In an innovative effort to combat the spread of the highly invasive Japanese Knotweed along the M25 motorway, National Highways enlisted the assistance of three specially trained sniffer dogs. The dedicated canines, Fenix the Dutch Shepherd, and Spaniels Nica and Nettle, successfully detected and located the underground parts of the plant, including roots, bulbs, and shoots, which, when removed, prevent further growth and spread of this problematic species.

Japanese Knotweed is notorious for its aggressive growth and resilience, with the potential to reach heights of over 2.1 meters, stifling the growth of other plants in its vicinity. Not only can it pose serious problems to buildings and structures, but it is also an offence under the Wildlife and Countryside Act 1981 to allow this invasive plant to spread in the wild.

Owner and handler at Canine Detection Solutions, Kat Janczur, and her skilled sniffer dogs embarked on their mission along the M25. Due to the demanding nature of their work, each dog was limited to 30 minutes of detection before requiring an equal amount of rest to maintain their efficiency levels.

Kat emphasized the incredible olfactory abilities of the dogs, stating, “The dogs have got the most amazing sense of smell, and they can pick up the scent that Japanese knotweed rhizome gives off into the soil. They’re amazing animals and a great tool in efforts to prevent the spread of these invasive plants on and around the site.

On the second day of their operation, Kat and the dogs investigated the A3 northbound verge before proceeding to Seven Hills Road. During their diligent search, the dogs froze to alert their handler upon detecting Japanese Knotweed. This allowed National Highways to take prompt action to remove the plant and prevent further proliferation.

Notably, Japanese Knotweed can remain dormant for up to 20 years, making early detection crucial. Using detection dogs facilitated a comprehensive site clearance, regardless of the plant’s growth stage.

Pippa Jordan, explaining the unique approach, highlighted the importance of conservation in their construction projects. “Conservation plays an important role in our construction projects. Before we start, we create a map of the area, which shows nearby plant species, allowing us to tackle any invasive species growing on the construction site,” said Jordan. “In this case, we decided to put our paws on the pavement and take a unique approach to tackling the Japanese knotweed. These sniffer dogs are not only adorable but also incredibly skilled at detecting the presence of unwanted plants, especially those not readily visible.”

The efforts of these diligent sniffer dogs serve as a valuable tool in preserving the environment and preventing the proliferation of invasive species like Japanese Knotweed, contributing to the overall conservation efforts of National Highways.