Believe it or not, American Ginsing seems to highly prized...at least according to my Chinese wife. It is a different variety than what they get in China, and is apparently considered to be premium grade stuff.
When we went to China last year to do some genealogy research, we met with several people that had been helping my wife. We gave them all gift boxes of American ginsing, and they all seemed quite pleased.
A quick google search found it
here.