Japanese knotweed growth across a lawn

Japanese knotweed on a development site

Japanese knotweed can make a site economically unviable to develop. 

Recently we were commissioned to assess a residential development site that had been undergoing a knotweed herbicide treatment programme by another Japanese knotweed specialist for 7 years, to check whether the knotweed was eradicated prior to site purchase. Our client was looking to build fourteen houses on the site.