Boston ferns need a cool place with high humidity and indirect light. When you care for Boston fern plants indoors, it's a good idea to provide additional humidity for them, especially in the winter. Most homes are rather dry, even more when heaters are running.
Water the fern when the soil becomes damp. Do not allow the soil to dry out. This may mean watering twice a week or daily in hot weather. The frequency will change depending on the temperature and moisture in your home.