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The Boston fern needs bright indirect light when grown indoors (outdoors, it prefers denser shade). Some species of the Nephrolepis genus can be trained to handle almost full sun, but most species, including the N. extensis 'Bostoniensis' cultivar, prefer filtered, dappled light. It is important to keep the root ball moist at all times. If your Boston fern is sitting in a somewhat dry area (instead of humid), mist with water frequently to keep moist.