"Andy Dingley" wrote in message
...
AIUI, our stuff is J. regia and the US stuff in J. nigra. They don't
look the same, and no-one else claims they're the same species. Even the
guy in Oxford with the huge experimental plots of collected worldwide
walnuts is pushing J. regia as the fine cabinetry wood, rather than J.
nigra.


The regia is grafted onto the more hardy nigra roots for nut production.
Turkish and English should be the same species, with the original from the
Caucasus.