How much sun does it need? Will it grow in south Florida?

The purple diamond loropetalum likes full sun. It thrives in the southern U.S. inlclduing south florida.

What growth zones are recommended

The purple diamond loropetalum thrives in USDA zones 7-10

Would this be a hardy choice for a Southern Georgia USA climate...?

Yes, the purple diamond loropetalum thrives in zones 7-10 which inlcudes Georgia

Is it deer proof?

Yes, the purple diamond loropetalum is deer resistant.