The fence was planted in Germany around 1940.
Konstantin Kirsch writes:Hi Richard, There are new pictures from the living fence. A reader of my blog was visiting this great arborsclupture. He also made some pictures of the leaves. So I can tell you that the species is Sorbus intermedia. But the half of the fence is made out of forsythia!
Find the pictures here:
http://www.d-marc.de/natur/ohrdruf/index.htm You may click on the pictures to enlarge them