Greetings all: Not to be pedantic, but there is a caveat about tree fern. As I understand it, while it is fine for most orchids, it is unsuitable for angraecoids (Angreaecum, Aerangis
. They will die (I'm not sure that we know the specific reason). If you plan to grow angraecoids, use cork bark or a coir fibre mat. If not, tree fern is fine.