This plant and synonym italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. 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 … So you can check and update your cookies settings, you need to know what browser you are using and which version. At surface level the most obvious signs of knotweed damage will be where the plant starts to break through tarmac and paving stones. What should I do if I have a problem? According to 2016 cost estimates from the Rockingham County Conservation District (RCCD), the typical cost to manage knotweed using a glyphosate based product is approximately $500/acre for The visceral response a patch of Japanese knotweed evokes in scientists, naturalists and homeowners might surprise you. Another oft-cited reason to fear Japanese knotweed is the damage it can cause as it grows in search of moisture and nourishment. 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. Damage to your house – the plant’s invasive root system and strong growth can damage concrete foundations, buildings, roads, paving and retaining walls. Along with other features such as damp and structural defects, surveyors will take the risk of The amenity use of an outside space will be lost. E manchester@knotweed.co.uk, Some of these cookies are essential to make our site work and others help us to improve by giving us some insight into how the site is being used. In the worst cases, the drains must be renewed. The mass of the stands can ‘push over’ retaining walls/fences, often resulting in sudden collapse. It’s an invasive weed in Ohio, Vermont, West Virginia, New York, Alaska, Pennsylvania, Oregon and Washington. Japanese Knotweed can be treated in a number of different ways, and when choosing the steps to take – consideration must be given to various factors such as the economics, the ecology of the surrounding area and the potential further damage to property. Apart from the fact that Japanese knotweed can cause severe damage to your property, it can also affect the ability to sell your home, obtain a mortgage or property insurance. Polygonum cuspidatum), an herbaceous perennial member of the buckwheat family, was introduced from East Asia in the late 1800s as an ornamental and to stabilize streambanks. Failure to control it could also lead to a substantial fine or even prison, so this is not a problem that should be taken lightly. Knotweed roots can exploit existing cracks and gaps in the pipes in their search for water, which will further damage and, in some cases, block the drains. Managing these settings is highly recommended if you share access on your computer. – If left unchecked for long enough, Japanese Knotweed can establish itself and wreak havoc on residential and commercial properties. Apart from the fact that Japanese knotweed can cause severe damage to your property, it can also affect the ability to sell your home, obtain a mortgage or property insurance. This dangerous plant, once rooted on your property, is almost impossible to remove. In the UK, Japanese knotweed is widely believed to pose a significant risk of damage to buildings that are within seven metres of the above-ground portions of the plant – the so-called ‘seven metre rule’ – due to its underground shoots, known as rhizomes. 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. But updates to the guidance documents now specifically name Japanese Knotweed alongside Himalayan Balsam and Giant Hogweed as a source of “serious problems” and state that individual failing to control the troublesome triffid will have committed a criminal offence and be liable for a fine of up to £2,500. 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. 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