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Domestic Japanese Knotweed Services

Japanese Knotweed spring growth through concrete paving

Japanese knotweed spring growth through concrete paving.

Phlorum are vastly experienced at dealing with an array of Japanese Knotweed issues and provides a comprehensive list of bespoke domestic services including:

  • Japanese Knotweed Identification: Phlorum can assist with the identification of Japanese Knotweed without even having to visit your property. Please feel free to send us your photos and we will, free of charge, let you know if there is any knotweed is identifiable in them.
  • Japanese Knotweed Survey: Phlorum can provide a comprehensive survey to establish whether Japanese knotweed is present within your property. A detailed survey report will be provided, including options for the treatment or removal of Japanese knotweed if identified.
  • Removal of Japanese Knotweed: Phlorum offers specialist and bespoke removal of Japanese knotweed for home owners in the United Kingdom. For further information please call us.
  • Japanese Knotweed Disposal: Japanese knotweed material, including soils containing root fragments (known as rhizomes), fall under the classification of “controlled waste” and as such cannot be treated as normal garden waste. This is in order to stop the spread of Japanese knotweed as just a small fragment of rhizome can lead to new growth either elsewhere in your property or on neighbouring properties. Phlorum can manage the disposal of Japanese knotweed from your property to ensure that appropriate biosecurity measures are in place.
  • Herbicide Treatment of Knotweed: this can be carried out through the following methods:
    1. Herbicide Spraying: Most domestic Japanese knotweed infestations can be eradicated by herbicide spraying. This is the cheapest option but there are no quick-fix herbicide treatments; it will typically take several years (3-4 years, or occasionally longer, depending on the maturity and area covered by knotweed) to ensure complete eradication.
    2. Stem Injection: Using syringes or specially designed injector-guns, stem injection is another method of applying herbicide in a very focused area in order to prevent herbicides affecting plants close to the Japanese knotweed being treated. Researchers at the universities of Exeter and Swansea have separately tested this method and has have found it less effective than foliar applications using a spray. Stem injection can also be unnecessarily labour intensive and wasteful of undiluted herbicides. It should not, therefore, be a standard method for treating all Japanese knotweed infestations.
  • Japanese Knotweed Legal Advice: We are also experienced in acting as Expert Witnesses and providing Proofs of Evidence for situations where support on knotweed legal issues is needed. If you need a lawyer, we can also recommend suitably experienced and skilled solicitors who work in this specialist area.
  • Japanese Knotweed Mortgage Advice: We have significant experience in successfully assisting people who are seeking mortgage finance on properties affected by Japanese knotweed. Phlorum’s involvement with the Royal Institution of Chartered Surveyors (RICS) and the Property Care Association (PCA) Invasive Weed Control Group (IWCG) has largely helped to negate this problem. If you are trying to purchase or sell a property that is affected by Japanese knotweed, more information is available here (please link to new mortgage page). Alternatively please get in touch with one of our expert domestic knotweed consultants who will be happy to help.

Can I Treat Japanese Knotweed Myself?

There are chemicals, such as RoundUp™ with the active ingredient glyphosate, which are available at good garden centres and equivalent stores, but these are significantly weaker than the products available to licensed herbicide sprayers.
Considering the current legal liabilities and risks to property value that would otherwise be covered by the services and guarantees of a PCA IWCG member, attempting to deal with a knotweed infestation yourself could be considered foolhardy. However, if you decide to attempt eradicating Japanese knotweed yourself, and you are comfortable with the risks, then we offer the following advice:

  • Carefully follow and adhere to the instructions on the container of the herbicide you are going to use (this is a legal requirement);
  • Only use a herbicide that is appropriate for domestic use (licenses are required for professional applications);
  • Allow the knotweed to grow to at least 0.5m to 1m in height before applying herbicide;
  • Apply systemic herbicides only to the green tissues (glyphosate-based herbicides are non-residual and will be ineffective if applied to the ground);
  • Repeat the process, as necessary, during the growing season;
  • Repeat the process each growing season until you have had two years of no regrowth (likely to be several years);
  • Do not dispose of any Japanese knotweed material, or soils where the knotweed was growing, with your household rubbish (this could lead to the knotweed being spread, and your being prosecuted);
  • Do not compost any knotweed material (as there is a danger of spreading it);
  • Ensure that you clean any equipment/tools/shoes that have come into contact with Japanese knotweed material and associated soils (as there is a danger that growth could be spread);
  • If you are in any doubt about the risks of tackling Japanese knotweed on your own, then seek the guidance of an expert.

If you are unsure which Japanese knotweed treatment you require, please don’t hesitate to contact one of our expert consultants, who will offer advice based on your specific circumstances.