From: "Boyce Tankersley" <btankers@chicagobotanic.org>
> Hi Kathleen:
>
> Our experience at CBG strongly suggests that invasiveness is very much a
> regional characteristic. For instance in the Chicago area Buckthorn is
> invasive but in other regions experiencing a zone 5 climate it is not
>
Invasiveness is so strange. I had to look up European Buckthorn it's Rhamnus cathartica,
and a plant that we are always pleased to see here in Sweden, it's not rare but the
sort of plant thats worth a special mention. It was first reported during the 1600's,
which means it counts as native. Well well!
/Neil
PS. Still no chance of any plants in our garden, as it's still covered in a decimeter
of snow.