Ferns vary in their growing condition needs. Several commonly grown indoor ferns have a well-earned reputation for being finicky growers, but others are surprisingly easy. Ferns with tough, leathery foliage usually adapt better to typical household conditions than feathery, delicate types. The more delicate types of ferns will grow best where they can be given special care. A terrarium or a very humid area such as a bathroom will suit them well.

Most ferns prefer moderate, indirect light inside. Close to a north-facing window is ideal. Never put ferns directly in a south or west-facing window. Direct sunlight will damage the foliage.

The ideal temperature range for most ferns is between 60 and 70 °F during the day. They like to be kept about 10 °F cooler at night.

All ferns are moisture lovers, but the amount that they need varies among the many different types of ferns. 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. Liquid houseplant fertilizers should be applied at about one-half the recommended rate. Ferns will leaf scorch when fertilized too heavily. Do not fertilize ferns during the winter. Do not feed new or repotted plants for six months.

The best method of propagating most ferns is by division. Repot overcrowded plants in early spring, using a mixture of equal parts of a packaged houseplant potting mix and peat moss or leaf mold.

Fern fronds are sensitive to rough handling. Place ferns out of high-traffic areas to avoid damage.