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.