Spanish Moss (Tillandsia usneoides), is this absolutely beautiful and peculiar type of airplant. Common enough to say everyone has seen it, but not everyone understands it.
It is a Tillandsia like the others, means it is epiphytic. Treat them as you would the other and it shall do great!
A great article by James Missier on Garden Chronicles to read about this amazing plants.
Amazing Spanish moss decoration by PlantWerkz