South Wales Knotweed Removal Blog

Knotweed Management Swansea

Knotweed eradication Swansea

Japanese Knotweed Procedure and Removal in Swansea

Have you got, or do you think you could have Japanese Knotweed? This may lead to a great deal of stress and worry. Don’t lose heart! South Wales Knotweed Removal offer services through South Wales, which includes Swansea, for the identification, treatment methods and when necessary the removing of knotweed. If you need advice or to request a visit, be sure to phone on 01269 591651

Knotweed (Fallopia Japonica)

What exactly is Knotweed?

Knotweed is an intrusive weed which is a plant from the dock family and it typically has sheaths where the leaves join the stems.

Japanese Knotweed is known as a highly invasive plant which can mature swiftly, overtaking other plant life all around if it is left to its own devices. Knotweed is very hard to remove and its existence on or in close proximity to a building could have an impact on house sales, purchases and bring about unanticipated fees.

Knotweed incorporates a really extensive and extremely sturdy root system. The roots can grow up to 3 metres down in the earth and 7 metres wide and upwards. It grows rapidly, at a rate in excess of a metre each week. The roots can impact existing structures and make it difficult to build foundations and incorporate drain systems into the ground however it does not grow through solid concrete.

It is very difficult to eradicate 100 percent of the roots safely and effectively and when a small piece of its grass root isn’t thoroughly removed, it’s going to swiftly re-grow and spread.

Knotweed is known to focus on disadvantages, for instance, cracks in brickwork, and is persistent in growing through them if not eradicated.

Where did Japanese Knotweed originate from?

A Dutch doctor named Phillipe von Siebold came to the British Isles in the late 1840’s and began to sell Japanese Knotweed to botanical gardens and also society figures.

The History of Knotweed

By 1869 it became available for general sale in the united kingdom and farmers started to use it as feed for their animals. Through the late 19th century gardeners urged people to purchase and plant knotweed within their home gardens to create a touch of greenery. Little did they know the harmful results knotweed would have from their rapid growth and plant’s roots.

The issue of it becoming greatly brought to a house or public landscapes resulted in it dispersing speedily and growing in the wild. By the 1930’s the consequences and impact of knotweed began to be noticed and its reputation for being a wonderful evergreen plant promptly declined. Its invasive nature, roots and ability to propagate and establish fairly quickly were starting to show.

In the Wintertime knotweed perishes back to ground level however in early summer the bamboo-like stems emerge from rhizomes deep below the ground to shoot to around 7ft high, whilst suppressing all other plant development under and also over the surface.

The Wildlife and Country Act made it an offence to introduce Japanese Knotweed into wild places in 1981 and by 1998 a survey showed that the weed-covered a tremendous area of 99 hectares within the Swansea area alone.

In 2011 aphids were introduced in Swansea to try to eliminate the widespread knotweed however it did not have the result which was needed. An aphid is a small insect which feeds by sucking sap from plants; a blackfly or greenfly. Aphids reproduce speedily, at times producing live young without mating, and enormous numbers can cause extensive problems for everyday native and wildflowers.

Since this time, the government continues to be at a loss for a way to effectively handle knotweed in the UK, so there are now companies that focus on removing knotweed.

Are there any health benefits of Knotweed?

Many people believe there are a few health improvements from Japanese knotweed, which includes; its ability to reduce and treat cognitive disorders, boost heart wellbeing, lower your chance of many forms of cancer, reduce gastrointestinal problems, reduce blood pressure levels, maintain proper insulin levels, and many more.

Can you get a mortgage on a house with Knotweed?

It’s actually not impossible to get a mortgage on your premises with knotweed, having said that, banks are invariably very cautious due to its capability to disperse rapidly. Also, buyers and lenders are naturally sceptical when thinking about buying a property or home or land where knotweed is found.

Home Insurance and Cross-Boundary Issues

Insurance for a residence with knotweed can be incredibly problematic.

Most buildings insurance policies do not cover you for destruction due to knotweed. If your neighbour has knotweed and your house is impacted by it, most insurance providers could very well go after others for the expense of the destruction brought on to your home.

The hapless predicament of homeowners experiencing issues in advertising their house, because of a knotweed infestation on nearby territory has become significantly typical in recent times and it in most cases is categorised within the realms of risk category three to four. It could turn into a difficult scenario and has been the fundamental cause of acrimonious and prolonged neighbourhood disagreements.

Although there are regulations which may be pursued to encourage the landowner in which the contamination lies, into arranging restorative work, in truth the regulations is pretty weak and certainly wasn’t unveiled by the British government with the problem of Japanese Knotweed at the forefront.

In summary, we advise you to be very cautious if you’re planning on purchasing property or land in which knotweed is discovered. Costs to get rid of knotweed can escalate and the whole removal is not always certain due to its ability to propagate from one tiny root and its fast growing.

Knotweed Myths, Misconceptions and Facts

There are numerous misguided beliefs about the best way to eradicate Japanese Knotweed as well as what the most effective plan of action to adopt is. Putting salt, diesel, caustic soda, turpentine, fairy liquid on the plant or into the soil are just some of the common myths which appear to have gathered traction over the years.

The subsequent claims are NOT legitimate:

  • It’ll grow through solid concrete
  • It could destabilise foundations
  • It can cause structural damage
  • Knotweed damages buildings particularly when left to grow unhindered for a number of years
  • This unpleasant plant could have such a remarkable impact on buildings, foundations and cement

Essentially, if groundwork and building work has been performed to a good standard in the past, then knotweed is not going to grow ‘through solid concrete’, it won’t destabilise strong foundations, it does not trigger structural damage, it does not ‘damage buildings’ and it won’t have a spectacular effect on any ‘solid structure’. These claims are mistaken and in many cases, false.

The real truth about knotweed is that is a wild plant and yes it will grow and propagates quickly overtaking other plants and flowers around it.

About South Wales Knotweed

We are the local family-run, Invasive Weed Management company, offering a professional and dependable solution. We started in 2013 by Carwyn Templeton, a fully qualified Japanese Knotweed Certificated Surveyor (JKCS) through the Property Care Association.

We predominantly focus on getting rid of Japanese Knotweed (Fallopia Japonica), along with other intrusive plant species and ‘general nuisance weeds’ found in the United Kingdom. We provide our expert services for residential premises and land earmarked for real estate and business development.

Knotweed Law

There is lots of legislation covering the handling and disposal of Japanese Knotweed and we are industry experts in this region, always providing you with suggestions about the very best solution for your property or land.

Our knotweed treatment methods are recommended by the Environment Agency Codes of Practice and also the industry trade body/ The Property Care Association which can be tailored to accommodate you as the customer.

Our Knotweed Control and Removal Methods

There are several methods to control and remove knotweed and you should always use an expert and certified business who understand fully the mind- field of legal guidelines and methods that should be implemented.


Stem- injection is often a low impact way of removing and managing knotweed. It is used for smaller contaminations and is employed in the event the knotweed has established itself amongst other plant life that you don’t want to be removed as there is less chance of damaging surrounding plants and flowers. It can also be used in places that there is a watercourse due to it being a less risky approach to removal. The stem-injection procedure can be carried out in dry or inclement climate conditions and the soil needs to remain undisturbed following a treatment.

Foliar Application

Foliar Application is a spray technique of knotweed removal and management and it is employed when the treatment can be repeated over several of its growing seasons. The knotweed is sprayed with an approved herbicide and the process is executed 2 to 3 times in the first year depending on the size of the knotweed and then once in the following year. The procedure needs to be completed in dry weather conditions and the soil undisturbed in subsequent years.

Weed Wiping

The Weed wiping technique can be achieved in areas where there are other plants and flowers that you don’t want to be impacted, similar to the Stem- injection process. The knotweed foliage is wiped with a sponge or cloth soaked with a suitable herbicide that means only they are harmed.


Bund or stockpiling is a merged treatment of stem-injection or foliar application which is followed by excavation of the underground material and removal of the dirt to a different section of the site. The brand new shoots that emerge will be subjected to even more herbicide application. This technique of removal is quicker in comparison to the more commonly employed systems which are replicated on a yearly basis and when done properly it enables a developer to begin using the land more quickly.

Cell Burial/Root Barrier

Cell Burial or making use of a Root Barrier will avert the sizeable expenses of transporting the knotweed earth and waste to landfill, however, the site needs to be sufficient for the knotweed materials to be buried to a minimum depth or, if encapsulated inside a geomembrane, it can be buried nearer to the surface. Root barriers may be installed both vertically and horizontally and this strategy is utilised when there is a risk of cross-boundary contamination.

Excavation & Removal Off Site

Excavation & Removal of knotweed materials off-site is a legitimate and swift control solution. It has its advantages for development sites when done efficiently, even so, the significant logistical challenges of this method are challenging. There is a high-risk of the knotweed scattering and therefore leads to the safe movement of the materials to landfill being costly. There is a significant duty of care necessary under the Environmental Protection Act( EPA ) 1990 with this method of removal. We are happy to operate in a consultancy function as clerk of the works for using this method of management, providing specified conditions are satisfied with the landowner or developer. We normally advise that the Excavation & Removal process should only be used as an absolute last option.

All of these treatment and removal products and services are offered to homes, businesses and properties. We will consider a staggered payment schedule for any work that does not involve a 3rd party, and for customers who require proof of prepayment in full from the outset from their mortgage companies.

For additional information or if you have any questions about knotweed removal in Swansea, give us a call on 01269 591651 and one of our professional team will gladly assist.