What is Japanese Knotweed and How to Identify It

Japanese knotweed is a highly invasive and destructive plant species that is native to Japan, China, and Korea. It was introduced to Europe and North America in the 19th century as an ornamental plant, but has since spread rapidly and is now considered a major ecological and economic threat. The plant is capable of growing up to 10cm per day and can reach heights of up to 3-4 meters.

Here are some key characteristics of Japanese knotweed to help spot it:

1. Appearance – Japanese knotweed has distinctive, bamboo-like stems that are green or reddish-brown in colour, with a series of raised nodes. The leaves are heart-shaped and bright green, and grow in a zigzag pattern up the stem.
2. Growth pattern – Japanese knotweed grows rapidly and can quickly take over an area, forming dense thickets that can crowd out other plant species. The plant dies back in the winter and reemerges in the spring, with new growth appearing from underground rhizomes.
3. Habitat – Japanese knotweed can grow in a wide range of habitats, including roadsides, riverbanks, gardens, and parks. It prefers moist, nutrient-rich soils and is often found near water sources.
4. Damage – Japanese knotweed is highly destructive to infrastructure and buildings, as its rhizomes can penetrate concrete and other materials, causing damage to foundations, pipes, and drainage systems. It is also a threat to biodiversity, as it can outcompete native plant species and reduce habitat quality for wildlife.

If you suspect that you have Japanese knotweed on your property, it is important to take action quickly to prevent further spread and damage. The plant is difficult to eradicate completely, and usually requires a combination of methods, including chemical treatment, excavation, and ongoing monitoring and maintenance. It is recommended to seek the advice of a qualified professional, such as a certified invasive species specialist or a qualified surveyor, who can help identify and manage the plant effectively.

Our RICS Home Survey Services

At Aspect Surveying we provide Level 2 Home Surveys (previously referred to as Homebuyer’s Reports), as well as Level 3 Building Surveys (previously referred to as structural surveys).

Both types of surveys are a valuable tool for homebuyers, as they provide an in-depth assessment of the property’s condition and help to identify any areas of concern that may need to be addressed before the purchase is completed. By understanding the condition of the property, homebuyers can make an informed decision and ensure that they are fully aware of any potential problems before they complete the purchase.

Contact us for more information if you’re looking for a Home Buyer Survey or a Building Survey for your new home.