Buy a staghorn fern at a nursery, knock it out of its container and hold it, shield facing up, against a piece of wood. Pack a tight pocket of sphagnum moss (soaked and wrung out) around the shield, and secure the pocket to the wood with fishing line. (As new shields unfurl, they'll hide the line.) Display on an indoor wall that gets indirect light. Remove it once a week to water gently at the sink; use fish emulsion as a fertilizer once a month.