EU (Birds and Natural Habitats) Regulations 2011 make it an offence to plant, disperse, allow dispersal or cause the spread of listed species such as Japanese Knotweed (Fallopia japonica).
A list of Invasive Species in Ireland can be found on invasives.ie. Sightings of invasive species can also be reported on this website or on the website http://records.biodiversityireland.ie/record/invasives.
Japanese Knotweed (F. japonica) is native to Japan, Korea, Taiwan and China, is now widespread in continental Europe and Britain. Knotweed is suited to a wide range of conditions, including full shade, high temperatures, high salinity and drought. It is found near water sources, such as along river banks, low-lying and disturbed areas. It can colonise coastal shores and islands.
Japanese Knotweed is a threat in open and riparian areas where it speads rapidly to form dense stands, excluding native vegetation and prohibiting regeneration. This reduces species diversity and alters habitat for wildlife. Once stands become established, they are extremely persistent and difficult to remove.