Although rather attractive, Japanese knotweed (Fallopia Japonica) is a real thug as it spreads so rapidly and is taking over our native plant species.
Japanese Knotweed has no natural enemies. Being a non-native species no insects or animals have evolved to use the plant to graze. When left unchecked it will spread at an enormous rate rendering lands not fit for purpose or posing structural threat.
New legislation now covers its control if you have got Japanese Knotweed on your property and it is causing a detrimental effect of a persistent or continuing nature on the quality of life of those in the locality and that the conduct is unreasonable,this includes failure to act- a community protection notice can be used against us. Basically an ASBO but it is easy to avoid such legislation once acted upon.