Treatment and Removal
Japanese Knotweed Ltd. provide a range of options for knotweed treatment and removal. These include herbicide application and excavation.
The presence of Japanese knotweed can cause disruption to development projects and incur unbudgeted costs through treatment and site delays if not dealt with properly from the very start.
There are plenty of myths about Japanese knotweed such as you have to notify your local council, it can burn you, it’s poisonous and your house will be destroyed by it. The questions here represent what we’re most commonly asked.
Whilst the internet provides a plethora of solutions for getting rid of Japanese knotweed, there are only two methods of dealing with knotweed; herbicide treatment or excavation. Find out more about the methods to get rid of Japanese knotweed.
Japanese knotweed spreads as a result of the plants’ stems, or rhizomes (underground roots) being moved and spread around. 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. Trials have shown as little as 0.7 grams of rhizome material, which is smaller than your little fingernail can propagate into a new plant within 10 days.
No you are not obliged to report Japanese knotweed on your premises to the authorities. Find out more about Japanese Knotweed & the Law, here.
No, Japanese knotweed is not poisonous and does not cause burns. Some people get the name confused with Giant hogweed, which can cause burns or Common ragwort, which is poisonous. Both of these are also non-native invasive weeds.
No, it’s illegal to sell Japanese knotweed under the Wildlife & Countryside Act 1981. Additionally, under the same Act, it’s illegal to cause Japanese knotweed to grow in the wild or to allow Japanese knotweed to “escape” from your property into the wild. You can be fined up to £5,000 or sent to prison for up to two years if you flout these laws.
Yes, Japanese knotweed has seeds. However, as we only have the female form of the plant in the UK, it cannot pollinate and produce any viable seed, other than hybridising with other similar knotweed species.
Yes, Japanese knotweed shoots are edible but we do not recommend harvesting them due to their invasive nature and the risk of spreading which can lead to criminal prosecution. Note that it is illegal to transport Japanese knotweed without a Waste Carrier Licence.
You can but you must do this with extreme care. When the knotweed material has been excavated, cut the stems and leaves and leave it to dry before burning it, ideally without contact with the soil. The knotweed material must be burnt on site and not be burnt anywhere else as you could potentially carry a fine and in extreme cases, a custodial sentence. Bear in mind though, in its native area, Japanese knotweed grows on volcanic ash and around hot fumaroles. Check the local bylaws with regards to burning/bonfires.
This very much depends on the mortgage lender. Always check with them first. For most mortgage lenders they are happy to lend as long as there is a professional company in place to control the knotweed infestation. Make sure you instruct a reputable contractor like Japanese Knotweed Ltd who are Property Care Association accredited and can document all work being done. Find out more about Japanese knotweed and mortgages.
No. The herbicides we use are completely safe for your children and pets. The herbicide we use is safe when wet, but for precaution, we advise that pets and children are kept out of the treated area for approximately 1-2 hours following application until the herbicide has dried.
Yes, there are many reports of horses, cows and goats eating Japanese knotweed. Whilst goats can be used to control Japanese knotweed, they will not kill or eradicate an infestation of Japanese knotweed.
No, this would be illegal. Japanese knotweed is classed as “controlled waste” and needs to be cut down carefully and either burnt on-site or taken away to a licensed landfill site or incineration facility.
Yes but you must keep the knotweed waste on-site or dispose of it at a licensed landfill. Clean the mower before mowing other parts of the garden.
No, as this would likely lead to knotweed taking root growing in your compost heap.
No it can’t. Whilst the leaves drop off in the autumn/winter, they should not cause concern regarding the plant’s spread.
Japanese knotweed can be killed through excavation and various eradication methods. These often involve digging up the knotweed and removing it from the contaminated ground to a special landfill. In order to do this effectively the root-system needs to be fully mapped out so that all the contaminated ground is removed, if even a little bit of the roots are left, then Japanese knotweed can re-emerge. There are a lot of myths on the internet telling people how to kill Japanese knotweed. These range from mowing to using petrol! Japanese knotweed can’t be killed through DIY methods and it requires specialist skills, equipment and herbicides to control it.
Whether you encounter knotweed on a major building project or as part of a maintenance scheme, please ensure you follow these basic guidelines: