Cattleya walkeriana

My C. walkeriana started a new growth about a month ago.  The (very thick) roots started growing about a week ago, at which time I mounted it.  I was going to mount it on cork, but I decided to mount it on a piece of crepe myrtle instead.  It is tied to the mount with cotton twine and is sitting in an empty clay pot.  Once it attaches I will remove the twine.