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 Norfolk Broads. 

Eastern Daily Press: Japanese knotweed cases are on the rise in NorfolkJapanese knotweed cases are on the rise in Norfolk (Image: PA)

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

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Daniel Docking, a technical manager for the Property Care Association's Invasive Weed Control Group, said: "We can still expect late-season frosts and dry weather in March and April but Japanese knotweed has already started to establish itself.

Eastern Daily Press: There are currently 70 reported cases of Japanese knotweed within four kilometres of NorwichThere are currently 70 reported cases of Japanese knotweed within four kilometres of Norwich (Image: Environet UK)

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.

"Japanese knotweed will be largely unaffected by these changes, however, and that means it has more opportunities to spread and start to dominate environments."

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People in Norfolk are being urged to report any sightings of the plant to relevant authorities which include the Norfolk Non-native Species Initiative and the Broads Authority. 

Eastern Daily Press: Japanese knotweed can cause severe damage to homes if left uncheckedJapanese knotweed can cause severe damage to homes if left unchecked (Image: PA Archive/PA Images)

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.