Plants That Look Like Japanese Knotweed

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

The spread of Japanese Knotweed on your land or property can be very damaging. With the plants rapid spreading habits, the time taken to remove it can increase dramatically and be very expensive.

The United Kingdom has a number of other plants that can be confused with Japanese Knotweed. This article by CYB Environmental will list some of the most similar plants to aid you in identifying a real knotweed infection. We are a RICS regulated company that specialise in the removal of Japanese Knotweed. For enquiries and assessments, be sure to contact us, we can help you decide whether or not you have a knotweed infection. That being said, let’s get into plants that look like Japanese Knotweed.

The Biggest Offenders

  • Bindweed
  • Himalayan Knotweed
  • Himalayan Balsam
  • Broad-leaved Dock

 

Bindweed (Convolvulus Arvensis)

With Bindweeds heart shaped leaves, it would take a closer inspection to gage whether or not it is Japanese Knotweed. The leaves of Bindweed are also similar to Knotweed due to the alternate growth patterns along the stem. Bindweed can also cover a large area very quickly if left untamed. One of that most mistaken plant that looks like Japanese Knotweed.

As the name suggests, Bindweed is a climbing plant that has the ability to grow by twisting around other erect plants. That being said, it is unable to support its own weight and lacks the ability to grow straight up, unlike Japanese Knotweed. Large pink or white flowers also appear in early summer for Bindweed, also distinguishing it from Knotweed.

 

Himalayan Knotweed (Persicaria Wallichii)

When not in bloom, Himalayan Knotweed can look extremely similar to it’s Japanese counterpart due to the similar stems. Not only to the eye, but also to the touch as the stem on both plants is hollow.

Take a close look at the leaves, are they very narrow and half as wide as they are long? With the stem growing to around 1cm in diameter? If so, the plant you’re inspecting is likely to be Himalayan Knotweed. The flowers have a pink hue, rather than the pure white plants on Japanese Knotweed.

 

Himalayan Balsam (Impatiens Glandulifera)

Similar to Japanese Knotweed, Himalayan Balsam is a rapidly growing plant. It can quickly cover a large area and grow as tall as 2.5 Metres. It also has a hollow stem.

Begin by inspecting the stem, you will see the leaves grow opposite each other, rather than the alternating pattern of Japanese Knotweed. The leaves are also much longer and thinner too, with a pink midrib.

 

Broad-leaved Dock (Rumex Obtusifolius)

Part of the same family, so hardly surprising that it looks similar to knotweed, Broadleaved Dock has leaves arranged alternately along the stem as well. Its flowers and stems also form spikes just like knotweed.

Stems are fluted and shorter than knotweed plants, growing up to 1m in height. The stems are not completely hollow and contain a foam-like substance when snapped open.

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 info@cyb-environmental.com

japanese knotweed in summer and winter

How to spot Japanese Knotweed in Each Season

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

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 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

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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

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Are You Mistaking These Plants For Japanese Knotweed?

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

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 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 – Why Is It Such A Problem?

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

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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