Interactive Japanese Knotweed Map Launch Interactive Japanese Knotweed Map. A new interactive map has been launched allowing users to see Japanese Knotweed cases in their local area by postcode. The map utilises records from SBIS and other NBN Atlas partners to show confirmed cases of the plant in the UK. While it is widely known for its capacity to cause structural damage to property, the invasive plant can also cause damage to watercourses and displace native vegetation. The map includes information to help identify and record new cases of Japanese Knotweed in the UK.