Staghorn FernGrowth Habit: Upright, this variety reaches about 2 4' tall and wide. Light Requirements: Does not prefer direct sunlight. In outdoor garden spaces, ferns do well in shade, but inside they do prefer bright to moderate indirect light! Tolerant of low light conditions as well. Toxicity: Non toxic to both cats and dogs according to ASPCA. General Care: Prefer constant moisture in the soil without it being soggy.