Japanese Knotweed Facts

With Japanese knotweed being such a disruptive and invasive plant that causes homeowners and business owners alike a great deal of problems when face-to-face with the weed, it’s only natural that many questions are asked regarding its appearance, how it comes to being on your property and more importantly, how to get rid of it. Take a look below to find all the answer to your most frequently asked questions and to learn some important Japanese knotweed facts!
What is Japanese knotweed?
Japanese knotweed is a fast-spreading, strong clump-forming perennial weed with tall, dense annual stems.
Where did Japanese knotweed come from?
Japanese knotweed originated from, you guessed it, Eastern Asia! From countries such as Japan, China and Korea.
How did Japanese knotweed get to the UK?
Japanese knotweed was brought to the UK as an ornamental plant in the early 19th century by German physician Phillipp Franz Balthasar van Siebild. Eventually spreading into the wild and becoming a mainstay within the British ecosystem.
What does Japanese knotweed look like?
Japanese knotweed can be identified by a number of features. During the spring, reddish-purple fleshy shoots appear from crimson-pink buds at ground level, which grow quickly, creating dense stands of tall bamboo-like canes which grow to 7 feet tall. Japanese knotweed leaves are shovel-shaped and grow up to 5 and a half inches long, with a zig-zag pattern along the stems.
Is Japanese knotweed poisonous?
Japanese knotweed is not poisonous and is harmless when touched, however, caution must be taken when in close proximity to avoid accidentally allowing the invasion to spread.
Can you eat Japanese knotweed?
Young Japanese knotweed shots are in fact edible, providing a fantastic source of vitamin A. It can be used in sauces, soups and desserts, offering a taste likened to rhubarb.
Does Japanese knotweed affect house prices?
As a result of Japanese knotweed’s ability to rapidly spread and cause a lot of problems, properties and homes affected by the invasive plant do run the risk of their value being impacted. Blocked drains and damage to foundations, walls and paths can all occur as a result of Japanese knotweed.
How do I prevent Japanese knotweed from spreading?
To prevent the spreading of Japanese knotweed, it is important that when discovered not to attempt to break or move stems or uproot the plant. Japanese knotweed spreads though fragments of cut stems and rhizomes which are capable of creating new shoots and roots when buried in soil. These fragments can be carried completely unnoticed; therefore, caution must be taken when dealing with Japanese knotweed.
How do I remove Japanese knotweed?
To remove Japanese knotweed, it is advised that trained and qualified specialist are called in to deal with any recognised infestation as the risk of the weed spreading is very high when not dealt with correctly. Many herbicides, when applied correctly, have the ability to kill Japanese knotweed also. For the best results, apply over sever years.
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