How Was Japanese Knotweed Introduced to the UK?

Why Was Japanese Knotweed Introduced to the UK?

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An Introduction To Japanese Knotweed

The scientific name for Japanese Knotweed is Fallopia Japonica, with other family derivatives by the names of Giant Knotweed and Himalayan Knotweed. Being a native plant from Japan, China and Taiwan, Japanese Knotweed was introduced to Britain by the Victorians in the 1800s as an ornamental garden plant. Known for its rigorous growth and rapid spreading, Japanese Knotweed can grow up to 2 metres in length, within a single season, with underground roots stretching for up to 7 metres. Japanese Knotweed is illegal to plant in the United Kingdom, but completely legal to have it growing within your own garden, or land. However, if the plant spreads to neighbouring houses or gardens, you may be liable for legal action being taken against you. Japanese Knotweed is treated as controlled waste and cannot be dumped in domestic green recycling bins, with only licensed landfill sites being able to take it.


Popularity In The Past

A German-born botanist by the name of Philipp von Siebold found Japanese Knotweed growing up the side of a volcano and decided to begin using it as an ornamental plant for residential gardens. The plant was celebrated for its beauty and potential use for feeding animals. In 1845, Japanese Knotweed began to be sold commercially by nurseries and studies showing how it was used during coal mining to stabilise loose soil.


Issues That Japanese Knotweed May Cause

With Japanese Knotweed being discovered growing up the sides of volcanoes, the destructive capabilities of the plant were completely unknown. With the erratic climate and constant deposits of ash covering the plant, it would be naturally kept in check, being able to solely survive due to its deep rooting capabilities. Here in the United Kingdom, we tend to not have volcanoes in our back gardens and with nothing to fight against, Japanese Knotweed can grow at an unchallenged rate and may have devastating consequences. It is possible for Japanese Knotweed to grow at up to 20cm per day and has the ability to break through a number of surfaces. These surfaces are some of the sturdiest and most common throughout society, such as concrete, tarmac and brick. It can overpower practically any other plants, swarming them and preventing access to light.


The Removal Of Japanese Knotweed

Removing Japanese Knotweed is a trickier job than simply digging up the plant. Any rhizomes, tiny fragments of stem or root can cause the plant to begin growing all over again. For the complete removal of Japanese Knotweed, contact our specialists at CYB Environmental on

japanese knotweed in summer and winter

How to spot Japanese Knotweed in Each Season

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Looking for some pointers for how to spot Japanese Knotweed? The appearance of Japanese Knotweed will change with the seasons, so it is important you know what to look out for depending on the time of year. As experts in eliminating the invasive weed, we have put together a season by season checklist for you to go through when attempting to identify the plant. 


If you suspect that you may have Knotweed growing on your property, whatever time of year it is, we do not recommend attempting to treat it yourself. Once you have identified it using the checklist below, call in a professional japanese knotweed removal service to avoid any further complications with your property or mortgage later down the line. Read More

Japanese Knotweed in winter

Does Japanese Knotweed Die in Winter?

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Japanese knotweed can play havoc in your garden during the summer months; it has similar traits to bamboo and can grow over seven feet tall. But when it comes to winter, the Fallopia Japonica, or Japanese knotweed, seems to die off. The canes lose their leaves and turn brown. Over the winter the canes will slowly decompose and the remains of the plant will litter the ground. The decomposing remains of Japanese knotweed on the ground will stop other plants from growing on that patch of soil. This plant is truly nasty, but don’t be fooled by its decomposing state. This is the perfect time to go about removing this weed, as the plant is in fact not dead but in a dormant state. It will be back bigger and better with new shoots starting again in spring.    Read More

japanese knotweed removal cardiff

Is Japanese Knotweed A Problem In Cardiff?

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The Problem of Japanese Knotweed in Cardiff, Wales


We are aware that Japanese Knotweed can be a frustrating issue for residents and businesses in Cardiff, Wales. When left undealt with, in summer time it’s rapid and aggressive growth can crack tarmac, block drains and cause structural damage to buildings. Things are made more complicated by the fact that without expert help, Japanese Knotweed is notoriously hard to get rid of. Fortunately though, help is at hand – CYB Environmental are Japanese Knotweed specialists operating in Cardiff and all around the South of Wales. Read More

japanese knotweed black and white - london bristol cardiff uk

Are You Mistaking These Plants For Japanese Knotweed?

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Japanese Knotweed is a notoriously invasive plant, so it is important that it is identified as early as possible, in order to mitigate the damage it can cause to your property. With professional consultation and removal, japanese knotweed problems can be dealt with. However, for this to happen, it needs to be correctly identified in the first place so the issue can be reported.

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japanese knotweed mortgage problems - london cardiff bristol

Japanese Knotweed and Mortgages – All You Need To Know

By | CYB Japanese Knotweed Removal & Management Blog | No Comments

If you have found this blog, chances are you will be struggling with Japanese Knotweed mortgage problems, whether you are a buyer or a seller. It can be a hugely worrying issue and understandably so. We have put together this guide to show you that getting a mortgage or selling a property with Japanese Knotweed is achievable. With the help of CYB Environmental, you will be able to resolve all your Japanese Knotweed mortgage issues.

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japanese knotweed removal in London, Cardiff & Bristol - cyb environmental

Japanese Knotweed – Why Is It Such A Problem?

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You may have heard worrying stories of Japanese knotweed devaluing properties or of people having mortgage struggles if they are either purchasing or selling a house with traces of the plant present. Japanese knotweed management can be a real struggle. Here is a short guide to the plant, which should answer at least some of your questions relating to Japanese knotweed.

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