Japanese knotweed (Fallopia japonica) - Non-native Species

Japanese knotweed
(Photo credit: Caroline Laburn)
Japanese knotweed is one of the most notorious invasive alien species in Britain today. Native to Japan, Taiwan and Northern China, it was introduced to Britain in the 19th century as an ornamental plant. Fallopia japonica spreads solely by vegetative means (it does not produce viable seeds) and a new plant can grow from a tiny fragment of root or stem. The plant has negative impacts on biodiversity through the smothering of native vegetation. The root rhizomes can cause serious damage to structures as they are able to penetrate concrete!

ID Sheet
Management advice