Cork is okay but mount it on the smooth inner side if it has one. Phal. don't like very rough surfaces. Unless your humidity is very high (Right, you live in Loisiana ) you will have to water 2-3 times a day. Personally, I don't use sphagnum. Be sure you lead end is pointed down or water will sit in the crown. Mist the roots a few times a day until new ones grow and adhere to the mount.