sengfever,
As Latt mentioned above and what Scott Persons recommends in his book 4-5 seeds per sq ft should work.
He says that if you have a good location and plant at 4-5 per sq ft you should end up with about 1-2 per sq ft at harvest time.
The thicker you plant them the more likely you are to have disease problems so I would not plant them too thick.
I am sure no expert - just started planting wild-simulated myself last fall/winter so I am just trying to go by what is recommended in Scotts book.
Below is a link to his book on barnesandnoble.
search.barnesandnoble.com/Growing-and-Ma.../9780914875420/#TABS
Below is a link to my youtube channel.
I do have a 2 part video showing how I planted my wild-simulated this past fall/winter and a couple more showing the results this spring. Also several more vids on ginseng hunting.
Good Luck !
TNhunter
www.youtube.com/yttnhunter