Choose the right soil for your fern. If you have an epiphytic fern (a fern that grows in a tree), you should plant it in a coarse soil that allows water to drain more easily. If you have a terrestrial fern (a fern that grows in the soil), you can plant it in ordinary potting soil found at your local retailer.
Put your fern in a plastic container or other container with a sufficient drainage system. It's important to allow for drainage, so avoid solid containers like clay pots without holes in the bottom. This will allow for better moisture levels, mimicking the humidity that ferns are used to.
Set your fern in an area of the house that will allow it to get indirect sunlight for about four hours daily. Too much direct sunlight will dry it out or even burn the leaves, so it's better to place it in a partially shaded area. Room temperature should be between 65 and 75 degrees Fahrenheit.
Water your fern fairly regularly, but be aware that these plants can be overwatered. Stick your finger in the soil to test whether your fern needs to be watered. If it's fairly moist, then you may skip watering for the day. If, however, it feels slightly dry, then add water directly to the soil (making sure not to pour over the leaves) until it becomes evenly moist. If you notice black roots, reduce the amount of water you pour, as this is an indication of overwatering.
Add plant fertilizer with equal parts nitrogen, phosphorous and potassium (for instance, a 20-20-20 mix) once monthly between March and October. If you notice the foliage colors turning lighter green, then you may want to get a mixture with more nitrogen. Avoid feeding your fern during the winter months. However, it is a good idea to mist it during the winter.
Inspect your fern periodically for diseases. Typical signs of disease include yellowing and withering of leaves, as well as drooping of foliage or brown spots on the leaves. If it seems that your fern has a disease, spray it with an insecticidal soap.