Knotweed Ireland

Problems With Knotweed

Japanese knotweeds are a non-native invasive species of perennial plant. The vigorous growth can damage buildings and infrastructure. Once established underneath or around the built environment, it can be particularly hard to control. Riverside Japanese knotweed stands damage flood defence structures and reduces the capacity of channels to carry floodwater. The aggressive growth pattern is capable of exposing weaknesses in hard engineered structures such as concrete, tarmac, brick walls and foundations Current trials have shown that as little as 0.7 gram of rhizome material (10 mm in length) can produce a new plant within 10 days