What ground cover should I plant

I am starting to think about what groundcovers I should plant. Florida Native Nurseries has a cool site. I am pretty sure my land is Sandhills in zone 8b according to their map.

This site has a good graphic of the layers of a food forest Temperate Climate Permaculture (scroll down to see it)

Here is a Mother Earth News Forest Gardening: Establishing the Ground Layer article

Here is a good post on the PermacultureJAX meetup group forum

cover crops