Japanese knotweed sighting map released for Gloucestershire

The latest data shows 628 confirmed sightings of Japanese knotweed, highlighting areas of concern.

Map reveals Japanese knotweed hotspots in Gloucestershire for 2025

As the growing season for Japanese knotweed reaches its peak, Environet has released a map identifying 628 locations of this invasive plant in Gloucestershire for 2025. The Japanese Knotweed Heatmap, which documents over 100,000 sightings across the UK, allows the public to search their postcode to see nearby infestations. The heatmap color-codes hotspots to indicate the risk levels to homes and properties. The top area, Mangotsfield, has reported 39 instances, with other notable locations including Kingswood and Lydney. Japanese knotweed, introduced in the 1800s, is known for its destructive root systems that can damage structures and significantly reduce property values.

The emergence of Japanese knotweed as a significant threat to property in the UK raises critical concerns for homeowners and potential buyers. With mortgage lenders tightening their requirements around infestations, the financial impact could extend far beyond individual homeowners. The considerable cost to the economy, estimated at £250 million annually, highlights the urgent need for effective public awareness and early detection strategies. Environet’s map serves not only as a cautionary tool but also empowers communities to actively participate in controlling this invasive species, emphasizing the importance of vigilance and prompt action.

Highlights

The fight against Japanese knotweed illustrates the need for community awareness and proactive management.