Thanks Latt. I've enjoyed reading everyone's posts, and have certainly learned tons in a short time because of them.
I, too, have found areas that were absolutely lush with every kind of companion plant, but were void of ginseng. Like you, I can only assume that good stewardship has not been exercised over the years, and the end result is that there is nothing left in that location for future generations.
Last fall, I was the beneficiary multiple times of someone planting seeds 10+ years prior. I remember one case where my son-in-law and I had been finding a plant here, a plant there, but all of a sudden stumbled on a dozen large 3 and 4 prongers, all the same age, all within a 5 foot radius. To us, it was the mother lode!
As I was a rookie, it took me a couple days to figure out what I had seen, but it finally occurred to me that someone years before had planted the seeds off of the mother plant, and that a large number of them had made it. We planted a lot of seeds that afternoon, so I can only imagine that whoever comes through years from now will find quite the treasure.