Staghorn ferns (Platycerium spp.) have an out-of-this-world appearance. The plants have two types of leaves, one of which resembles the horns of a large herbivore. The plants grow outdoors in warm-season locations and indoors elsewhere. Mounted or in a basket is how to grow a staghorn fern, because they are epiphytic, growing in trees generally. Staghorn fern care relies on careful light, temperature, and moisture monitoring.