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Knotweed Removal, Images, Information, Dangers & Solutions, Killing Japanese Knotweed

Updated on November 23, 2017

Knot Weed Identification - Click for larger image

How to remove and kill Japanese knotweed.

Japanese knot-weed is the most invasive vegetation of the 21st century. This invasive species of weed is a perennial species which can punch holes in concrete, through brick walls, ruin crops and gardens. Killing or getting rid of knot-weed is extremely difficult.

Mortgage lenders may refuse finance if a garden has a severe case of knot weed infestation. Gardening companies around the globe are fighting to keep this dreaded weed under control.

The plant can grow over a foot long every week under the right environmental conditions, and can aid subsidence, allow damp to enter homes, and damage drains.

Heights of knot weed can be 4m with bushes spreading across the ground like a fire in a straw barn.

What is Japanese Knot Weed ?

Japanese Knotweed was deliberately introduced around the globe as a fast growing shrub with many different uses.

Beekeepers use them to provide nectar when other plants have died due to cold. The shrubs can also be eaten as the taste is similar to rhubarb, but can be dangerous as it contains oxalic acids.

The plant has been used to treat certain medical conditions in Korea and also has a mild laxative effect.

Knot-weed is an extremely fast growing shrub with an extensive root system. The plant can survive severe winters and thrives better than most other plants in summer.

Introduced into the western hemisphere for its summer beauty, the plant has now been registered as invasive, and specialist knotweed control companies have been set up to get rid of this difficult plant.

Killing Knotweed

Killing Japanese knotweed can take many months or even years. The entire root system needs to be removed or destroyed to prevent the regrowth of this weed.

Each piece of root system that is left in the ground can sprout new plants over several weeks.

Weed killers need to contain GLYPHOSATE to kill the root system, even then, it will take a long time to rid an area of knot weed.

The specialist weed killer needs to penetrate the root system over a long period of time. Depending on the size of the infestation, it could take many years before the weed is killed off completely.

Knot weed is a hardy plant and determination and patience is required to remove this plant from any area unless the professional knot weed solutions companies are called.

Knot Weed Problems


Knotweed Removal Companies

Knotweed removal companies are regulated by government law.

The disposal of knotweed roots by private methods may be illegal in your area, the problems with this plant are so serious, and you may be fined if caught.

Garden companies which have a license to remove knotweed will tear your garden apart. They will use massive diggers to dig down several feet into the earth to rip out the roots which can be more than 6 inches in diameter.

They will load the buckets of earth into a sorter machine, this will sort out the topsoil from parts of the root system. The soil will be placed back into the ground and the roots will be taken away for destruction.

This process is quicker although more expensive. It may take several days to a couple of weeks to complete an area.

It is imperative for people wishing to build on land which has even the slightest sign of knot weed, to have this more expensive process to removing the weed done.

It will be much quicker allowing building work to proceed and will rid the entire area of this weed.

Tarmac Loses Battle To Knot Weed

Other Names For Knot Weed

Japanese knot weed is known by many different names such as Himalayan Fleece Vine, Monkey Weed, Hancock's Curse, Pea Shooters, Elephant Ears, and Donkey Rhubarb.

Because of its visual similarity with bamboo, it has also be known as Japanese, Mexican or American Bamboo. There are many other regional varieties of names and can sometimes be confused with Sorrel.

Some trials using sea water for knot weed eradication are being tested and have so far shown good results.

This would be a perfect solution for areas where the use of weed killers present agricultural or other problems.

The Natural Knot Weed Killer

Natural Knotweed Killer

As the Knot Weed roots can spread to over 30 feet from any visible foliage, it takes great determination to defeat these pretty, but very aggressively growing plants.

The Aphalara Itadori is an insect ( Psyllid ) which feasts on the sap from the Knotweed. Japan has introduced millions of these to help with their infestation problems, and now Britain is seeking permission to transport billions of these sap drinking insects into England in their bid to keep a control of the weed.

This will be the first time that a bio-control technique will have been used in this way.

Wasps have been bred and released in their millions to curb a white fly epidemic, but never has anything like this been done to curb the growth of a simple plant.

Free Links To:-

French Beans -The idiots guide to growing them at home

Red Palm Weevil - The invasive pest killing past trees.


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    • profile image


      7 years ago

      what is the difference between a knotweed and a regular plant

    • Esmeowl12 profile image

      Cindy A Johnson 

      7 years ago from Sevierville, TN

      Wow, this sounds as bad as Kudzu. Thanks for the info. I've never heard of Knot weed. Voted up and useful.


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