Maidenhair ferns are delicate plants with very small fronds and a lace-like appearance. They’re considered hardy ferns, rather than ferns preferring steamier conditions, but don’t let the description fool you. Maidenhair ferns can be difficult to keep healthy indoors, as they’re quite particular about their growing conditions. The most important environmental factor when it comes to caring for this fern with success is humidity—it thrives on moisture and needs a lot to survive, which can often be difficult to achieve in indoor environments.
Light
In their natural forest environment, maidenhair ferns are primarily covered by a canopy of trees, receiving a bit of shade and partial sunlight. To successfully grow the fern indoors, try and mimic these conditions by finding a spot in your home that receives indirect sunlight only. Avoid harsh light or direct rays, as the delicate leaves of the maidenhair fern can burn very easily. However, too little light leads to poor growth and yellowing fronds. Try to find a spot that receives indirect morning or afternoon sun, like a northern window. But be careful: this prima donna dislikes cold drafts!
Soil
Maidenhair ferns prefer moist but well-draining potting soil. As mentioned, water is very important to this fern, so up your chances of creating the proper environment for it by incorporating moss or an organic matter like compost into the soil to help it to retain water.
Water
Your best bet to ensure that your thirsty maidenhair fern thrives is to focus on giving it multiple water sources. Consistently moist soil is a great place to start—from there, be sure to water your fern regularly, either daily or every other day, never allowing the soil to dry out. Watch for yellow leaves that may occur from overwatering. Do not let the plant’s roots stand in water. Moisture is vital–but drainage is important to avoid root rot. Keep the fern in a plastic pot with holes, then place that plastic pot in a more attractive outer pot if you wish. This way, you can easily check on the moisture levels in the plastic pot, and the drainage holes will prevent the soil from becoming too soggy. To water, simply remove the plastic pot from the cache pot, water the plant over a sink until the water stops draining from the plastic pot, then replace in the cache pot.
Temperature and Humidity
This fern requires very warm, humid air. To mimic its ideal conditions, mist the plant with warm water a couple of times a day to maintain the proper moisture levels on its delicate leaves. Alternatively, you can place the potted plant near a humidifier or atop a tray of wet pebbles to increase humidity levels. Also consider housing the plant in a moisture-rich environment at home, such as a bathroom or garden greenhouse. Temperature-wise, the fern is best kept above 70 degrees Fahrenheit and should not be placed anywhere in your home where the temperature or cold drafts dip below 60 degrees Fahrenheit.
Fertilizer
It’s not necessary to fertilize a maidenhair fern, as the plant will do just fine without it. However, if you wish to provide it with an added dose of nutrients, feed with a balanced, diluted blend of fertilizer once a month. Avoid any fertilizer with too much nitrogen (use 200 ppm or less), which can cause the tips of the leaves to burn.
Potting and Repotting Maidenhair Ferns
These ferns can be repotted annually or biannually, depending on the pot size and the plant’s growth rate—they don’t mind being a little crowded, so don’t rush to repot them if you’re unsure. Instead, wait for signs that your fern is outgrowing its home, like the roots filling up the pot. To repot a maidenhair fern successfully:
Common Pests
Only a couple of common insects find indoor maidenhair ferns tasty. Scale and mealybugs like to attach themselves to the fronds. Check the plant regularly and treat any infestation with insecticidal soap.
Common Problems With Maidenhair Ferns
The small leaves of maidenhair ferns are very sensitive. You’ll need to find the perfect indoor spot for the plant or the leaves will let you know it’s not positioned well. If the air is too dry and the plant needs more moisture and humidity, the leaves will do the following: curl up, dry out at the tips and/or brown at the tips, and fall off. Additionally, vigilant removal of curled, dried-out, or browned leaves can also help the fern grow denser foliage.
