here in Vermont, are natives to East Asia. Japanese knotweed is a highly invasive plant and one that can cause damage to property in its path. Ever eager to expand its territorial domination, Japanese Knotweed weed will infiltrate the tiniest of cracks and wind its wily way through drains and underground sewers. Japanese knotweed is an invasive plant, known to cause significant damage to structures and being notoriously tricky to get rid of. Japanese Knotweed. The strong roots can rampage under fences, damage paths and patios and work their way inside the cavity walls of houses, even emerging two storeys up out of the chimney stack. Japanese knotweed does however cause damage, both by its above ground canopy exerting pressure on adjacent walls/fences, but also by its expanding network of underground rhizomes and roots, and, for mature stands, its crown. Some descriptions would have you believe that Japanese knotweed is a rampaging triffid-esque plant monster, capable of demolishing any structure that gets in its way. If you have been affected by Japanese Knotweed damage, or you have bought a property without being warned of the potential for Japanese Knotweed infestation, we can help you claim compensation. What should I do if I have a problem? We use Google Analytics, so we can improve our website and service for both you and future visitors. If you suspect you have Japanese knotweed on or close to your house, but you’re not sure of the extent of its’ growth, contact us and we can help. Large, densely packed roots and rhizomes of Japanese knotweed can disrupt drain runs. Cupernham Lane,
Suzanne Lommen of the Institute of Biology Leiden is coordinating the field trials as part of a consortium which includes CABI, Leiden University, Koppert Biological Systems, Probos, STOWA and the Pest Species Work Group of the Dutch Water Authorities. – Again is left unchecked, Japanese Knotweed will grow with enough force to damage fences and even cause walls to fall. The invasive nature of the plant will ruin a garden or soft landscaped area. However, despite the plant’s fearsome reputation, there can still be some confusion as to what it actually does. It’s possible for Japanese knotweed to damage the foundations of a house, but this will only happen when infestations are long-established and there are already weaknesses in the building. Hampshire,
The Japanese knotweed psyllid should offer relief against the rampant Asian knotweed. Large, densely packed roots and rhizomes of Japanese knotweed can disrupt drain runs. If you’re thinking a plant can’t do much damage to your home you couldn’t be more wrong. Managing these settings is highly recommended if you share access on your computer. Fallopia japonica (Japanese knotweed) is a well-known invasive alien species in the UK and elsewhere in Europe and North America. Japanese Knotweed damage can be extensive. Japanese knotweed is a non-native invasive plant that can cause problems to your property/house. Typically blooming between late summer and early autumn, Japanese knotweed flowers are a distinct creamy white colour and form in clusters of up to 10cm long. Japanese knotweed – know the drill. Installed underground to prevent damage from tree roots, Japanese Knotweed and other invasive plant species, to underground services and existing structures. You are able to find this out by opening the browser, clicking on 'Help' and then 'About'. It prefers sunny, moist areas, including riverbanks, roadsides, lawns, and gardens. The Japanese knotweed, Fallopia japonica, is causing major damage to building foundations, pavements and dykes in the Dutch capital, costing millions of euros a year. Japanese Knotweed Damage to Drains and Other Buried Services. Cavity walls – Japanese Knotweed will grow up and through vents and air bricks two metres above ground, and once it’s in cavity walls it has the force to push the two skins of the wall apart. The pesky plant isn’t always easy to identify, and although it can look similar to bamboo, they are not in the same family. Based on the extensive rooting system, the majority (2/3) of Japanese knotweed plants occurs below ground. Crown Street,
Japanese knotweed can also seriously damage buildings, hard surfaces and infrastructure in some cases. Japanese knotweed will exploit existing weaknesses in property underground services, walls, foundations, fences, out-buildings and conservatories. E london@knotweed.co.uk, Unit 13A Westlink,
Another oft-cited reason to fear Japanese knotweed is the damage it can cause as it grows in search of moisture and nourishment. Phone: 0333 2414 413. Public and private landowners are not generally required to control infestations of Japanese 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. It can exploit any structural weaknesses in a property, affecting drains or fragile walls etc. Laboratory tests suggest the leaf fleas – Japanese knotweed psyllids, or Aphalara itadori–can kill young shoots and potentially stop the plant growing by sucking up its sap. Knotweed’s strong, robust plant structure means it can thrive in a wide range of growing conditions. Our expert Japanese Knotweed solicitors can help you make a claim to: 1. Japanese knotweed can grow up to 10cm per day, and because of this rapacious growth, it has been known to cause damage to building structures and substructures by targeting weak points, such as cracks in masonry, and attempting to grow through them. Underground services – With its insatiable thirst, Japanese Knotweed will worm its way into pipes through tiny cracks or... Hard surfaces such as asphalt – This is the Japanese Knotweed damage we see most often. Japanese Knotweed damage can be extensive. Not sure if it’s knotweed? For new builds, it can be used to line the foundations, for full protection. Check out our article on, Smith v Line: The cost of allowing Japanese Knotweed to spread, The Grounds Care Group Acquires Japanese Knotweed Management, Read about Japanese Knotweed in FMUK magazine, Building Engineer Magazine publishes article on Knotweed, The consequences of letting Japanese Knotweed spread. Because it's encrypted, your information is kept safe and secure. 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