Why Is Japanese Knotweed A Problem?

  • An Estimated £166m damage to the British Economy
  • There may be one infestation every 10sqm in the UK
  • Listed as one of the worlds top 100 worst invasive species
  • A piece of knotweed as small as 0.6g can result in new growth

The Lifecycle of Japanese Knotweed

Identified by its’ red buds emerging into new shoots. These shoots grow rapidly by as much as 10cm per day.

Shoots can reach 2-3m tall. Stalks look like bamboo with red and purple speckles on the leaves. Produces white flowers near the end of the season.

The flowers last until late Autumn until they drop. The leaves start to yellow, then turn brown and eventually fall off. Leaving hollow brown stems.

Hard to identify. Dead Stems above ground. Extensive and alive rhizome network under ground.

Japanese Knotweed Damage To Property

Experts estimate the cost to keep Japanese Knotweed under control could be adding +10% or more to construction and development projects.

Damage to land and buildings can be extensive, including the following:

  • Concrete
  • Tarmac
  • Drains
  • Patios
  • Foundations

Japanese Knotweed Hotspots UK

It is estimated that there is at least 1 infestation in every 1km2 in the United Kingdom.

Facts About Japanese Knotweed

  • In Spring, Japanese knotweed can reach 4-7cm
  • By Summer, it can grow up to 3m
  • You are liable if knotweed makes it onto your neighbours land.

Japanese Knotweed Legal Obligations

ASBOs require you to stop the spread of Japanese knotweed. Failure to do so will result in the following:

  1. For individuals, a fixed penalty notice of £100 or prosecution will be the first step.
  2. If convicted, a level 4 fine of £2,500 will be imposed.
  3. For organisations, the fine can be as much as £20,000.

Stay on the right side of the law with a professional survey

If you are looking to buy or sell a property, you will likely require a full Japanese Knotweed survey to determine the presence or absence of Japanese Knotweed within the property boundaries.

Request a Japanese Knotweed Survey

We can tell you if you definitely have Japanese Knotweed on your property, and recommend the best course of action.