thanks for the link to the Experimental Farm site, hortusbrambonii! I hadn't heard of them before, and much of their Pennsylvania/New jersey stock could be well suited to my growing conditions...(and my pennsylvania dutch husband's tastes)
Growing in a coastal zone 7a in the Northern Hemisphere. Hot humid summers and cold snowy winters. Plenty of rain. Sandy loam topsoil over clay subsoil, whatever the glacier left behind when it made Long Island.