Russ, I grow hundreds of S. African species very successfully here in Austin, Texas (USDA cold zone 8b, heat zone 9). Most are in pots, but I am trying more in the ground each year, generally with surprising success if they are planted in good drainage. In many ways, most of Louisiana would be easier than here. Your weather is less extreme/changeable, and your water/soil is more acidic. Half of Austin sits on a limestone escarpment (Edward's Plateau) and all our water filters through it. Would be glad to chat with you and share tips on growing in the South-East US. m