If you' re soil has a good PH level around 7.0, Ladino White Clover, Kenland Red Clover, or Alfalfa would be a good plot. The white seems lower growing than the red. But the deer here destroyed the Red Clover plot. It didn' t seem to have the rebounding abilities of the White. I have not tried Alfalfa here as my soil doesn' t have the trace minerals needed for it' s growth. My soil is mostly clay. You could try the advertised brands like Biologic, etc. but you will pay dearly for the seed against buying it locally at a farm supply or Coop. These three will last 3-4 years, depending how weed free they stay. For annual crops, I would suggest Iron Clay Peas or even Soy Beans. I have put in a half-acre of Austrial winter peas this fall and they are doing quite well. You do need to protect them from the deer for about 2-3 weeks or they will pull them out by the roots while small. I put a string fence about 2-3 ft. high around the plot and hung white plastic shopping bags on it at 6 ft. intevals. Colored bags don' t work. The deer have hardly touched it.
I am in North Miss. about 60 miles due East of Memphis. So I fugure I am in the same temp zone as you. Maybe some others can give you some additional suggestions.

Russ