Close up of Japanese Knotweed with leaves and flowers

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Japanese Knotweed

Japanese knotweed (Fallopia japonica) is a fast-growing, aggressive weed that is regarded as the most invasive plant species in the UK. The reason Japanese knotweed has become so notorious is that it has the potential to cause real damage to homes and commercial properties and this, in turn, has led to several mortgage providers refusing to lend on affected properties.

Rentokil have assembled a team of qualified and experienced surveyors and technicians to form Rentokil Knotweed UK - a division of Rentokil Property Care dedicated to treating Japanese knotweed problems for homeowners and commercial clients with the care, expertise and quality of service expected from Rentokil.

If you need professional help with Japanese knotweed call us today on 0800 0121 437 or fill in our contact form to enquire about a survey online. Alternatively, continue reading this page to find out more about Japanese knotweed and how Rentokil Knotweed UK go about treating it.

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Japanese Knotweed Identification

Japanese knotweed was brought to our shores from Japan in Victorian times because it is an attractive plant with large green leaves and pretty white flowers. Despite this, it is not a plant you would want in your garden due to its rapid growth and ability to grow through the foundations of buildings causing structural damage.

Japanese knotweed can be identified by recognising its changing appearance throughout the seasons.

  • Spring: Japanese knotweed initially show as rapidly growing sprouts that look like thick asparagus.
  • Summer: By summer Japanese knotweed can grow up to 2-3m in height with dense foliage and white flowers
  • Autumn: The knotweed will maintain its height but the leafs will begin to wilt and turn yellow.
  • Winter: With the leaves now completely gone the Knoweed will leave a dense patch of brown canes.

Japanese Knotweed Damage

Due to the rapid growth of Japanese knotweed it can cause damage to building foundations and substructures by squeezing through cracks in masonry and making existing damage far worse. Typical Japanese knotweed damage includes:

  • Cracks in tarmac and paving
  • Structural damage to foundations
  • Damage to earth retaining walls
  • Reduced property values

Despite the potential damage that knotweed can cause, some banks and building societies will approve mortgages on affected properties if the knotweed problem is being treated by a trade-body approved contractor like Rentokil Knotweed UK that will issue a guarantee.

How to Get Rid of Japanese Knotweed

Getting rid of Japanese Knotweed is a bit of a misnomer as most of the time the process of treating Japanese knotweed involves several rounds of chemical treatments over a few growing seasons. It can take up to 5 years to completely finish a course of treatment.

However, with a guaranteed treatment plan in place you can avoid any Japanese damage to your property and its value. If you want to speak to an expert about the best course of action for your knotweed problem call us on 0800 0121 437 or click the button below to fill in an online form.

Japanese Knotweed Treatment

The use of chemical herbicides is the most suitable and cost-effective Japanese knotweed treatment option for the majority of properties.
Using a mixture of herbicide application techniques Rentokil knotweed UK technicians can attack the dense Japanese knotweed foliage and the subterranean root system that can grow for several meters.

  • Herbicide Spray - Spraying herbicide onto knotweed foliage with an accurate back-pack and nozzle system allows our technicians to make sure that only Japanese knotweed is killed.

  • Stem Injection - Stem injection involves using an injection gun to deliver a set dose of herbicide directly into the hollow stem of the plant allowing it to permeate down into the root system.

  • Leaf Sponging - Despite the best efforts and tools available, there may be times where spraying herbicide will inevitably affect the surrounding ecosystem. In this instance our technicians can simply sponge the herbicide onto the Japanese knotweed leaves and stems.

How Long Does Japanese Knotweed Treatment Take?

As mentioned above, Japanese Knotweed treatment with herbicide can take up to four or five growing seasons depending on the extent of the growth. After a professional Japanese knotweed survey our expert team should be able to give you an accurate estimate of the time it will take to completely treat the Japanese knotweed problem.

Even if you are trying to sell your property, the length of time the treatment takes should not affect the sale. Due to our Japanese knotweed treatment being guaranteed many lenders will allow you sell your property before the treatment is finished.

It is important to stress that this is the only way to effectively treat Japanese knotweed for most properties. Digging up Japanese knotweed requires a full site excavation with plant machinery. This means Japanese knotweed cannot simply be dug up with spades, cut back with shears or chemically killed in one go. 

Contact Rentokil Knotweed UK

Before proceeding with any Japanese knotweed treatment, we would always recommend having your Japanese knotweed problem assessed by a qualified Invasive weed surveyor.

If you suspect you have Japanese knotweed on your property, contact Rentokil Knotweed UK today on 0800 0121 437 to book a survey appointment. Alternatively, click the button below to contact us online.