Japanese knotweed

Facts about Japanese knotweed

July 12, 2019 1:22 pm Published by

If you are looking for a commercial property to set up your new business, you might wonder what could threaten your project.

Japanese Knotweed is one thing that needs to be taken into account if your property includes even the smallest patch of garden.

We have created this fact sheet to help you:

  1. Technical information:

    1. Latin name: Fallopia japonicaidatum.
    2. Origin: native to East Asia in Japan, China and Korea.
    3. Introduction in the UK: It was introduced to Britain by the Victorians in the 1800s as an ornamental garden plant.
  2. Growth rate:

    1. 10-20cm a day.
    2. It spreads rapidly.
    3. It’s extremely difficult to kill.
  3. Risks:

    1. Japanese Knotweed prevents other plants from growing
    2. It grows through asphalt, destroys walls and underground drains.
    3. Lenders might not give you a mortgage if the survey reveals that the property you want is at risk of Japanese knotweed.
  4. Identification:

    1. In spring: reddish/purple shoots appear from the ground and fat, asparagus-like ‘spears’ rapidly lengthen from bright pink ‘crown’ buds.
    2. Lots of videos are available to help, here is one.
  5. Next steps

    1. If a surveyor finds it, they will recommend you to find a specialist to measure the extent of the invasion. The existence of Japanese knotweed on the property, or any land nearby, should be reported to the mortgage company before exchange of contracts. Each lender has their own policy on the matter.
    2. Although it grows rapidly, you can treat and prevent the spread of Japanese knotweed with a chemical called Glyphosate or by digging out the growth.
    3. Other Resources:
      1. Prevent Japanese knotweed from spreading guidance.
      2. Forum on Twitter.

If you are concerned, the first thing to do is to get a specialist in as soon as possible.

Please contact us if we can help you any further or if you have comments or questions. Our telephone number is 0808 169 8881.

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This post was written by Marketing Team