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. Japanese knotweed has a reputation for being incredibly persistent. 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. Japanese Knotweed will grow absolutely anywhere, growing just as well in poor soil as it will in good soil. How does Japanese knotweed spread? How does it spread? Japanese Knotweed is best controlled sooner rather than later – if left unattended it will spread and become more difficult to control. Instead, the plant spreads by growth of its rhizomes and by fragmentation. How does Japanese knotweed spread? If you want to know what knotweed looks like then check out our Knotweed spreads when roots and stems are moved by waterways, floods or in contaminated soil. New knotweed plants quickly establish from the fragments. 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. 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. These plants then fragment and disperse throughout the floodplains and cobble bars. The plant also spreads through underground rhizomes, although spreading by seed has not been recorded in the UK. There is one piece of good news: Japanese knotweed doesn't tend to invade forested areas. Knotweed does not normally spread by seeds. Knotweed can also germinate from seed, although this is less common. 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. Knotweed spreads vegetatively by rhizomes and also sprouts from fragments of root and stem material, which are dispersed by water, equipment or in fill. 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. 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. Japanese knotweed spreads as a result of the plants' stems, or rhizomes (underground roots) being moved and spread around. The Knotweed must be treated at the root and by cutting it down. 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. In addition, any cut or broken fragments of the root or stem will sprout to form new plants. But the plant takes on different forms through the year with different coloured leaves and flowers present at various times depending on the seasons. However it can grow from STEMS, CROWNS & RHIZOMES: Rhizome fragments of 1cm (0.7g) can sprout a new plant. Japanese knotweed infestations can spread quickly, taking hold of vast areas as its large structure of roots take hold. But the weed soon spread like wildfire. What Does Japanese Knotweed Do? Legislation Because … You need to dispose it at a licensed landfill site. It originates from Asia and was introduced to the UK back in 1824 as an ornamental plant and also a source of cattle feed. Japanese knotweed How do invasive knotweeds spread? The Spread of Japanese knotweed nationwide has been primarily via human contact. Talk to your neighbours about the knotweed problem and any treatment you have planned. 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. A landowner’s obligations regarding Japanese knotweed are chiefly to ensure that the plant does not spread beyond the boundaries of their property. Japanese knotweed is a perennial plant with distinctive branching, hollow, bamboo-like stems, covered in purple speckles, often reaching two to three metres high. Lenders are cautious with properties that are affected by Japanese knotweed, but its not impossible to get a mortgage or re-mortgage. Why does it spread so quickly? Stem cuttings from mowing, flails, or strimming can re-grow and establish new plants. It forms fertile hybrids with giant knotweed (Polygonum sachalininese). If you winced at the term, ‘seed-bearing flowers’ you’ll be forgiven for thinking the wind brought the plant to your garden. What does Japanese Knotweed look like? It needs very little to grow and survive. So now we’re onto the $1million question: how to get rid of Japanese knotweed. Japanese Knotweed is extremely difficult to treat because the roots or rhizomes spread rapidly underground and can regenerate from tiny amounts of material. 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. It is a dense, strong plant, obliterating anything that attempts to grow beneath it. 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. 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. Knotweed typically would be identified by its large green shovel-shaped leaves and bamboo-type stem. Does house insurance cover Japanese Knotweed? 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 you cause Japanese knotweed to spread, by disposing of it incorrectly, you’re guilty of an offence under the Wildlife and Countryside Act 1981. So, what does Japanese knotweed look like? How quickly does knotweed spread? Japanese knotweed is a non-native invasive plant that was introduced from Asia as an ornamental plant. The Japanese Knotweed Key Legal Case – Williams and Waitsell v Network Rail. HOW DOES JAPANESE KNOTWEED AFFECT HOUSE PRICES? This i s a complex and challenging procedure best undertaken by a reputable and specialist company. These can be up to 3m (10 feet) deep and can extend out to 7m (23 feet) from the parent plant. Can Japanese knotweed affect mortgages. Mechanical flails and mowers will also spread the plant. Seasonal floods sweep plants into rivers and creeks. What does Japanese knotweed look like? 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. According to Environet Japanese Knotweed is believed to cost the UK economy about £166 million annually in property devaluations and for treatment. Crowns can withstand drying and composting to sprout new buds and new plants. 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. In Cornwall Japanese knotweed has become widespread. This isn’t to suggest that Japanese knotweed doesn’t damage buildings – it can and it does. 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. The problem with Japanese Knotweed is that it can sprout from as little as 2mm of rhizome, meaning it is classed as “controlled waste” under the Environmental Protection Act of 1990 and must only be disposed of into licensed landfill sites to stop further spread. This is much less than the 7 metres commonly cited as the risk zone. The Spruce / Jordan Provost. #4 Don’t do any DIY removal if you plan on selling your home . Most house insurance policies will not cover losses incurred as a result of Japanese Knotweed. It is a tenacious plant. Japanese knotweed does not spread via seed dispersion like other types of weed. What Conditions Does Japanese Knotweed Need To Grow? How does knotweed spread? Typically Japanese Knotweed does not spread by seeds. Japanese knotweed has extensive, deep roots called rhizomes. If it is given the right amount of space and nutrients, it is able to grow indefinitely. There are strict regulations which control its disposal. The issue that concerns most homeowners upon initially discovering Japanese knotweed … Japanese Knotweed is now abundant throughout the whole of the UK. Japanese Knotweed Removal. #3 Don’t allow Japanese knotweed to spread to neighbourhood properties. 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). It spreads through unintentional or deliberate movements of the plant’s chopped stems or fragments of the roots. A barrier may be needed as you can be held responsible if it encroaches onto their property. How Does Japanese Knotweed Spread? To see just how fast Japanese Knotweed spreads, here is a time-lapse video of Japanese Knotweed growth. No, As the Japanese knotweed in the UK is female only, the seeds produced are not viable and cannot cause spread. This is why Japanese knotweed is so invasive as it can spread incredibly easily and quickly. 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. If spread, one tiny piece of Japanese Knotweed will grow into a new plant. Eradication requires determination as it is very hard to remove by hand or eradicate with chemicals. How does Japanese Knotweed spread? 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. Even the smallest part of a Japanese knotweed plant can start new growth. 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. Here are a few common techniques and useful tips on how to kill Japanese knotweed. How does Japanese Knotweed spread? How does Japanese Knotweed Spread? Even worse, this ornamental plant can spread quickly and thrive in any conditions. How Does Japanese Knotweed Spread? The rhizomes can grow up to 7 m out from the parent plant and up to 3 m deep. Japanese Knotweed is a highly invasive plant and is recognised as the most invasive species of plant in Britain today. The plant flowers late in the season, August to October, with small creamy-white flowers hanging in clusters. Any attempts to remove Knotweed should therefore be carried out by licensed professionals. How far does Japanese knotweed spread? Don’t worry, however, because you can achieve this task with a little patience, effort, and time. However, knotweed is a dioecious plant, meaning both flowering females and fertilising males are required to produce viable seeds. 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. Although Japanese knotweed produces flowers, the plants in Ireland are infertile, and cannot produce seed. Any movement of the Japanese knotweed rhizomes, even tiny fractions in the soil, can lead to it spreading. 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. 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. This means you should have a multifaceted approach to get rid of it from your garden and lawn. 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