Bolton is the UK’s Japanese Knotweed hotspot

Bolton in Lancashire is UK hotspot for Japanese Knotweed sightings, according to Environet.

The knotweed removal firm has been tracking sightings of the invasive weed around the UK and produced a heatmap of the areas with the highest number of cases within a 4 km radius.

It says that Bolton has 652 reported cases, followed by Bristol with 433 and Capel Garmon in Conwy, North Wales with 395.

Within London, Clapham Common is the worst-affected area with 192 cases.

Lenders normally require that a treatment plan is in place with an insurance-backed guarantee in order to agree mortgages on properties affected by knotweed. 

Environet claims that presence of the plant can dent a property’s value by around 10 per cent as buyers may be deterred even if a plan is in place.

Heatmap: red shows areas with highest number of knotweed sightings

The company’s founder and managing director Nic Seal says: “Japanese knotweed has become a major problem across the UK, with areas of industrial heritage such as Bolton and North Wales particularly badly affected.

“One theory is that land moved during mining and heavy industry helped knotweed to spread, while the practice of dumping ballast from ships in the nineteenth century could have allowed it to take hold in port cities such as Bristol.”

He adds: “Anyone thinking about buying a property in or around these hotspots would be wise to check the number of infestations in the proximity of their postcode and consider instructing a specialist to carry out a Japanese knotweed survey on the property to check for evidence of the plant.”

Top Japanese knotweed hotspots in each region of Great Britain

Region

Location

No. of infestations within 4km

North West

Bolton, Lancashire

652

South West

Bristol

433

Wales

Capel Garmon, Conwy

395

Yorks & Humber

Rotherham

318

East Midlands

Nottingham

220

London

Clapham Common

192

Scotland

Glasgow

128

West Midlands

Madeley, Shropshire

89

South East

Shanklin, Isle of Wight

82

East

Norwich

72

North West

Newcastle

39

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