Lady ferns prefer evenly moist soil that is not too dry or too wet. Allow the top layer of soil to dry out slightly between waterings, but do not let the soil completely dry out. Water the fern deeply and thoroughly, ensuring that the water reaches the roots. Avoid getting water on the fronds and foliage as this can lead to fungal diseases. In addition, do not let water accumulate in the saucer or bottom of the pot, as this can cause root rot.