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Japanese knotweed: The nightmare neighbour

The damage that Japanese knotweed can cause has been highly publicised over recent years. Growing by up to 10cm a day, it quickly covers land above ground, and has the potential to spread widely underground. It is said to spread beneath the foundations of properties and compromise their structure; it can cause cracks, undermine garden walls with shallow foundations, and even push over insubstantial outbuildings.  While some may argue that the damage it is alleged to cause is something of an urban myth, professional guidance nonetheless does suggest that all ground within 7m of Japanese knotweed should be considered blighted. For that reason, lenders will often refuse to lend against a property where Japanese knotweed is found within such close proximity. Proper remediation to eradicate the knotweed can take years, and is extremely costly.

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