If you’ve ever heard of Japanese knotweed, then you probably already know that it’s never a good thing to find it growing on your property. There are several dangerous plants that grow in the UK, but is knotweed one of them?

There are many different ways in which a plant can be considered to be dangerous, so let’s break it down and answer the question is Japanese knotweed dangerous?

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Japanese knotweed is an invasive species that’s well known for its fast growth and its ability to reach heights over 6 ft tall – but what does it look like when its still growing?

This photo by Crouch, Swale is licensed under CC BY-SA 4.0

Many people can easily identify a fully grown knotweed plant by its distinctive large, heart shaped leaves and bamboo-like canes, but if you’ve found your way to this blog, you’re likely looking for advice on how to identify Japanese knotweed when it first appears.

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Fallopia japonica – that’s Japanese knotweed to you and me – is a well known invasive plant that’s known for its rapid growth speed and difficulty to remove. Japanese knotweed can cause multiple problems for property owners, including making a home difficult to sell, mortgage, and insure.

While there’s never a good time or place for Japanese knotweed to grow, that couldn’t be more true for the locals of Worcester where a rampant Japanese knotweed infestation has been allowed to grow unchecked, with its excessive growth being seen to reach heights of up to 6ft!

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In 2018, Jonathan Downing brought his dream house for £700,000 in South-West London. It was everything he dreamt it would be – that is, until he found Japanese knotweed growing behind his garden shed!

After an agreement could not be reached regarding the financing of the knotweed treatment, Jonathan Downing took Jeremy Henderson - the individual who sold him the house - to court. Following a 4-year long legal battle, legal fees were racked up, leaving Henderson left to pay £32,000 in damages, £95,000 for Downing’s legal fees, and almost £100,000 of his own legal fees.

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Japanese knotweed (fallopia japonica) is known for its extensive (and troublesome) rhizome system. Knotweed roots can expand up to seven feet below ground from a visible plant. If there is knotweed growing in close proximity to your property, its possible that the knotweed has already begun to make its way beneath your house.

If you’ve found your way to this blog, it’s possible that you’re already in this situation, and you’re wondering whether or not its possible that the knotweed will grow up into your house.

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