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Japanese knotweed is one of the most invasive and destructive plants in the UK.
The extremely aggressive plant can grow up to four inches a day in the summer and the plant’s roots can spread so far underground finding its way into existing cracks in concrete, pathways and walls or it finds its way into basements, causing structural damage to buildings.
The map provided by Environet pinpoints thousands of infestations across the country. The worst areas have been located in outer London, Merseyside, Lancashire, Bristol, Newport, Swansea, Nottingham and Sheffield, as they are home to high volumes of the weed.
As experts in treating Japanese knotweed we recommend it being treated during early and late Summer with the dead stems (above ground growth) removed in the Winter. However, standard advice is to treat Japanese knotweed as soon as it is identified.
Clearway’s teams are qualified and accredited to use undiluted industrial strength Glyphosate. This is injected directly into each stem (stem injection) for larger plants and sprayed onto smaller plants (foliage spray). If spraying is not suitable for a given area we are also able to provide removal by excavation.