On best companion plants...
Maidenhair Fern, Cohosh, Hog Peanut, Bainberry
And preferably a combination of 2-3 of those on the hillside.
Like others I have seen hollows just full of MHF, and the others by themselves.. but no seng.
But when you have a combination of those showing up, like MHF and Bainberry, it seems that Ginseng is more frequently found. Hog Peanut will grow in a much wider range than seng, but when it starts showing up thick and healthy looking, that is when seng is likely to be nearby.
Down here in the south, (southern middle TN), it has to be a north to north east facing hillside too... it is just to hot down here for it to grow on other slopes.
When it comes to trees... Maple, Poplar, Black Walnut, Ash.
Wildgrown will sell you some good seed.
I would highly recommend that you plant it scattered here and there instead in large beds. I have done both, and where I have large beds the deer browse it really bad, and it also suffered something awful in the early years from disease until it thinned out some.
The areas where I planted a couple seeds here, and a couple of seeds there, spacing them out generously, it is doing really good, no disease, and the deer don't seem to be able to just find it and mow it down like they do in the large beds.
Good Luck to you !
TNHunter