I would like to know which, if any, of the tree ferns can withstand our zone 8a mississippi heat and humidity summer outside.I know how to protect it from the cold but the heat is my question.also.does anyone know of a good source where to buy a tree fern.Online sources are too small and expensive,I live near the gulf coast and mobile.Anyone had any experience growing these outside in the deep south?any advice appreciated.Thanks!