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Weed Eradication Service

Eradication and Control of Invasive Weeds

Weeds can be difficult and disruptive for developers

The discovery of invasive plants such as Horsetail (Marestail), Poison Hemlock, Ragwort, Giant Hogweed, and Japanese Knotweed, on your development site can be disruptive, cause delays, and increase costs.

In particular, Japanese Knotweed is highly destructive and has the potential to push through tarmac, grow through cracked concrete and invade the insides of houses.

Japanese Knotweed can grow up to 2cm per day. Its rhizome or underground root system can extend up to 7m from the parent plant. It is highly persistent and just a small section of the rhizome (0.7g) can be enough to grow a new plant, meaning that any disruption may risk multiplying and spreading the problem throughout your site.

A development site infested with Japanese Knotweed holds an inherent risk of the plant being disturbed and thus spreading. Japanese Knotweed is covered by the Wildlife and Countryside Act 1981, and the Environmental Protection Act 1990 – both deem it to be controlled waste.  The recent Anti-Social Behaviour, Crime and Policing Act 2014 makes it an offence to cause the plant to spread.

James Blake Associates can offer an effective solution that is neither complex or expensive.  Our expert team will provide a detailed report featuring:

  • A plan of the site and the affected area/s
  • An appraisal of options
  • Recommendations based on our observations and your site requirements

Using DEFRA approved herbicides and wetting agents to cut through the plant’s waxy cuticle, successful eradication of Japanese Knotweed can be achieved remarkably quickly.  Depending on the maturity of the plant, this can sometimes be achieved after just one application.

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Japanese Knotweed