If you have Japanese knotweed on your land or property (even if you do not reside there) you are responsible for controlling it.
Control could be via a herbicide management plan or eradication via excavation. Most importantly, it must NOT be allowed to spread – and that’s the full responsibility of the home or land owner1. Here are some key points regarding Japanese knotweed and legal responsibilities:
Identification: Japanese knotweed is the most common of the four invasive knotweed plant species in the UK. These include Japanese knotweed, Dwarf knotweed, Giant knotweed, and Bohemian (hybrid) Knotweed. You can find a description and photographs of Japanese knotweed on the Non-native Species Secretariat website.
Where It Grows: Knotweed can thrive in various soil conditions found in the UK, particularly in man-made habitats such as roadsides, waste grounds, railway embankments, and cuttings. It’s also commonly found along rivers and streams.
How It Spreads: Japanese knotweed spreads through direct rhizome (root) growth and new plant growth from the parent plant’s stem and rhizome fragments. A new plant can even grow from pieces of rhizome as small as 1 cm.
Legal Obligations:
- You do not legally have to remove Japanese knotweed from your land unless it is causing a nuisance.
- However, you can be prosecuted for causing it to spread into the wild.
- Landowners have a ‘Duty of Care’ to ensure knotweed does not spread from their land.
- If Japanese knotweed is causing a nuisance, there may be a civil liability.
Treatment Options:
- Do not attempt to treat knotweed yourself unless you have the appropriate skills and experience.
- Consider hiring companies that specialize in treating knotweed.
- Spraying or injecting the stems with approved herbicides can be an effective treatment to stop knotweed from spreading.
- Knotweed rhizome can remain dormant in the soil for many years and will regrow if disturbed or if the soil is relocated.
Remember, while you are not legally required to remove Japanese knotweed unless it’s causing a nuisance, responsible management is crucial to prevent its spread and ecological damage