Japanese knotweed - Fallopia Japonica- progress and inprogress

Organza pages of distribution of Japanese knotweed based on data http://www.bsbi.org.uk/maps_scheme.html

The data shows the progress of the plant from 1929 to the present day in 6 map distribution charts. 

Below 5 organza layers charting this progress of distribution and a silk base map.