The borough has been named the number one hotspot for Japanese knotweed in Greater Manchester with a staggering 1,494 recorded infestations
Japanese Knotweed (Image: Getty Images) The findings come from new data released by invasive plant specialists Environet UK, who are urging homeowners to remain vigilant as the fast-growing weed enters its peak summer season.
Figures highlight Bolton as the region’s number one hotspot, accounting for more than 40 per cent of all known cases across Greater Manchester.
Top ten Greater Manchester hot spots for Japanese Knotweed. (Image: Environet UK) With 3,558 total sightings across Greater Manchester, Japanese knotweed is becoming an increasing concern for homeowners, developers and local authorities alike.
In some cases, allowing these invasive weeds to grow on a property could put homeowners at risk of an anti-social behaviour order (ASBO).
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Japanese Knotweed spotted in Bolton according to Environet
The invasive plant, known for its ability to grow through concrete, tarmac and drains, can seriously impact house sales and property values, even when it causes no direct structural damage.
Originally introduced to the UK in the 19th century as an ornamental plant, knotweed has spread aggressively.
The map is updated with new verified sightings throughout the year, providing the most comprehensive online record of Japanese knotweed in the country. (Image: Environet UK) Its underground rhizomes can extend up to seven metres horizontally and three metres deep, making it notoriously difficult to remove without specialist treatment.
Emily Grant, director at Environet UK, said the findings should serve as a wake-up call for residents in Bolton.
She said: “Bolton is by far the most affected location in Greater Manchester this year, and this level of infestation should be taken seriously by homeowners.
“We’re now at the height of knotweed’s growing season, making it much easier to spot.
“Look for lush green leaves shaped like hearts, bamboo-like stems, and a distinctive zigzag growth pattern.
“The plant flowers in late summer, producing clusters of small white blooms.”
Ms Grant warned that untreated infestations could lead to disputes between neighbours, delays in property sales, and in some cases, a five per cent drop in property value. Nationwide, the annual cost of managing knotweed and related issues is estimated at £250 million, according to the Department for Environment Food and Rural Affairs.