Do you mean Camden or Charlton County, in extreme SE GA?
The Little St. Mary's River is a tidal river from the Atlantic.
Baker County is in SW GA on the Flint River and isn't situated on the border with FL.
Large difference in growing conditions, due to the oceans's influence.
There are some growers in SE GA, that grow blueberries, a strain developed at UGA for that climate.
Also Figs and some citrus are grown there. Mostly vegetables and melons are produced by those that care to work. A lot of land has been coverted to growing Pine for pulpwood production and pine needle harvesting (baled for mulch).
I would contact the County Extension Agent to determine which fruit, nuts, berries, vegetables, etc. are recommended for the area. Some will be cultivar specific.

Oh, dear! I didn't make myself clear. I am speaking of Baker Co. FLORIDA. It's northern boundry in on the GA border where GA makes a little rectangular dip into FL.
The nearest town of any size is McClenny - where, I'm told they roll up the sidewalks at dusk. Getting in touch with the extension agent has been frustrating at best since I live at present in Jacksonville. I got the impression that I will have to physically go to the CEA's office and talk with him one on one.
So, you can see why I'd like to find a GW friend who lives in that general area. The county agent is great, but so are your neighbors! cora