Japanese knotweed: reports of early growth of invasive plant

Reports have been coming in to the Property Care Association of early growth of the invasive plant's distinctive red stems in February, well ahead of its usual growing season.

Japanese knotweed is a rapidly growing plant responsible for damaging homes, pavements and drains. It can spread up to seven metres horizontally.

According to Daniel Docking, the PCA’s Invasive Weed Control Group technical manager, the current climate conditions could have a detrimental impact on native plant species.

Daniel Docking -Technical Manager -PCA (Image: PCA)

Mr Docking said: “We can still expect late-season frosts and dry weather in March and April, but Japanese knotweed has already started to establish itself and the resilience of the plant will mean it is in a strong position to thrive.

“At the moment many plants are doing well due to the weather conditions, including native species.

“But we’d still suspect the temperature to drop, meaning many plants will slow down their growth pattern.

“However, Japanese knotweed will be largely unaffected by these changes and that means it can start to dominate environments, with more opportunities to spread.”

The invasive plant has began growing earlier than usual this year (Image: Property Care Association)

The PCA’s Invasive Weed Control Group (ICWG) is a collective group of industry professionals, which provides clear guidance on best practices and standards, as well as being a reference point for property professionals and helping homeowners to find reliable, competent and trustworthy invasive weed contractors.

Daniel Docking added: “As Japanese knotweed becomes more visible, we encourage anyone with concerns about the plant to seek expert help.

“Advice sought quickly will help to control and manage the situation effectively.

“Japanese knotweed is tied to legislation, which means landowners have a responsibility to manage infestations responsibly."

As Japanese knotweed has begun to appear around Dorset, invasive plant specialist Environet has analysed the latest data from its live online tracker to reveal this year’s Japanese knotweed hotspots.

Infestations: 

Dorchester - 28

Bridport - 9

Lyme Regis - 30

Weymouth - 22

Wareham - 9

Hotspots of Japanese Knotweed across Dorset (Image: Environet UK)

More details about the PCA’s Invasive Weed Control Group can be found at https://www.property-care.org/homeowners/invasive-weed-control/