Repeated monitoring
To understand long-term dynamics of redistributions of native and non-native plant species, all regions should strive for regular long-term monitoring, preferably with a periodicity of five years. To facilitate monitoring, all plots should be permanently marked in the field, for instance with magnets or metal tags that can be relocated with a metal detector or coloured sticks or plastic seal security tags in remote areas where their removal is unlikely. In addition, precise sub-meter GPS coordinates should be taken at least once. Photographs should also be taken of each transect to visualize changes over time, document data collection and facilitate relocation of plots.