To permanently get rid of Japanese knotweed is not an easy task as the process necessitates one to have patience, and the application of multi-pronged methods to achieve full eradication of this highly invasive weed plant.

Owing to the rampant growth synonymous with the Japanese knotweed, successful removal is a difficult exercise, but it is achievable if one takes the right measures that have been tried, tested, and proved to work by experts across the board.

Consequently, this article’s subsequent segment will highlight the ways and means that an individual can put into use to permanently get rid of Japanese Knotweed.

Physical removal

First and foremost, take note that Japanese knotweed can grow to a height of 10 feet tall with the roots extending to nearly twice the same length, this imposing nature of the plant can become a menace if left unattended hence the need for physical removal, which can be achieved by:

  1. Cutting down and removing the Japanese knotweed canes, individuals are encouraged to use very sharp objects such as pruning shears which are basically specialized scissors for use on plants. When cutting, one must ensure that the process happens as close to the ground as possible. The next phase will be to ensure that all the cut pieces of the weed and fragments are completely cleared from the area to prevent any fresh growth. 
  2. Constant pruning/mowing – Albeit similar to cutting, mowing involves the use of tools to constantly prune the Japanese knotweed to small pieces now and then to control the growth levels. For mowing to effectively work, it has to be done every 7 days. The constant cutting impedes the quick growth of the weed plant. However, experts assert that mowing on its own may not eradicate the Japanese knotweed in its entirety, therefore; this method ought to be applied alongside other methods such as the use of commercial herbicides.
  3. Excavation of the Japanese knotweed – basically, this method involves the reliance on heavy machines that will help dig out the Japanese knotweed from the ground and its supplementary roots. Experts view excavation as a quick and effective way of Japanese knotweed removal; however, this method comes with its fair share of challenges; for instance, it is deemed expensive since one will need to hire or purchase the excavation machines where necessary. Additionally, excavation may lead to greater damages to the property or one’s yard because of the heavy digging involved. Finally, because machines often lack human precision, it is common to find that not all the plant fragments have been fully excavated, which poses a danger of the re-growth of the Japanese knotweed within the same area.
Learn how to permanently get rid of Japanese knotweed before it spreads uncontrollably
Learn how to permanently get rid of Japanese knotweed before it spreads uncontrollably

Use of herbicides/weed killers

The use of herbicides to permanently get rid of Japanese knotweed from your property is not only an affordable approach but also one that guarantees the best results if done properly. The recommendable herbicides for Japanese knotweed are those that contain glyphosate concentrate. This herbicide being non-restrictive means that any person can buy and use it. However, herbicides should never be used in a reckless manner hence; the following measures should be followed to the latter to permanently get rid of Japanese knotweed:

  1. Read and follow the instructions for usage – do not just assume you know how to use the herbicide at hand. Familiarize yourself with the ‘rulebook’ of herbicide manufacturers on how to effectively apply the chemical.
  2. Use the approved per cent active ingredient or in other words the correct dosage – using a less amount than the one described can only have a limited effect on the plant whereas using an excessive amount of the herbicide can only damage part of the plant and, thus not get the desired results. 
  3. Protective gear – always wear your gloves and protective mask when applying any herbicide.
  4. Due diligence – herbicides should never be used near water bodies as they may lead to contamination of the water. Take all the necessary steps to protect such parts before embarking on spraying the herbicide.
  5. Application method – this can either be direct spray to the weed plant or in some cases injection into the stem of the plant depending on the treatment plan guidelines.
  6. Duration time – one must wait for at least 7 days for the herbicides to target the root of the weed plant and destroy it before embarking on pulling the dead material. However, if you suspect that there is still the presence of the weed plant in an area that has been subjected to treatment; you can do another application until you permanently get rid of Japanese knotweed. 
Need to permanently get rid of Japanese knotweed is essential to reduce its spread and inevitable damage to property
Need to permanently get rid of Japanese knotweed is essential to reduce its spread and inevitable damage to property

Burning and burying

The waste remains of the cut and dug-out Japanese knotweed can still grow when left unattended. This makes it vital that the disposal of such remains becomes a necessity to permanently get rid of Japanese knotweed.

Disposal by way of burning involves the use of incineration equipment that will subject the remains to very hot temperatures such that nothing survives the process.

Experts advise that incineration should not be done in an open space as this may lead to emissions and worst-case scenario the remains may be blown away by the wind when not fully burned hence risking the possible risk of growth elsewhere.

The burnt remains must also be transported to an authorized land site that is licensed for final disposal.

Burying, on the other hand, can either be done in the area of removal of the weed plant; the reason being to avoid the possibility of transferring rhizomes to a different place and invoking a fresh growth or in a site that is approved for such a purpose.

The most important thing to note is that any waste material from the weed plant to be buried must never be mixed with any domestic waste as this may invoke fresh growth of the Japanese knotweed.

Secondly, the waste that remains to be buried must be put inside containers or plastic material that can be completely sealed. There should not be any room for escape if the rhizomes of the cut weed plants grow.

Contaminated area sealed off whilst Japanese knotweed treatment is underway
The contaminated area is sealed off whilst Japanese knotweed treatment is underway

Want to know more about how to permanently get rid of 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 about 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 –

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.
Bestseller 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
Weedol 011005 Pathclear Weedkiller Liquid Concentrate, 6 + 2 Tubes
  • Unique dual action fomulation, kills weeds to the root and prevents new weeds growing for up to 3 months
  • Ideal for paths, drives and patios
  • No measuring or mess - just add water
  • Creates an invisible barrier that prevents new weeds for up to 3 months
  • Children and pets need not be excluded from treated areas (once dry)
Bestseller No. 4
RootBlast - RootBlast 360 Glyphosate Home Garden Weedkiller - 1L Bottle with Integral Measuring Device Pair - Includes Pair Of gloves - 1L Makes Up to 50L
  • WEED KILLER CONCENTRATE: Rootblast's strong weed killer is both super-concentrated and tough on most broad leaf and grass weeds. It's specifically designed to bring you the best results by using systematic herbicide technology. It targets weeds from the inside and kills them at their underlying roots, preventing any future growth
  • GLYPHOSATE WEED KILLER: For optimal weed control, Rootblast have created a concentrate weed killer that contains 360g/l of glyphosate. Glyphosate is a broad-spectrum systemic herbicide and crop desiccant that is used by famers. It kills and destroys the weed without affecting the crop. By using glyphosate, Rootblast's weed killer is stronger and more effective than most other weed killers on the market
  • GLYPHOSATE HERBICIDE: This powerful and effective weed killer is designed to target weeds such as dandelion, grasses, docks, nettles, willowherb, bindweed, woody brambles, tree stumps, ivy and more. After applying Rootblast's heavy duty weed killer, the first signs of weed control are visible when the weed leaves yellow - this can take anywhere from a few days to up to 2-4 weeks. From this 1 litre bottle of glyphosate herbicide concentrate, you can make up 50 litres of product when it's diluted
  • DOCK, GRASS & DANDELION KILLER: Alongside this industrial strength weed killer, you'll receive a pair of protective gloves as well as the integral measuring device attached to the bottle. The gloves provide you with protection to ensure your experience is as easy and safe as possible. The integral measuring device is an inbuilt measuring cup, simply remove cap and carefully squeeze the container until the cup is full
  • TOTAL PROTECT WEED GARDEN SPRAY: This easy to use product is available as a ready to use tough, concentrated weed killer that comes with a integral measuring device attached and protective gloves. Use by professional garden and farmers, this product can tackle your weed problem and kill the weed from the root - the ultimate weed killer!
Bestseller No. 5
Rootblast Glyphosate Weedkiller 4 x 100ml Concentrate with 5L Pump Sprayer
  • For use on unwanted vegetation and areas not intended to bear vegetation
  • Contains 72 g/l glyphosate for effective control of annual and deep-rooted perennial garden weeds, including grasses*, docks, nettles, willowherb, dandelion and bindweed. Also suitable for woody brambles, tree stumps and Ivy.
  • Coverage up to 66sqm per sachet

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