Bird's Nest Ferns (Asplenium nidus) are naturally epiphytic, meaning they grow on the surface of other plants. In their rainforest homes, they can be found growing high in the crooks of trees. They form a series of erect, spoon-shaped, bright green fronds that rise from a central rosette. Healthy plants can have fronds up to 5 feet long, but bird's nest ferns kept as houseplants typically have fronds that grow only about 2 feet long. These ferns have a slow growth rate. They're best planted in the spring, though houseplants generally can be started year-round.
The key to a healthy bird's nest fern is providing it with ample warmth, humidity, and moisture. When growing it as a houseplant, one of the best places to situate a bird's nest fern is near a shower or tub in a bathroom where it will receive optimal humidity and warmth, though it must have a light source as well.