Hertfordshire's Japanese Knotweed hotspots revealed including St Albans, Watford, Hitchin, Hertford and Harpenden
The interactive map shows where all the 'live' cases have been recorded across the UK.
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Hertfordshire's Japanese Knotweed hotspots revealed including St Albans, Watford, Hitchin, Hertford and Harpenden
Hertfordshire Mercury
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