Yes, Japanese knotweed is dangerous as it spreads aggressively, outcompetes native plants, damages property foundations and infrastructure, and poses risks to both ecosystems and human health.
This invasive plant, scientifically known as Reynoutria japonica, spreads aggressively and can also cause serious problems for the environment, property, and even human health. Native to Japan, Korea, and China, it was introduced to Europe and North America in the 19th century and has since become one of the most damaging invasive species worldwide.
In addition to environmental and structural risks, the plant can also contribute to skin irritation for some individuals who come into contact with it. Because of these threats, Japanese knotweed is considered highly dangerous and is tightly controlled in many countries to prevent further spread.
In this blog, we will explore the reasons behind the danger of Japanese Knotweed and why it’s essential to take this plant seriously.
Spotting Japanese Knotweed
Identifying Japanese Knotweed (Reynoutria japonica) is crucial, as it may appear small and contained. This invasive plant can grow as tall as 2-3 metres and grow up to two metres deep, exploiting any structural weaknesses in buildings as it seeks water and light.
To spot Japanese knotweed look for its distinctive bamboo-like stems, heart-shaped leaves, and clusters of small white or cream flowers. Its rapid growth and resilience make it easily distinguishable, but its extensive root system is often hidden underground, ready to cause damage to nearby structures.
Finding Japanese Knotweed in Your Garden
If you find Japanese knotweed in your garden, it is vital to instantly control and remove the underground root. The first step is to call a professional Japanese knotweed removal expert, who can asses and identify Japanese knotweed to advise the best course of action.
How to Treat Japanese Knotweed
To treat Japanese knotweed, contact a Japanese knotweed removal specialists. They have the expertise to accurately identify and assess the extent of the infestation, ensuring compliance with legal obligations.
Japanese knotweed removal specialists such as ourselves at Knotweed Specialists UK employ appropriate methods, such as safe herbicide application, excavation, and disposal, minimising environmental impact and health risks. Their professional guidance not only guarantees successful management but also helps prevent reinfestation, safeguarding your property and the ecosystem.
The Damage Caused by Japanese Knotweed
Property Damage
One of the primary concerns associated with Japanese knotweed is its impact on the property. The plant has a strong root system that can grow up to three metres deep and seven metres wide, which can cause significant damage to building foundations, walls, and drainage systems.
Additionally, Japanese knotweed can grow through asphalt, concrete, and other hard surfaces, causing cracks and other types of damage. This can be especially problematic for homeowners, as it can be difficult and costly to repair.
Japanese Knotweed can also have a significant impact on property values, often causing home prices to drop. This invasive plant’s reputation for aggressive growth and its potential to damage buildings and foundations can deter potential buyers. Even if it’s effectively treated and removed, the mere presence of Japanese Knotweed can raise concerns, leading to reduced property values by up to 15% or more. Homeowners and sellers must address this issue proactively to maintain their property’s market worth.
Environmental Damage
Japanese knotweed is also a significant threat to the environment. The plant is highly invasive, meaning it can quickly take over an area and outcompete native plants. This can have a negative impact on local ecosystems, as it can reduce biodiversity and disrupt natural habitats.
Additionally, Japanese knotweed can cause soil erosion, as its root system can destabilise the soil and make it more susceptible to erosion. This can be especially problematic in areas with steep slopes or near bodies of water.
Human Health Concerns
While Japanese knotweed is not poisonous, there are still some potential health concerns associated with the plant. The plant’s sap contains a compound called oxalic acid, which can cause skin irritation and rashes in some people.
Additionally, some people may experience respiratory symptoms such as coughing and wheezing if they inhale Japanese knotweed pollen. However, these symptoms are relatively rare and are generally only a concern for people with pre-existing respiratory conditions.
Can You Touch Japanese Knotweed?
Yes, you can physically touch Japanese knotweed. However, it’s important to be cautious when handling this plant as it can be invasive and difficult to control.
It’s important to wear protective clothing such as gloves and long sleeves to avoid coming into contact with the plant’s sap, as this can cause skin irritation in some people, especially if they are sensitive to other plants in the same family (Polygonaceae).
It’s important to dispose of any plant material properly to prevent spreading the plant further. If you need to remove Japanese Knotweed from your property, it’s recommended to seek professional assistance.
Buying a House with Japanese Knotweed
Whilst the Royal Institute of Chartered Surveyors (RICS) states that it is not unwise to buy a house with Japanese knotweed, it does come with its risks and can cause serious structural damage, reducing property value by up to 15%.
According to GoCompare, home insurance providers do not cover issues related to Japanese knotweed, except in some cases legal expenses cover for legal claims initiated by the policyholder. Therefore, It’s crucial to identify Japanese knotweed early to ensure effective removal, as proactive management can mitigate potential damages and legal issues, safeguarding your property’s value and your financial well-being.
Selling a House with Japanese Knotweed
Selling a house with Japanese knotweed can be a challenging process, as severe infestations have, in rare cases, almost completely devalued properties. To prevent this, it’s essential to disclose the presence of knotweed when selling your property.
Conducting a Japanese knotweed survey before putting your home on the market is a crucial step to ensure transparency and compliance with legal requirements, safeguarding both the buyer and seller from potential legal issues.
Dealing with Japanese Knotweed
Japanese knotweed is a dangerous plant due to its invasive nature and ability to cause damage to buildings and other structures. It can also negatively impact the environment and ecosystem by outcompeting native plant species.
While Japanese knotweed is not directly toxic to humans or animals, it can cause skin irritation and be a nuisance to homeowners and gardeners. It is important to take precautions when handling the plant, such as wearing protective clothing and washing thoroughly after contact.
In many cases, it is recommended that Japanese knotweed is to be removed. This is because it’s an invasive weed that can cause damage to buildings, roads, and other infrastructure and disrupt natural ecosystems.
Although Japanese knotweed is not poisonous, the plant can also worsen seasonal allergies and be a serious problem for people with respiratory conditions.
Japanese Knotweed Removal Specialists
Our team of experts specialise in identifying, controlling, and treating Japanese Knotweed in Hampshire and other locations. With years of experience and specialised knowledge, we are equipped to handle even the most challenging knotweed infestations.
Our goal is to help you effectively and safely remove this invasive plant from your property, and prevent it from causing further damage to your property or neighbouring areas. Trust us to be your go-to experts for Japanese knotweed removal.
Don’t leave it unchecked before it’s too late. To stop Japanese Knotweed spreading, get in touch today to schedule a survey of your Japanese knotweed infestation
