The spread of Japanese knotweed to different sites and throughout the UK is mainly a result of the plants crown and rhizome (underground vegetative stem matter) being translocated (moved and spread around). Only the female form of the plant is present in the UK and it therefore it cannot pollinate and produce any viable seed (other than hybridising with other similar knotweed species).
Movement of knotweed material from a site/property can be done accidentally or in ignorance in many ways, such as:
- Leaving soil deposits contaminated with knotweed on vehicle tracks, dumpers or in excavator buckets.
- Recycling soils contaminated with knotweed.
- Recycling aggregate (i.e. crushed concrete) contaminated with knotweed.
- Placing knotweed in green waste bins.
It can also be disposed of knowingly and illegally by way of fly-tipping.
Removal of knotweed material from a site is an offence under the Environmental Protection Act unless it is handled as controlled waste and transported by a licensed waste carrier and disposed at a specially licensed landfill facility.
Increase of fly-tipping
Chichester District Council recently reported that fly tipping in that area has risen by 60% in the last 12 months and Southampton City Council deal with nearly 3,000 reports of fly-tipping on public land each year.
Wastes which are difficult or costly to dispose of legally are usually what are found at fly-tipping sites. Undoubtedly this will be a mixture of difficult, household and industrial waste, but it may also contain Japanese knotweed. As fly-tipping increases the risk of fly-tipping containing knotweed will also increase.
Fly-tipping of Japanese knotweed
When surveying sites we often encounter fly-tipped wastes, which have Japanese knotweed growing out of them. Where we establish the knotweed was not originally present in the ground underlying the tipped waste we can be confident that it was introduced with the fly-tipped material.
Japanese knotweed can have harmful ecological effects when introduced into the countryside by outcompeting other native flora and fauna. It is an offence under the Wildlife and Countryside Act to introduce Japanese knotweed to the wild.
Cornwall council have reported that fly-tipping of green waste on road verges, lay-bys and waste ground has been a major cause of knotweed spread.
Cleaning up of fly-tipped Japanese knotweed
When we are called to site where Japanese Knotweed has been fly-tipped we work with the landowner to remove the problem. This may involve either burying the waste on-site or removing it to a specialist landfill.
Japanese Knotweed Ltd the UK's trusted Japanese knotweed treatment and remediation company with a proven track record in working successfully for local authorities, developers, construction companies and private landowners. Our highly knowledgeable and skilled staff provide a comprehensive service and are committed to providing the highest level of customer care.
We provide Surveys and Knotweed Management Plans, including for long term chemical treatment, guarantees and immediate excavation options. Our remedial methods are tailored to each site and provide sensible and efficient eradication solutions to meet all requirements.
If you suspect you have a Japanese knotweed problem, call us on 0333 2414 213 or email us at firstname.lastname@example.org. The sooner it’s treated, the easier it is to control and eradicate.Japanese knotweed material is difficult to dispose of off-site legally for a home owner. It often not practical or possible to have small amounts of waste collected and removed to landfill by a registered waste carrier.