I did a web search and found a very detailed study that was done on the subject (url below to the full article).
http://www.as.wvu.edu/biology/faculty/JBMPersonalSite/2005BerryRipening.pdfBelow is a few cuts from it:
"Overall, 31% of the ginseng seeds planted in 1998 germinated 18 months after planting"
"we observed that seeds from red berries germinated at nearly 3 times the rate of seeds from green berries"
"50% of the seeds from green berries planted near that stage of development (August 26) germinated, while only 4% of seeds from green berries planted in early August germinated.
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So - I would say "DO" plant those green berries if you find em. Even a slim chance (in favor of ginsng) is one worth taking the time for.
I have not finished reading all of the article yet but will.
TNhunter