Some ferns like to be kept almost wet while others should dry slightly between waterings . Be sure not to allow any of them to dry out completely. Do not allow water to stand in pots since this can lead to root damage. Potting soil for ferns should be porous and allow excess water to drain quickly. Ferns grow best in an organic potting medium similar to soils in their natural habitats.
Humidity is usually too low in the home for fine, thin-leafed ferns.
Double pot your plants to help provide extra moisture. Double pot by placing the main growing container inside a second container lined with moist sphagnum moss. You can also lightly mist ferns occasionally. The humidity level in houses is very low during winter and ferns will need extra attention. Most ferns should be fertilized lightly once a month from April through September.