‘Japanese Knotweed (Fallopia Japonica) was originally introduced to the UK in the 1850s as an ornamental plant and animal feed, but it has spread rapidly and estimates now suggest at least one infestation in every 10km2. Knotweed can grow 3 – 4m in a 10 week growing season, and as little as 0.7 grams of rhizome can produce a new plant within only 10 days. The rhizomes can spread to a depth of 3 metres, and 7 metres horizontally. This strong growth and invasive root system can damage concrete foundations, buildings, roads, paving and retaining walls. For good reason, therefore, Knotweed is described by the Environment Agency as “indisputably the UK’s most aggressive, destructive and invasive plant”.’
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Hardwicke Chambers, 10th November 2014
Source: www.hardwicke.co.uk