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3w ago

Heatmap Tracks 100,000 Japanese Knotweed Cases With Bristol as Top Hotspot

Environet’s Exposed map highlights Bristol, Bolton, Stoke-on-Trent and Worcester as major knotweed hotspots with homeowners urged to verify sightings before peak growth season

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Overview

  • Environet’s Exposed heatmap has logged more than 100,000 verified Japanese knotweed sightings across the UK, averaging 1.1 incidences per square mile.
  • Bristol led national rankings with 1,440 sightings or 33.91 incidences per square mile, making it England’s knotweed capital.
  • Bolton emerged as Greater Manchester’s worst-affected borough with 1,494 recorded infestations accounting for over 40% of regional cases.
  • Stoke-on-Trent recorded 112 verified sightings as Staffordshire’s hotspot; Worcestershire tallied 723 cases with Worcester leading the county.
  • Homeowners must disclose knotweed infestations when selling and secure professional treatment before mortgage approval as rhizomes can undermine structures and management costs reach nearly £250 million annually.