Recent wet weather has allowed an invasive species of plant to thrive "well ahead" of its usual growing season, experts have warned.

Japanese knotweed is native to East Asia and was introduced to the UK in the 1800s where it has since spread out of control. 

It can grow up to four inches a day and forms dense thickets which can kill native plant species, making it particularly harmful to the flora of the region.

Now, according to experts, warm, wetter weather is providing a rich environment for Japanese knotweed to thrive across the North East.

And following one of the wettest Februarys on record and higher-than-average temperatures, the weed has seen a boom in reported sightings.

The Northern Echo: Japanese KnotweedJapanese Knotweed (Image: Property Care Association)

Reports have been coming in to the Property Care Association of early growth of the plants’ distinctive red stems in February, well ahead of its usual growing season - suggesting it is thriving across the region.

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.

He 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.”

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The plant's resilience will mean it is in a strong position to thrive even as the temperature drops again and other plants slow their growth.

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

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

“Our ICWG members have a range of options to treat infestations, so it’s essential to engage a competent Certificated Surveyors in Japanese knotweed (CSJK) who will have the specialist skills and knowledge to identify Japanese knotweed or any other invasive plants that may be present.”

The plant is identified by "distinctive" red stems and bamboo-like appearance. It can grow up to 8ft tall and its roots can reach as wide as 28ft.

Mr Docking added that if Japanese knotweed is found on private land, the landowner must take the necessary steps to prevent its further growth as defined by the law.

Tackling its spread costs the UK nearly £250 million a year, according to invasive plant specialists Environet, with an estimated 5pc of homes affected across the UK.