Japanese knotweed is a highly invasive plant species that can cause serious damage to properties, leading to a decrease in house prices and legal issues
Many of us like to get out and enjoy our gardens, but a particular item outside could devalue our property. We are talking about Japanese knotweed.
The rapidly growing invasive plant – is notoriously hard to eliminate without professional assistance. This is because even the tiniest root can sprout a new flower.
Despite its appealing appearance, this aggressive species is capable of inflicting serious damage on properties, leading to plummeting house prices and legal headaches.
However, Bradley Mackenzie of chartered surveyors at Stokemont has looked into the impact of Japanese knotweed and how its presence can turn a dream home into a financial nightmare, reports the Express.
This is what homeowners can do to mitigate its effects.
Structural damage and legal liabilities
According to Bradley: “The plant’s extensive root system, known as rhizomes, can penetrate foundations, walls, and drains, leading to structural damage.
“This can result in costly repairs and reduce the appeal and integrity of the property.”
Meanwhile, that’s not all under the Wildlife and Countryside Act 1981, allowing Japanese knotweed to spread from your property to neighbouring land is a criminal offence in the UK.
This can lead to legal disputes and additional costs if not managed properly.
Mortgage and sale challenges
Many UK lenders are wary of properties with Japanese knotweed due to its potential to damage buildings and decrease property value.
The presence of Japanese knotweed often raises red flags for buyers, surveyors, and estate agents. The pro said: “Even if controlled, its historical presence can lower a property’s value due to the stigma associated with it.
“Some insurance companies may refuse coverage or charge higher premiums for properties affected by Japanese knotweed due to the risks it poses.
“If you are selling your property, you are legally obligated to disclose the presence of Japanese knotweed to potential buyers. Demonstrating that professional treatment is in place can help mitigate the negative impact on your property’s value.”
Managing and removing Japanese knotweed
Bradley added: “Some insurance companies may refuse coverage or charge higher premiums for properties affected by Japanese knotweed due to the risks it poses.
“If you are selling your property, you are legally obligated to disclose the presence of Japanese knotweed to potential buyers.
“Demonstrating that professional treatment is in place can help mitigate the negative impact on your property’s value.”
Bradley explained: “Japanese knotweed is a formidable foe in the UK property market, capable of wreaking havoc on property values with its invasive nature.
“Getting rid of it requires patience and a solid strategy.
“First, you want to tackle it with a systemic herbicide like glyphosate, applying it over a few seasons to reach the deep roots.
“It’s not a quick fix—you’ll need to stay on top of it.”
“For more serious infestations, sometimes excavation is necessary, where you dig out the roots and surrounding soil.
“This is more intense and can be costly, but sometimes it’s the only way to get to the bottom of the problem.
“Always follow up with regular checks to make sure it doesn’t come back, and be sure to handle any removed material properly to avoid spreading it further.”