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. For extra humidity care for Boston fern, try setting your fern's pot on a tray of pebbles filled with water. You can also try lightly misting your fern once or twice a week to help it get the humidity it needs. Ensure that the fern's soil remains damp.