Growing Maidenhair Ferns

Maidenhair Ferns are among the most beautiful plants to grow indoors.  However, few stores sell them because most people struggle to keep them alive. Here is some advice from a biologist.

The basic idea is to give the plants enough water, fertilizer and light to thrive.  But everyone knows that; the difficulty is in the details of the implementation. 


Put the fern in a pot that makes it easy to keep the soil wet.  I usually use 2 gallon pots that have small projections of the pot into a water tray at the bottom.  To water the plant, you shine a flashlight into the tray, and if the tray is dry, you can add 2 cups of water (500 ml) from the top of the plant and it will not overflow.  Under normal conditions, the plants will only need to be watered once a week, but water needs are greater if the plant gets a lot of sun or very hot weather.  With the 3.6 gallon size, one can add even more water at a time and the plant is even less likely to dry out.  But if it were that simple maidenhair ferns would be sold more widely. Here are the things that can go wrong and how you can prevent them:


Maidenhair ferns do best with only a few hours of sunlight a day. If they are very close to a south-facing window they will get too much sunlight and need very frequent watering.  Furthermore, a fern shows its best appearance to the direction from which the sunlight comes.  Accordingly, the best location is in the interior of a room, leaving the plant in the shade for most of the day.  Such positioning also makes it possible for the fern to be viewed from the same direction as it gets sunshine, showing its most pleasing appearance.


Plants need fertilizer to get chemicals such as phosphates and nitrogen-containing compounds needed for the plant to grow.  But as discussed above, too much fertilizer can kill a plant by raising the osmolarity.  The best approach is to add a few drops of fertilizer to each gallon when watering. Many diifferent brands of fertilizer should be fine, but I use Miracle-Gro All Purpose Plant Food, which comes as a powder.  I add enough powder to create a saturated solution and then dispense the fertilizer using a medicine dropper.  Adding a bit of food coloring makes the solution more visible.