They are currently attached to (the original?) card-boardy type paper with what looks like string or perhaps tape. The paper is good enough looking that I do not feel the need to change it. However, I am concerned that the ferns have perhaps been stored lying down, and that when held vertically in a frame, they will fall down or break.

Would it be wise to glue them to the paper, and if so, how would I go about doing this? Would this be something a professional framer would know how to do?

Thanks very much for your help.