Japanese Knotweed is commonly viewed as a troublesome invasive species and have been a topic of discussion among property professionals, homeowners and prospective buyers.
The plant is resilient, perennial plant that resembles bamboo-like and can be found in many parts of the UK. Even a tiny fragment of its root, about the size of a fingernail, can develop into a new plant.
Japanese Knotweed has created significant issues in various environments, such as along roadsides, riverbanks, and abandoned lots, by outcompeting native vegetation and causing damage to structures. According to the Wildlife and Countryside Act 1981, it is illegal to intentionally plant or allow Japanese Knotweed to grow in the wild, and soil contaminated with this plant is designated as “controlled waste” under the Environmental Protection Act 1990.
Identifying Japanese Knotweed
- Green, spade-shaped leaves that feel waxy
- Bamboo-like stems that may have purple spots
- Tint white flowers that bloom in summer
- Fleshy orange centre in the roots when you look closely
How does it grow
Japanese Knotweed doesn’t produce seeds. Instead, it grows from cuttings of its stems, roots, or shoots. It stays dormant (inactive) until around March, then starts to grow. By summer, it can grow up to 3cm per day and reach heights of about 10 feet. Its roots can extend deeply, making it even harder to control. In the fall, the plant dies back, leaving brown stems until winter.
Managing Japanese Knotweed
If you find Japanese Knotweed on your property, it’s best not to try removing it on your own. It’s tough to eliminate, it can damage buildings, driveways, and other structures by growing through them. This invasive plant can spread rapidly through small pieces of rhizome or stem that may be carried by water or soil.
Under the Environmental Protection Act 1990 (EPA 1990), knotweed is categorised as ‘controlled waste’, meaning is must be disposed of by a registered waste carrier at a licensed facility.
If you currently own a property with Japanese Knotweed or are considering purchasing one, it’s crucial to be aware of the potential costs associated with its treatment or removal. Mortgage lenders typically require proof of an effective treatment plan to eliminate the plant as a prerequisite for lending.
Before Making a Purchase
Keep in mind that the existence of Japanese Knotweed or other invasive plants can influence a property’s value, and expenses for treatment or removal should be considered in your moving costs.
Japanese knotweed can be a serious issue for homeowners and property buyers in the UK. Knowing how to identify it and understanding the challenges it poses can help you take the right steps if you encounter this invasive plant.
At Chant Surveys, we can quickly identify Japanese Knotweed during our survey inspections. Contact us today for a free, no obligation quotation on 01245 601999.
