I am still a newcomer to Georgia and haven't discovered much of the nature art produced here.  
If you have any suggestions of upcoming exhibits relating to art in nature please contact me.   
Below are some of the exciting nature art places that I have visited so far in Georgia:

Atlanta Botanical Gardens, Georgia
A fantastic place to see orchids and carnivorous plants and wonderful nature art work.

The Morris Art Museum, Augusta, GA
A wonderful collection of nature landscapes and impressionistic paintings to look at for the nature
artist.

Georgia State Botanical Garden, Athens, Georgia
A dynamic art exhibit that includes a wonderful exhibit of art made from things found in nature.
There are also ongoing exhibits of 2 dimensional art in the visitor building lobby. .
NATURE ART EXHIBITS TO VISIT NEARBY:
A Few Choice Nature Art Exhibits in the San
Francisco Bay Area
:
(Click on the undrlined words)
William Lester Gallery: www.williamlestergallery.com
11101 Shoreline Highway, Pt. Reyes Station, CA  94956
Ongoing Nature Landscape painting in different media.
Be sure to check out their website - it has wonderful displays
of the artists' art work.

Oakland Museum: www.museumca.org
1000 Oak Street, Oakland, CA 94607  510 238-2200

Mount Diablo Summit Museum: www.mdia.org
RECENLTY RECOMMENDED NATURE
PAINTING WEBSITES:
  
Water Color Galleries and Classes:
http://www.youcreate.com/Default.htm

Painting with Light:
http://www.lightandcolor.com
Sketch Nature
Classes and Exhibits in Georgia.... sketchnature.com
BIRD SKETCHING BOOKS & WEBSITES:
Mike Patterson's Bird Sketching Website
A website with a series of lessons and demos
describing how to draw birds.
Trevor Smith's Sketching Wild Birds
A great website and book offer about sketching birds