Removing Japanese knotweed off your property by spraying chemical weed killer

Removing Japanese knotweed permanently can be a troublesome exercise which, if not carried out properly, can be an action in futility since this invasive ornamental plant has a ‘never die attitude’ that stimulates its quick growth where no permanent removal has been successful.

To this end, it is thus encouraged that only the tried, tested, and approved methods of permanently removing Japanese knotweed are put into use to get rid of the weed once and for all.

Significantly, experts have identified the use of herbicides (weed killers) and burning as the two most effective methods of removing Japanese knotweed permanently.

It is on this footing that the next segment of this article will take a step by step guide on the two methods to enable the reader to be well-learned on what to do.

Removing Japanese knotweed off your property is essential to avoid devaluing your property
Removing Japanese knotweed off your property is essential to avoid devaluing your property

The first two steps are of general application to either method; hence will be discussed generally as an eye-opener as to what to do before embarking on using a desirable method of your choosing. 

Identification and mapping

It is important to note that an infestation of the Japanese knotweed varies from one area to another based on its spread and the growth ratio. 

This is why any suspected growth of Japanese knotweed in an area should be identified immediately, and such an area mapped out before taking any action.

Here, efforts should be put in place to get details about the level of growth of the weed and the size of the land or property affected by the Japanese knotweed.

Cutting and removal  

Bearing in mind that the canes of the Japanese knotweed can grow to heights of 10 feet and further and the roots taking a similar extension downwards to the soil, cutting such canes is necessary if removing Japanese knotweed completely is to be achieved.

The rule of thumb is that cutting must be done as close to the ground as possible.

Removing Japanese knotweed with any of the suggested weed killers on the market
Removing Japanese knotweed with any of the suggested weed killers on the market

Use of Weed-Killer Method

Weed killers are commercial chemical compounds often used to eradicate troublesome weeds in various varieties. They can be readily purchased from recommended sellers across the globe or online shops, depending on their convenience.

To remove Japanese knotweed, some of the recommended weed killers to use include Glyphosate or Roundup Tree Stump. For you to get the best results from such weed killers, here is what must be done

  1. Strictly read and follow the instructions manual of using the specific weed killer purchased.
  2. Always ensure that at all times you wear protective gear, which includes hand gloves and face masks when using any weed killer.
  3. Do a risk assessment exercise around your area and note the people, things, or environmental problems resulting from using the weed killers. Such an assessment should help devise an action plan on how to avoid the effects of the sprays. For instance, in an area where there are many children, one can consult with the neighbours to have the children and pets kept out of the area meant for treatment.
  4.  When applying the weed killer, ensure that spraying is done directly to the cut areas of the Japanese knotweed. This should be done instantly after the cutting process without unreasonable delay.
  5. Avoid spraying close to any surrounding vegetation as weed killers are corrosive and could potentially destroy any plants they encounter.
  6. 7 days grace-period should be allowed between the time of spraying and pulling out the dead Japanese knotweed. The reason for allowing such a long time is to enable the weed killer to act to the weed roots so that removing Japanese knotweed becomes successful.
  7. Even after applying weed killers, you need to constantly mow any remaining Japanese knotweed as frequently as possible because this will weaken and possibly lead to its eradication.
  8. Re-application of weed killers is encouraged because the first time of application may not yield a complete removal of the weed unless ascertained. If possible, weed killers should be applied quarterly or twice within the same year, depending on the manifestation level.

Use of Burning Method

Burning as a method of removing Japanese knotweed has been hailed as one of the most effective approaches to eradicating the weed if done following the right steps. After the very first step of cutting the canes of the Japanese knotweed has happened, for a person intending to burn the invasive weed, the following steps should be taken:

  1. Complete drying of the canes and any fragments is meant to derive the weed of moisture.
  2. Use of an incinerator with high temperatures so that the weed is subjected to high heat to ensure no rhizome survives the process.
  3. Transportation and disposal – the burnt substance must be transported in enclosed containers to avoid any spillage along the way. Preferably, an authorized carrier should be contacted to do this. It is important to note that no other waste materials should be carried together with the burnt weed.
  4. The burnt substance of the remains of the Japanese knotweed must be disposed of in an authorized landfill site that has the capacity to do so. Such substances should not be dumped anywhere as this may pose the risk of having a re-growth.
Removing Japanese knotweed with professional gear
Removing Japanese knotweed with professional gear

Are There Any Other Methods Of Removing Japanese Knotweed Permanently?

The above-mentioned methods are not cast in stone because as the world evolves, there are always new, fresh and better ideas on how to solve any problematic matter within society.

To this end, there are other methods, such as the complete excavation of the Japanese knotweed using machines (excavators) to dig up the invasive weed together with its roots.

However, this method is deemed quite expensive as one may need to hire the excavators and pay for the weed disposal services that ought to follow immediately after the waste Japanese knotweed has dried.

Want to know more about removing Japanese Knotweed?

Knotweed Removal aims to provide the most up to date information, help and advice for YOU to make informed decisions. If you are unsure or uncertain on how to proceed, please reach out to us and we will gladly come back and advise you as best we can.

Governmental advice can be found here and the UK law covering the removal of Japanese Knotweed as stated under the Wildlife and Countryside Act 1981 can be found here.

The best means to contact us is via our email – knotweedremovaltips@gmail.com

Do not forget we have a library of blogs covering many areas relevant to Japanese Knotweed, our free downloadable How-to Guides and Product Reviews on the latest methods being employed to eradicate or remove Japanese Knotweed.

Knotweed Removal, UK

Bestseller No. 1
Bayer Garden 2 x Path, Patio & Drive Weed Killer & Watering Can Set - 3 x 8g Sachets per pack treats upto 75sqm - Kills Ground Elder, Nettles, Docks, Couch Grass & Japanese Knotweed.
  • This exclusive twin pack and 9L Watering Set is everything you need for clearing weeds from paths, patios and rives including areas of tarmac, concrete and block paving.
  • Kills tough weeds and their roots including: Ground Elder, Nettles, Docks, Couch Grass, Japanese Knotweed, Brambles, Bracken & Ivy.
  • Each box contains 3 x 8g Simple ready measured soluble doses and treats up to 75sqm. Apply at any time when weeds are showing green leaf and are actively growing.
  • Sold with our durable 9L or 2 gallon capacity galvanised steel watering can with removable brass rose. Colour cannot be guaranteed. Watering can will be randomly picked and despatched.
  • Keep children and pets away from treated areas until the spray has dried.
SaleBestseller No. 2
Roundup Tree Stump Weedkiller, Super Concentrate 250 ml
  • Kills ivy japanese knotweed, saplings, brambles and nettles to the root
  • Kills up to 16 tree stumps
  • Contains a reusable pipette for specialist treatment of japanese knotweed
  • Kills the roots so weeds don't come back
  • Degraded in the soil by micro organisms
Bestseller No. 3
Scotts Miracle-Gro Roundup Tree Stump and Root Killer 250 ml Liquid Concentrate Weedkiller
  • Liquid concentrate tree stump and tough weed killer
  • Kills most garden weeds and tree stumps with a single application
  • Children and pets need not be excluded from treated areas (once dry)
  • Fully degrades in soil by microbial action
  • Leaves no harmful residues to allow replanting
SaleBestseller No. 4
Tree Stump Killer Root Killer Prfessional Roundup Tree Stump & Root Killer 250ml
  • Roundup Tree Stump Weed Killer 250ml Tree Stump & Root Killer Up To 16 Stumps
  • Kills stumps, trees, brambles, nettles, deep rooted and woody weeds.
  • Kills Tough Weeds to the roots.
  • Kills up to 16 Stumps
  • Roundup stump killer is a non-selective, translocated weedkiller that is absorbed by leaves and freshly cut, woody surfaces and moves throughout the entire plant, above and below the ground, to control standing coniferous and deciduous trees, newly cut tree stumps, tree saplings, brambles, bracken, Nettles, Japanese knotweed and other tough and woody weeds.
Bestseller No. 5
Bayer Garden 2 x Path, Patio & Drive Weed Killer - 3 x 8g Sachets per pack treats upto 75sqm - Kills Ground Elder, Nettles, Docks, Couch Grass & Japanese Knotweed.
  • Ideal for clearing weeds from paths, patios and rives including areas of tarmac, concrete and block paving.
  • Kills tough weeds and their roots including: Ground Elder, Nettles, Docks, Couch Grass, Japanese Knotweed, Brambles, Bracken & Ivy.
  • Each box contains 3 x 8g Simple ready measured soluble doses and treats up to 75sqm.
  • Apply at any time when weeds are showing green leaf and are actively growing.
  • Keep children and pets away from treated areas until the spray has dried.

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