Researchers have found little evidence Japanese knotweed causes significant structural damage to properties. Ecologists from global infrastructure services firm AECOM and the University of Leeds have carried out the most extensive research to date on Japanese knotweed (Fallopia japonica), which is a notorious non-native species in the UK, and elsewhere in Europe and North America. Their survey reported on 122 properties where Japanese knotweed was present and showed that reports of defects or structural damage to residential properties were rare. Researchers also visited 68 pre-1900 residential properties located on three streets in northern England, chosen because they had been abandoned for at least ten years and were already in a state of disrepair, and so represented a ‘worst case’ scenario in terms of susceptibility to damage from unchecked plant growth. While knotweed was identified within seven metres of 18 of the properties, it was linked to less damage than the trees, … (To read the full article, subscribe below)

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