Can You Ever Truly Get Rid of Japanese Knotweed?

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Japanese knotweed, a notorious invasive plant, has earned its reputation as a garden nightmare. Its aggressive growth, extensive root system, and remarkable resilience make Japanese knotweed removal a daunting task. But while complete eradication requires dedication and strategic planning, achieving a knotweed-free future is definitely possible.

Why is Japanese Knotweed Removal So Difficult?

Deep and Expansive Root System

The primary roadblock to eliminating Japanese knotweed lies in its extensive root system. Rhizomes, underground stems, can spread horizontally for up to 7 meters and reach depths of 3 metres. Even tiny fragments left behind during Japanese knotweed removal can sprout new plants, making complete eradication a monumental task.

Resilience and Regrowth

This invasive species possesses an almost mythical ability to regenerate. Even seemingly dead fragments can revive under the right conditions, rendering DIY approaches with simple cutting or digging often ineffective.

Legal Obligations and Restrictions

Due to its invasive nature, Japanese knotweed removal falls under specific regulations in many countries. In the UK, for example, it’s classified as controlled waste, requiring specialised disposal methods to prevent further spread.

Methods for Tackling the Problem

Different Approaches, Varying Success Rates

Several methods exist for Japanese knotweed removal, each with its own advantages and limitations:


This traditional approach involves physically digging up the entire root system. While effective, it’s costly, disruptive, and requires expert knowledge to ensure complete removal. Additionally, soil disposal regulations add further complexity.

Herbicide Application

Licensed professionals apply glyphosate-based herbicides directly to the foliage, targeting the plant’s growth system. This method requires multiple applications over several years and proper disposal of contaminated soil.

Knotweed Suppression Techniques

Covering the affected area with tarpaulins or geotextiles aims to starve the plant of sunlight and prevent photosynthesis. This approach often serves as a complementary measure rather than a standalone solution.

A specialised weed control fabric can also be used to suppress the plant’s growth. However, it’s less effective than tarpaulin and may not prevent regrowth entirely.

Biological Control

Introducing plant-specific insects or fungi like the Aphalara itadori beetle can offer a more sustainable solution. However, effectiveness can be limited, and long-term monitoring is crucial. It must be implemented only under expert supervision.

A Tug Of War Between Eradication And Control

Effective Japanese knotweed removal needs a strategic and customised approach. For smaller Japanese knotweed infestations, non-chemical methods like digging or smothering might be enough. However, larger areas or those near structures and infrastructure demand professional intervention through excavation or herbicide application.

But while achieving complete eradication of Japanese knotweed is technically possible, it’s often a demanding and expensive process. In many cases, the goal shifts towards controlling the spread and minimising its impact. But how to know what is the best plan of action?

Hire CYB Environmental’s Japanese Knotweed Removal Experts

Given the complexities involved, it is highly recommended that you seek professional assistance from qualified Japanese knotweed removal specialists. Here are some more reasons to seek professional help from CYB Environmental.

●  Expertise and experience: Professionals possess the knowledge and equipment necessary for effective and safe removal, minimising the risk of regrowth and potential damage.

●  Compliance with regulations: Depending on your location, specific regulations may govern Japanese knotweed disposal. Professionals ensure proper handling and disposal of contaminated soil and plant material.

●  Peace of mind: Hiring qualified professionals offers a guarantee of proper treatment and long-term monitoring, ensuring complete eradication and protecting your property value.

Weeding Out

While achieving complete Japanese knotweed removal requires dedication and strategic planning, it’s not an insurmountable task. By understanding the plant’s characteristics, exploring the available removal methods, and seeking professional guidance, you can effectively tackle this tenacious foe and reclaim your garden’s beauty.

The key lies in early detection, professional expertise, and persistent effort. With the right approach, you can turn the tide against Japanese knotweed and enjoy a knotweed-free future.

What Are Some Early Detection Strategies for Japanese Knotweed Removal?

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Japanese knotweed (Fallopia japonica), also known as polygonum cuspidatum, is a non-native invasive plant that has become a significant ecological and economic threat in many regions worldwide. This aggressive perennial thrives in a variety of habitats, including riparian zones, roadsides, and wastelands, rapidly displacing native plants and disrupting natural ecosystems. Its extensive underground rhizome system, capable of extending up to 7 metres, allows it to spread quickly and form dense, impenetrable thickets.

The impact of Japanese knotweed extends beyond its ecological consequences. Its invasive growth can damage property, clog waterways, and hinder infrastructure development. Its presence can also reduce property values and negatively impact tourism.

Early Detection: The Key to Successful Eradication

Effectively managing Japanese knotweed requires a multi-pronged approach that emphasises early detection and control. Early detection is crucial for preventing the establishment and spread of knotweed populations, minimising its environmental and economic impact.

Identification: Recognizing the Invasive

Japanese knotweed is a distinguishable plant with several unique characteristics that aid in its identification. Its bamboo-like stems, hollow and jointed, can reach heights of up to 10 feet. The stems are typically green but may exhibit red or purple markings. The leaves are large, heart-shaped or spade-shaped, with serrated edges.

During late summer, Japanese knotweed produces clusters of small, creamy-white flowers that grow from the nodes along the stem. These flowers are a telltale sign of the plant’s presence. Also, engage the community in the effort to detect Japanese knotweed. Encourage residents to report suspected infestations to local authorities or environmental organisations for timely Japanese Knotweed removal.

Several surveillance methods can be employed:

● Visual Inspections: Regularly inspect areas where knotweed is known to exist or is likely to occur, such as along waterways, roadsides, and wastelands.

● Aerial Imagery: Utilise aerial imagery, such as Google Earth or other satellite imagery, to identify potential knotweed infestations.

● Community Engagement: Encourage community members to report any suspected knotweed sightings.

Preventing Japanese Knotweed Infestation

Once Japanese knotweed is detected, prompt action is necessary to prevent its establishment and spread. Early control measures focus on preventing the plant from producing seeds and disrupting its underground rhizome system.

Here are some preventive measures:

● Control Movement of Soil and Plant Material: Avoid transporting soil or plant material from areas known to be infested with Japanese knotweed.

● Proper Disposal of Infested Material: Dispose of infested soil and plant material properly to prevent the spread of rhizomes and seeds.

● Restore Native Vegetation: Restore native plant communities in areas previously occupied by Japanese knotweed to prevent re-infestation.

● Educate the Public: Raise awareness among landowners, residents, and stakeholders about the identification, risks, and control measures for Japanese knotweed.

● Cutting and Stem Removal: Cut down knotweed stems close to the ground to reduce seed production. After Japanese Knotweed removal, dispose of cut stems properly to prevent regrowth.

● Smothering: Smother knotweed by covering it with thick layers of mulch or heavy-duty plastic for an extended period. This deprives the plant of sunlight and nutrients, leading to its death.

● Herbicide Application: In some cases, herbicide application may be necessary to control knotweed effectively. Select herbicides specifically designed for knotweed control and follow all label instructions carefully.

Early Prevention is More Effective Than Japanese Knotweed Removal

Early detection and control of Japanese knotweed are crucial for minimising its impact on ecosystems, property, and infrastructure. By recognizing the plant’s distinctive characteristics, implementing regular surveillance, and employing appropriate control measures, we can effectively manage this invasive species and protect our natural environments.

japanese knotweed in summer

What are the RICS Updated Guidelines for Japanese Knotweed Treatment

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

Japanese knotweed (Reynoutria japonica) is an invasive, fast-growing weed that can cause damage to structures and property. It grows extremely quickly, penetrating cracks and joints as it spreads. Japanese knotweed can grow to depths of two metres and extend up to seven metres horizontally from the visible part of the plant.

It can also cause damage to buildings that are within seven metres of the above-ground portions of the plant. Plus, it can impact native plants in your garden by releasing chemicals that suppress plant growth and germination. Therefore, it is important to control its spread at the right time.

News RICS Guidelines for Japanese Knotweed Treatment

The Royal Institution of Chartered Surveyors (RICS) implemented an updated guidance note on Japanese knotweed in 2022. The RICS Management Category Assessment for Japanese knotweed now uses a decision tree to categorise infestations into four categories: A, B, C, and D, instead of the earlier RICS Risk Category.

These new management categories will help you assess how, sooner rather than later, you will need a Japanese Knotweed Treatment.

Management Category D

Management Category D applies when Japanese knotweed is off-site but within 3 metres of a property’s boundary. In this category, a specialist remediation contractor should advise on possible encroachment and appropriate management. Lending advice in this category is no mortgage retention except in exceptional circumstances.

A remediation specialist would only be brought in if there was a need for defensive action against neighbouring properties or to help instigate legal action against neighbouring properties.

Management Category C

Management Category C is considered “low impact” by the RICS. In this category, there’s no mortgage retention recommendation. The RICS recommends that the client seek specialist advice. In Management Category C, the knotweed is present but not causing damage or affecting amenity. The impact on value is lower because structures and amenity spaces have not been affected. Remedial costs are at the owner’s discretion.

A private homeowner may still want to seek help from a specialist company.

Management Category B

Management Category B is applied when Japanese knotweed is visible on-site, there is no visible damage to structures, and Japanese knotweed is likely to prevent use of or restrict access to amenity space. In this category, remediation from a specialist company is required, and an insurance-backed guarantee must cover work.

The cost of remediation will be related more directly to the value of the property because no structural repairs will be needed.

Management Category A

Management Category A is the most severe category. It applies when Japanese knotweed is on-site; it’s causing visible material damage to a significant structure; it’s within 3m of a habitable space; it’s likely to affect the value of the property because repair and remediation costs will be incurred. In this category, mortgage retention is advised pending a report from a specialist that highlights the appropriate action required. Lending advice is no mortgage until a specialist report is obtained and a suitable remedial plan is agreed upon.

Non-lending advice is to have a specialist remediation contractor advise appropriate action.

The RICS management categories for Japanese Knotweed Treatment provide a clear framework for assessing the severity of an infestation and determining whether a specialist contractor is needed. If you have Japanese knotweed on your property, it is important to have it assessed by a qualified professional to determine the best Japanese Knotweed Treatment for your needs.

Contact us today for more information!

Japanese knotweed management plan - Japanese knotweed on approperty

How to Create a Japanese Knotweed Management Plan?

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Japanese knotweed is quite invasive and significantly damages properties and infrastructures. So, it is important to have a Japanese knotweed management plan in place if you have an infestation on your property. This plan will outline the steps you will take to control and eradicate the plant.

How to Plan Japanese Knotweed Removal?

The following steps will help you to create a Japanese knotweed management plan:

Survey the Infestation

The first step in creating a Japanese knotweed management plan is to survey the infestation. This will involve identifying the extent of the infestation and the location of the knotweed. The survey should also include an assessment of the soil type and the intended use of the property.

Assess the Risks

Once the infestation has been surveyed, the next step is to assess the risk posed by the knotweed. This will involve considering factors such as the size of the infestation, the location, the soil type, and the intended use of the property.

Develop a Treatment Strategy

There are various ways to treat Japanese knotweed. The best approach will depend on the size and location of the infestation, as well as the budget available. Several methods can be used to control Japanese knotweed, including Physical removal, Chemical treatment, Biological control, and A combination of methods. The choice of treatment method will depend on the specific circumstances of the infestation.

Timeline and Budget

The management plan should also include a timeline for implementation and a budget. The timeline should be realistic and achievable, and the budget should be sufficient to cover the costs of treatment or removal. Even if you are doing it yourself, you’ll need to conduct the removal in a proper time frame to get effective results.

Implement the Treatment Strategy

Once you have a treatment strategy, you need to implement it. This may involve hiring a professional contractor or doing it yourself. Either way, essential safety equipment and tools must be used to avoid any accident.

Monitor the Results

It is important to monitor the results of the treatment to ensure that it is successful. This may involve regular inspections of the infested area, as we know that Japanese Knotweed tends to grow back.

Get a Professional Japanese Knotweed Management Plan

If you need help with how to create a Japanese knotweed management plan, getting professional advice from a qualified arborist or environmental consultant is a good idea. Professional Japanese knotweed removal companies have the expertise and experience to identify and remove the plant correctly.

The team at CYB Environmental will advise you on the best treatment method for your specific situation. We will also have the necessary safety equipment and procedures in place to protect you and your property. Moreover, in the long run, hiring a professional Japanese knotweed removal company like ours may be more cost-effective than trying to do it yourself. Contact us today!

Japanese knotweed removal

What are the Most Common Mistakes People Make with DIY Japanese Knotweed Removal?

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Japanese knotweed is an invasive species that can be incredibly difficult to remove. It has a fast-growing root system that can spread underground for metres, making it very difficult to eradicate. As a result, many people attempt to remove Japanese knotweed themselves, only to make matters worse.

Common Mistakes With DIY Japanese Knotweed Removal

Cutting the Plant

This is one of the most common mistakes people make. When you cut Japanese knotweed, you may kill the above-ground growth, but the roots will remain alive and eventually send up new shoots. In fact, cutting Japanese knotweed can worsen the problem, as it can stimulate the growth of new rhizomes.

Mowing the Plant

Mowing Japanese knotweed is just as ineffective as cutting it. The same principle applies: mowing will kill the above-ground growth, but the roots will remain alive and will eventually send up new shoots. Also, mowing can spread the plant’s rhizomes, worsening the problem.

Digging Up the Plant

This is another common mistake people make during Japanese knotweed removal. Japanese knotweed has a pervasive root system, and it isn’t easy to dig up all the roots. Even if you dig up most of the roots, there is always a chance that some will be left behind, which can lead to the re-growing plant.

Using the Wrong Herbicide

There are several herbicides that can be used to kill Japanese knotweed, but not all herbicides are created equal. Some herbicides are more effective than others, and some are more likely to damage surrounding plants. It is essential to choose a herbicide designed explicitly for Japanese knotweed and follow the label instructions carefully.

Wrong Application of Herbicide

Even if you use a suitable herbicide, it is essential to apply it correctly in order to be effective. The herbicide must be applied to the leaves of the plant when they are actively growing. Applying the herbicide to all the leaves, including those hidden from view, is also important.

Inconsistent Treatment

Japanese knotweed is a very resilient plant, and it may take multiple treatments with herbicides to kill it completely. It is important to treat the plant repeatedly, even after it appears to be dead.

If you are trying your hand at Japanese knotweed removal on your property, it is important to be aware of the mistakes that you might make. By avoiding these mistakes, you can increase your chances of success. However, it is important to remember that Japanese knotweed is a very difficult plant to remove, and even if you do everything correctly, it may take several years to eradicate it completely. If you need more confidence in your ability to remove Japanese knotweed yourself, it is best to hire a professional.

Other Things to Consider with Japanese Knotweed Removal

In addition to the mistakes listed above, there are a few other things to keep in mind when trying to remove Japanese knotweed yourself. First, it is important to wear protective clothing when working with Japanese knotweed. The plant contains sap that can irritate the skin and eyes. Second, it is important to dispose of Japanese knotweed properly. Do not compost it or put it in your regular garbage. Instead, please take it to a hazardous waste disposal facility.

At CYB Environmental, we offer Japanese knotweed removal services in London, Cardiff, and Bristol. We use a variety of methods to remove knotweed, including excavation, herbicide treatment, and thermal remediation. Plus, we also offer a 5-year warranty on our work. We will, therefore, be happy to help deal with the Japanese Knotweed infestation on your property, with little to no chance of its regrowth. Contact us to learn more about how we can help you.

Japanese knotweed removal and treatment access restriction notice

What are the Different Methods of Japanese Knotweed Removal?

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

Japanese knotweed was originally introduced to the UK as an ornamental plant in the 1850s. But today, it has become a fast-growing, invasive species that can significantly damage properties. Japanese knotweed removal is therefore essential to prevent the plant from spreading and causing further damage.

Its deep and extensive roots can spread rapidly, making it difficult to control. While the weed’s damage can extend to foundations, walls, and even pavements. The plant is so destructive that it is now classified as a “controlled weed” in the UK, meaning it is illegal to plant, trade, or transport it without a permit.

Japanese Knotweed Removal Methods By CYB Environmental


Japanese knotweed’s extensive root system often penetrates deep into the ground, necessitating comprehensive excavation to eradicate all traces. Although labour-intensive, this method guarantees a lasting solution and avoids the use of chemical herbicides, reducing environmental impacts. It stands as a reliable and effective method for Japanese knotweed removal, as it involves physically digging out the entire root system and rhizomes of the knotweed, ensuring eradication at its source.

Skilled professionals execute precise excavation to prevent unintentional spread, securing the surrounding environment. Post-excavation monitoring and follow-up maintenance are essential to ensure successful elimination, safeguarding against potential regrowth.

Chemical Control

Chemical control serves as a common and potent method for Japanese knotweed removal, as it harnesses targeted herbicides to suppress its growth. Specifically formulated chemicals are applied directly to the foliage or injected into the plant, effectively disrupting its biological processes. However, careful application is crucial to prevent unintended environmental harm.

This method can be more cost-effective and require less physical labour than excavation. Nevertheless, a comprehensive understanding of local regulations and best practices is essential to ensure responsible and sustainable application. Regular monitoring and follow-up treatments may be necessary to achieve successful, long-term eradication of the invasive species.

On-site Burial

On-site burial is a lesser-known method of Japanese knotweed removal, which involves excavating the infested soil and burying it at a significant depth within a containment area on-site. This approach isolates the invasive plant and its rhizomes, reducing the risk of spreading to other areas.

While it avoids the use of chemicals, this method demands careful handling and secure containment to prevent unintentional dispersal. On-site burial may be suitable for large-scale infestations where removal and transportation to off-site disposal facilities are impractical. Regular monitoring is essential to detect any potential regrowth and address it promptly for effective eradication.

What to Do if You Find Japanese Knotweed on Your Property

If you think you have Japanese knotweed on your property, getting a professional assessment as soon as possible is important. A professional Japanese knotweed removal team can identify the plant and recommend the best treatment method.

At CYB Environmental, we are trusted for treating and removing Japanese knotweed in the UK. With a head office in London and satellite offices in Bristol and Cardiff, we are conveniently located to service most of London, the South of England, and Wales. Our commitment ensures that we continue to provide a high-quality service, and accurately meet client objectives, whilst maintaining traditional values of honesty, integrity and professionalism. Get in touch with us today, and we will be happy to help!

Japanese knotweed identification in autumn, fully bloomed.

What Time of the Year Does Japanese Knotweed Grow?

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

Japanese knotweed is a fast-growing, clump-forming perennial plant with tall and dense stems. By exploiting the small openings in pipes or cracks in barriers such as concrete, the plant causes serious damage & sometimes even breaks apart these structures.

Known for its rapid growth, this invasive plant no wonder leaves homeowners worried for several reasons, including property damage, reduced house prices, and more. It is said to cost taxpayers millions of Pounds per year, and the situation only gets worse as the plant has continued to spread across more properties across the UK.

Japanese knotweed growth cycle

Understanding Japanese knotweed identification and the growth cycle is important to get the right treatment for it. Like most other plants, Japanese knotweed doesn’t grow throughout the year and has a seasonal life cycle that develops through different seasons in response to the varying environmental conditions.

Typically, knotweed is quite tall, up to 3m but may vary in height depending on the season. Besides, it has bamboo-like canes that grow in distinctive and dense clumps and spreads rapidly.

All these features give this invasive plant a distinctive appearance, making Japanese knotweed identification an easy task. However, it can sometimes be confused with plants, like Fallopia baldschuanica, Persicaria microcephala, and Leycesteria formosa.

Japanese knotweed identification and growth pattern in different seasons


April to May is the time when new season knotweed stems generate from the underground rhizome system of the plant, using energy stored within to stimulate rapid growth. Bud-like shoots that are red in colour appear first just a few millimetres high from the ground. With the rise in the weather temperature, the buds erupt and begin to grow as stems. In mature knotweed plants, the rate at which they typically grow is 12-18 cm a day. Emergent stems when 10-20 cm high may look like asparagus spears, but soon develop a distinctive appearance when branches and leaves unfurl.


Japanese knotweed identification is the easiest in summer as it is the peak growing season for the plant. By early summer, the stems of the plant reach full height which is typically 2.5-3 m high in mature plants and sometimes higher than that, especially in giant knotweed. By June to July, knotweed starts growing at the rate of several centimetres a day. The free-standing canes of the plant develop purplish speckling near the base and are covered by a dense canopy of foliage at the sides as well as above the stand. This dense canopy blocks the sunlight and stymies the knotweed growth below.


By late summer and early autumn, you see clusters of tiny cream-coloured flowers on the plant. The growth of knotweed usually slows down during this time of the year. The plant prepares for the winter season ahead by re-absorbing all the essential nutrients back into its underground rhizome system. This turns all the leaves as well as stems yellow and then brown as the parts of the plant above the ground die off.


Winter is the most difficult time of the year for Japanese knotweed identification since the plant dies off and enters the dormant phase during this season. But do not be fooled. Its rhizome system is present beneath the soil, all set to emerge again when spring returns and temperatures rise.

If you have any questions, please feel free to contact our Japanese knotweed management team at CYB Environmental, and we will be happy to help. You can also call us on 020 3005 8755 today!

getting a mortgage with Japanese knotweed - a house fully infested with this invasive plant

Getting a Mortgage with Japanese Knotweed: All there is to Know

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You might have heard horror stories about Japanese knotweed causing severe damage to properties across the UK, making selling them rather difficult. No wonder Japanese knotweed infestations have caused mortgage lenders to take a cautious approach when it comes to dealing with properties that are affected by this pesky plant.

Before understanding the extent to which Japanese knotweed affects mortgages and the extra measures to take before obtaining a mortgage with this invasive plant, let’s check out what it is and how it is a problem.

What is Japanese knotweed?

Japanese knotweed is a tall herbaceous perennial plant with big shovel-shaped green leaves, white flowers, and bamboo-looking stems. As it grows really fast in almost all types of soil, it quickly spreads while growing from the underground roots (also known as rhizomes). It is extremely difficult to get rid of these rhizomes as a new plant may quickly sprout from even a tiny fragment that’s left in the soil.

How does it affect your chances of getting a mortgage?

Japanese knotweed spreads so fast that it can overtake the garden on a property in no time, ruining them completely by strangling all other plants. The roots of this dangerous plant block the drains which can even damage the foundation if left untreated. As all this damage caused by knotweed is likely to affect a property’s value, getting a mortgage with it isn’t easy. The worst is when you think you have successfully killed it off; it may be laying dormant ready to sprout again.

Knotweed has been singled out by the government and also the Royal Institution of Chartered Surveyors as an invasive plant, which if allowed to grow unchallenged, may increase pre-existing structural damage to properties, and disrupt paving and tarmac surfaces.

How do mortgage lenders access Japanese knotweed’s risk?

Most mortgage lenders access the risk of knotweed based on the four categories listed below:
– The plant is on a neighbouring property which is over seven metres away from the actual property’s boundary.
– The plant is on a neighbouring property within seven metres of the actual property’s boundary.
– The plant is within a property’s boundary but is over seven metres away from a residential property.
– The plant is within seven metres of a property and causes serious damage to the outbuildings, boundary walls, paths, and drains. This will need immediate treatment from an expert.

How can you get a mortgage with Japanese knotweed?

Lately, many lenders across the UK have relaxed their policies concerning Japanese knotweed, though you may still find some who refuse to lend unless you prove that the infestation has been professionally treated. So, your first step to obtaining a mortgage with Japanese knotweed is to have a knotweed treatment plan in place.

In order to evaluate the property, lenders want a survey to be conducted that allows them to find out the extent to which the plant can damage your property, along with other potential risks. Depending on how severe the infestation is, the lender could charge you a higher rate of interest to compensate for the perceived threat to the plant. You may also be asked to make a higher deposit for the mortgage. So, be prepared for what’s ahead.

Thank you for reading our blog. If you are looking to get a mortgage with this invasive knotweed, make sure to get in touch with us at CYB Environmental. As experts, our management plan and 10-year insurance-backed guarantee will ensure that lenders reverse their initial refusal to lend. Call us on 020 3005 8755 or fill out our contact form today!


How to Identify the Early Signs of Japanese Knotweed

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

Like any kind of plant, Japanese knotweed has early signs of growth that allow you to identify the weed before it grows out of control. Japanese knotweed has been known to grow through walls, concrete and even tarmac, damaging the infrastructure of many homes across the UK. For this reason, it’s vital to identify Japanese knotweed in its early stages.

Here’s how you can stop Japanese knotweed in its tracks by looking out for key signs of growth.

Heart-shaped leaves

One of Japanese knotweed’s most prominent features is the heart-shaped (or shovel-shaped) leaves that dominate the plant. They are a vibrant green and can grow up to 20cm long, so aren’t hard to spot. The leaves will be staggered on the stem rather than clustered, giving them more opportunity to soak up sunlight, but will be curled up and dark in colour when the shoots first emerge.

Red shoots appearing

Once Japanese knotweed starts growing, you should be able to identify new red/purple shoots that are often compared to asparagus. These shoots can grow up to 10ft tall and will quickly develop into dense areas of bamboo-like stems during the spring. If you believe you have Japanese knotweed growing on your property and you attempt to cut these shoots down, you should notice a hollow interior. If the interior is solid, it’s likely the plant isn’t Japanese knotweed.

Buds form in early spring

Japanese knotweed growth occurs mainly between April and October, so you will see the appearance of flower buds from early spring onwards. Japanese knotweed buds are round in shape and tend to bloom between late summer and early autumn. The resulting flowers develop in small clusters and are cream/white in colour, creating thick foliage around the leaves and stems.

Quick growth

As one of the fastest-growing weeds in the UK, it’s been reported that Japanese knotweed has grown up to 10cm a day in the height of summer. If you’ve noticed a plant quickly spreading across your garden and even infiltrating other properties, then chances are you’re dealing with Japanese knotweed. The rapid root growth also increases its external appearance, with the plant reaching heights of up to 3 metres in 6 weeks.

Identifying Japanese knotweed with CYB

If you believe you’ve found Japanese knotweed on your property, you can contact CYB Environmental. We offer a free and quick identification that can help you confirm the presence of this weed, even in its early stages, before discussing removal. Currently, our Japanese knotweed solutions include:

– Chemical control
– Excavation of the roots
– On-site burial

We’ll inform you of the best removal method for your situation, helping to control the plant and remove Japanese knotweed from your property. Our services extend to customers across the UK, especially to those in Japanese knotweed hotspots. If you require Japanese knotweed removal don’t hesitate to get in touch with CYB Environmental, as failing to deal with this plant could lead to criminal charges.

Read more about the implications of leaving Japanese knotweed to grow in our blog and find out why it’s best to deal with Japanese knotweed as soon as possible.


How does Japanese Knotweed spread?

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

What is Japanese knotweed?

Japanese Knotweed, also known as Fallopia Japonica is a weed that has the potential to grow up to 20cm per day, causing devastating environmental problems. Not only this, but it can also ruin houses by destroying the exterior walls that surround the property. This can have devastating impacts on the value of the property and make it hard for buyers to get a mortgage. Japanese Knotweed was first brought into the UK in 1850- before it was known how damaging the plant can be and how rapidly it grows.

How does Japanese Knotweed spread?

It is rare that Japanese Knotweed produces seeds, but it does happen on occasion. You might be left wondering how the weed spreads so rapidly! Instead, Japanese Knotweed spreads through the nodes of green stem – water and soil is the perfect environment for the weed to grow! The dispersal of the rhizome fragments, stems and crowns make it easy for this plant to thrive under the UK’s climate. Despite being a huge problem in the UK, the weed isn’t as invasive in Japan as it propagates in a different manner. Taking the weed out of its natural habitat in 1850 was a big mistake as instead of spreading seeds like in Japan, it has learned to survive and spread through roots, stems and crowns.

Each of these infestive plants in the UK is supported by an underground system filled with stems, crowns and rhizomes which spread and send shoots to the surface. It doesn’t take much for a whole plant to grow like the weed can form a fully grown plant from a single rhizome as small as 10mm. This is why it is so important to dispose of Japanese Knotweed correctly, as it can so easily contaminate the ground by dumping it.

Where does Japanese Knotweed come from?

This weed does not simply just appear from nowhere. If you have spotted Japanese Knotweed on your premises, you can expect to find it in the surrounding areas. Try asking your neighbours if they have it in their garden, or have a look around your property to see if you can spot where the Japanese Knotweed is coming from. If you can not identify Japanese Knotweed nearby, there is a possibility that contaminated soil was dumped on your land, which could have been transferred via foot or on a car.

Can animals spread Japanese Knotweed?

Certain animals are able to spread Japanese Knotweed through their droppings. These animals include sheep, cattle and goats. It is unlikely that rhizome fragments will be the cause of new growth via droppings, however, their droppings could contain stems or canes. These can indeed survive the pass through the animals digestive system and form new growth when positioned back into the soil.

Where in the UK is contaminated?

It is to the point now where there are only a few places that the Japanese Knotweed hasn’t spread. A government-approved scheme has now been put into place to track the spread of the weed. The most contaminated areas are London, Birmingham, Leicester, Nottingham, Sheffield, Bristol, Cardiff, Swansea, Plymouth, Southampton, Brighton, Blackpool, Manchester, Leeds, York, Peterborough, Northampton, Southampton, Brighton and Newcastle.

How fast does Japanese Knotweed spread?

During the summer, Japanese Knotweed has been known to spread as much as 20cm per day. Although we know that it rapidly spreads above the ground, there has been no research conducted on what happens below the ground, yet we know that Japanese Knotweed can and does spread through its roots.

Thank you for reading our blog ‘How does Japanese Knotweed spread’. If you have spotted Japanese Knotweed and need to get it removed, we offer removal services with a 5-year warranty, take a look at our website today.