About Bird's Nest Ferns
Asplenium nidus, the bird's nest fern, is the most commonly cultivated asplenium as a houseplant. Its common name comes from the dark, fibrous centre of the rosette, which resembles a bird's nest. In the wild, aspleniums grow as epiphytes on trees in tropical rainforests, catching falling leaf litter and moisture in their central cup. Cultivated specimens develop fronds 30-90 cm long under good conditions.
Light Requirements
Bird's nest ferns are well suited to low and indirect light, making them excellent for north-facing rooms and positions away from windows. Bright, indirect light promotes faster growth and wider fronds, but direct sun will scorch and bleach the leaves. A shaded east or north windowsill is ideal.
Watering
Keep the compost consistently moist but never waterlogged. Water around the edges of the pot, avoiding pouring water directly into the central rosette where new fronds emerge as this can cause rotting. Use room-temperature water. In winter, reduce watering slightly but never allow the compost to dry out completely.
Humidity
As a tropical rainforest native, asplenium appreciates high humidity. Mist daily, place on a pebble tray with water, or keep in a naturally humid room such as a bathroom or kitchen. Low humidity causes frond edges to brown and crisp.
Temperature
Aspleniums prefer temperatures of 15-27 degrees C. They will tolerate brief dips towards 10 degrees C but dislike cold draughts and temperatures below this. Avoid placing near exterior doors or on cold windowsills in winter.
Feeding and Repotting
Feed monthly during spring and summer with a balanced liquid fertiliser at half strength. Aspleniums are slow-growing and rarely need repotting more than every 2-3 years. Move up one pot size only when roots are visibly escaping the drainage holes. Use a peat-free, moisture-retentive compost with added perlite.
Common Problems
Brown frond edges are usually caused by low humidity or irregular watering. Yellowing fronds indicate overwatering or root rot. Scale insects and mealybugs occasionally appear on the undersides of fronds and can be treated with neem oil or a systemic insecticide.
