Water the staghorn fern well.

Remove the plant from the pot.

Pull away excess soil and some of the roots.

Place a handful of damp sphagnum moss on the front side of the mounting plaque. 

Place the fern on the sphagnum moss.

Staple one end of fishing line to the side of the plaque.

Wrap the fishing line around and between the fern leaves from top to bottom and side to side. 

Finish by stapling the end to the plaque.

Twist picture wire onto the loops on the back of the mounting plaque and hang.