As determined by the Court in the decision of Williams and Waitsell v Network Rail, owners have a duty of care to ensure that Japanese Knotweed does not spread from their land. How Does Japanese Knotweed Spread? Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. Most house insurance policies will not cover losses incurred as a result of Japanese Knotweed. Lenders are cautious with properties that are affected by Japanese knotweed, but its not impossible to get a mortgage or re-mortgage. The rhizomes can grow up to 7 m out from the parent plant and up to 3 m deep. Seasonal floods sweep plants into rivers and creeks. Can Japanese knotweed affect mortgages. If it is given the right amount of space and nutrients, it is able to grow indefinitely. The 2018 study also found that Japanese knotweed rhizomes rarely extend more than 4m from the visible plants, and usually spread less than 2.5m. Instead, the plant spreads by growth of its rhizomes and by fragmentation. How does it spread? This i s a complex and challenging procedure best undertaken by a reputable and specialist company. Japanese knotweed ( Fallopia japonica ) is a weed that spreads rapidly. There is no limit to how far a Japanese knotweed infestation can spread, which is why it has become such a nuisance for so many in the UK over the last decade or so. The plant also spreads through underground rhizomes, although spreading by seed has not been recorded in the UK. Japanese Knotweed will grow absolutely anywhere, growing just as well in poor soil as it will in good soil. What Does Japanese Knotweed Do? It spreads through unintentional or deliberate movements of the plant’s chopped stems or fragments of the roots. Japanese Knotweed is best controlled sooner rather than later – if left unattended it will spread and become more difficult to control. Japanese Knotweed can grow up to ten cm per day, with roots growing out in a seven-metre radius, meaning it can quickly spread from one garden to another, infesting whole areas. But the weed soon spread like wildfire. These can be up to 3m (10 feet) deep and can extend out to 7m (23 feet) from the parent plant. To see just how fast Japanese Knotweed spreads, here is a time-lapse video of Japanese Knotweed growth. Knotweed does not normally spread by seeds. No, As the Japanese knotweed in the UK is female only, the seeds produced are not viable and cannot cause spread. How does Japanese Knotweed Spread? This is much less than the 7 metres commonly cited as the risk zone. It is a tenacious plant. #4 Don’t do any DIY removal if you plan on selling your home . You need to dispose it at a licensed landfill site. Does house insurance cover Japanese Knotweed? The Japanese Knotweed Key Legal Case – Williams and Waitsell v Network Rail. The plant flowers late in the season, August to October, with small creamy-white flowers hanging in clusters. Mechanical flails and mowers will also spread the plant. How does Japanese Knotweed spread? Knotweed spreads vegetatively by rhizomes and also sprouts from fragments of root and stem material, which are dispersed by water, equipment or in fill. The Spruce / Jordan Provost. It needs very little to grow and survive. This isn’t to suggest that Japanese knotweed doesn’t damage buildings – it can and it does. How far does Japanese knotweed spread? How does Japanese knotweed spread? How does Japanese knotweed spread? What does Japanese Knotweed look like? Typically Japanese Knotweed does not spread by seeds. Japanese knotweed does not spread via seed dispersion like other types of weed. The Spread of Japanese knotweed nationwide has been primarily via human contact. New knotweed plants quickly establish from the fragments. So, what does Japanese knotweed look like? Knotweed typically would be identified by its large green shovel-shaped leaves and bamboo-type stem. Only the female form of the plant is present in the UK and therefore, it cannot pollinate and produce any viable seed, other than hybridising with other similar knotweed species. However, knotweed is a dioecious plant, meaning both flowering females and fertilising males are required to produce viable seeds. A barrier may be needed as you can be held responsible if it encroaches onto their property. In winter the plant dies back to ground level but by early summer the bamboo-like stems emerge from rhizomes deep underground to shoot to over 2.1m (7ft), suppressing all other plant growth. It rapidly spreads, wiping out the native species in its relentless progress across the land and poses a serious threat to drains and building foundations. Japanese Knotweed is now abundant throughout the whole of the UK. Instead, it typically takes advantage of areas disturbed by humans—areas affording not only ample sunlight but also friable (or crumbly) soil for its invasive roots. Why does it spread so quickly? This means you should have a multifaceted approach to get rid of it from your garden and lawn. If it is knotweed, and you weren't told the property was affected by Japanese knotweed when you bought it, I'd like to hear from you because we can help. The Knotweed must be treated at the root and by cutting it down. What does Japanese knotweed look like? Even worse, this ornamental plant can spread quickly and thrive in any conditions. In most of the Japanese Knotweed compensation claims, we are dealing where the Japanese Knotweed has spread from commercial land, such as railways and construction sites, onto residential land. The issue that concerns most homeowners upon initially discovering Japanese knotweed … In addition, any cut or broken fragments of the root or stem will sprout to form new plants. Talk to your neighbours about the knotweed problem and any treatment you have planned. Japanese knotweed infestations can spread quickly, taking hold of vast areas as its large structure of roots take hold. According to Environet Japanese Knotweed is believed to cost the UK economy about £166 million annually in property devaluations and for treatment. Although Japanese knotweed produces flowers, the plants in Ireland are infertile, and cannot produce seed. But the plant takes on different forms through the year with different coloured leaves and flowers present at various times depending on the seasons. Japanese Knotweed is a highly invasive plant and is recognised as the most invasive species of plant in Britain today. However, there are some exceptions to this rule, such as if the plant has caused subsidence, or if it has spread from a neighbouring property. Japanese knotweed spreads as a result of the plants' stems, or rhizomes (underground roots) being moved and spread around. Japanese Knotweed Removal. Spread occurs through direct rhizome (root) growth and via new plant growth from leaf, stem and rhizome fragments of the parent plant: a new plant can grow from pieces of rhizome as small as 1cm. Even the smallest part of a Japanese knotweed plant can start new growth. Japanese Knotweed is extremely difficult to treat because the roots or rhizomes spread rapidly underground and can regenerate from tiny amounts of material. These plants then fragment and disperse throughout the floodplains and cobble bars. It tends to find a way around most conventional methods of weed control, so special care has to be taken to control or remove it properly before it spreads. How quickly does knotweed spread? Think of the plant as an iceberg, with a third of the plant above ground and two thirds under ground in the form of rhizomes, with an ability to spread. In Cornwall Japanese knotweed has become widespread. Legislation Because … If you winced at the term, ‘seed-bearing flowers’ you’ll be forgiven for thinking the wind brought the plant to your garden. Japanese knotweed How do invasive knotweeds spread? #3 Don’t allow Japanese knotweed to spread to neighbourhood properties. It is a dense, strong plant, obliterating anything that attempts to grow beneath it. This said, there are some people who prefer to go it alone and take on the plant with a DIY approach (more on this below). Japanese knotweed has extensive, deep roots called rhizomes. Having dealt with Japanese knotweed claims across the North West and the rest of England, we have seen a trend of houses depreciating in value by 20% on average, when buyers are looking for a cash sale without an insurance-backed guarantee. Despite the requirement on sellers to disclose the presence of knotweed on the Law Society's pre-contract enquiry form (TA6) we still hear of many cases of intentional concealment. Japanese knotweed is a perennial plant with distinctive branching, hollow, bamboo-like stems, covered in purple speckles, often reaching two to three metres high. It’s underground network of stems mean it is extremely difficult to remove completely, even by professionals, and a new plant can grow from a piece of stem no longer than a fingernail. Any movement of the Japanese knotweed rhizomes, even tiny fractions in the soil, can lead to it spreading. Knotweed can also germinate from seed, although this is less common. Japanese knotweed is a non-native invasive plant that was introduced from Asia as an ornamental plant. Stem cuttings from mowing, flails, or strimming can re-grow and establish new plants. In these cases, we have argued that the owner of the residential land has an actionable claim against the owner of the neighbouring land for damages. It isn’t illegal to allow Japanese knotweed to grow on your land, but allowing it to spread to any neighbouring public or private land could lead to a compensation claim being made against you. Since the plant can regenerate from the spread of cut fragments, we do not recommend strimming. How does Japanese Knotweed spread? There is one piece of good news: Japanese knotweed doesn't tend to invade forested areas. There are strict regulations which control its disposal. How does knotweed spread? The majority of Japanese knotweed has been spread by riverbank erosion, and by mans' activities, such as fly-tipping garden waste and moving contaminated soil. If spread, one tiny piece of Japanese Knotweed will grow into a new plant. It forms fertile hybrids with giant knotweed (Polygonum sachalininese). Any attempts to remove Knotweed should therefore be carried out by licensed professionals. Here are a few common techniques and useful tips on how to kill Japanese knotweed. What Conditions Does Japanese Knotweed Need To Grow? This is why Japanese knotweed is so invasive as it can spread incredibly easily and quickly. It originates from Asia and was introduced to the UK back in 1824 as an ornamental plant and also a source of cattle feed. If you cause Japanese knotweed to spread, by disposing of it incorrectly, you’re guilty of an offence under the Wildlife and Countryside Act 1981. Don’t worry, however, because you can achieve this task with a little patience, effort, and time. If you want to know what knotweed looks like then check out our Japanese knotweed is becoming an increasingly dreaded presence as homeowners become more aware of the damage that this highly invasive weed can cause to their properties. Knotweed spreads when roots and stems are moved by waterways, floods or in contaminated soil. A landowner’s obligations regarding Japanese knotweed are chiefly to ensure that the plant does not spread beyond the boundaries of their property. HOW DOES JAPANESE KNOTWEED AFFECT HOUSE PRICES? Japanese knotweed has a reputation for being incredibly persistent. So now we’re onto the $1million question: how to get rid of Japanese knotweed. Japanese knotweed, or Fallopia Japonica, was brought to Europe from Japan in the mid-19C by German-born botanist Phillipp von Siebold who found it growing on the sides of volcanoes. Japanese Knotweed can grow up to 10cm a day in summer and the rate it spreads at is often boosted by homeowners attempting to remove the plant themselves. How Does Japanese Knotweed Spread? However it can grow from STEMS, CROWNS & RHIZOMES: Rhizome fragments of 1cm (0.7g) can sprout a new plant. 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