Chris, I've seen Agapanthus growing in the ground in the Austin, San Antonio, and Houston areas where it seems to do well. I'm growing it. Mine is in a large clay pot. I've left it out on multiple occasions in below 32F temperatures. I have brought it inside in the garage for cold spells that get into the teens or when the cold spell is predicted to be one of long duration. I think in your area it would normally do okay in normal weather, but might need a little extra protection on the rare cold spells that drop too low or last too long. I think it might benefit, much like Amaryllis, if it could be located in a south or southwest facing location which would naturally give it a break from the coldest temps. That's just my opinion based on how mine is performing and on how I've seen it growing otherwise. Mine was hit by the low 20sF this year, but that was not enough to kill all the foliage nor send it completely into dormancy. I did have it inside for the night where the temps were between 10-11F. A container gets colder than an in ground situation and I don't trust it. Also, I think freezing temps delay how soon you will see bloom.
