Pyrrosia lingua, commonly known as tongue fern, is a unique and low-maintenance fern that can thrive in a terrarium setting. Here is a care sheet for Pyrrosia lingua in a terrarium:
Light: Pyrrosia lingua prefers low to medium light levels. It can tolerate some bright, indirect light but should be protected from direct sunlight as it can scorch the leaves. In an indoor setting, place the terrarium near a window with filtered light or use grow lights.
Water: Pyrrosia lingua prefers consistently moist soil, but it should not be waterlogged. Water the plant when the top inch of the soil feels dry to the touch, making sure not to let the soil completely dry out. It is important to avoid overwatering, as this can cause root rot. During the winter months, reduce watering to once every 2-3 weeks.
Soil: Pyrrosia lingua prefers well-draining soil that is rich in organic matter. A mix of peat moss, perlite, and sand can be used to provide the ideal soil conditions. It is important to avoid using soil that is too dense or heavy, as this can cause root rot.
Temperature and Humidity: Pyrrosia lingua prefers temperatures between 60-80°F (15-27°C). It can tolerate slightly cooler temperatures, but it should be protected from frost and freezing temperatures. The plant also prefers high humidity levels of at least 50%. If the air in your home is dry, you can increase humidity levels by placing a tray of water near the plant or by using a humidifier.
Fertilizer: Pyrrosia lingua does not require frequent fertilization. Apply a balanced fertilizer once every 2-3 months during the growing season (spring and summer). Avoid fertilizing during the winter months.
Pruning: Pyrrosia lingua does not require frequent pruning. However, it can become quite large and may need to be pruned back to keep it from overtaking the terrarium. Remove any dead or damaged fronds to promote healthy growth.
Propagation: Pyrrosia lingua can be propagated by division. Divide the plant at the roots and plant each section in its own pot or directly in the terrarium soil. Water the new plants well and keep them in a warm and humid location until new growth appears.
Pests and Diseases: Pyrrosia lingua is relatively pest and disease-resistant. However, it can be susceptible to spider mites and other common houseplant pests. Inspect the plant regularly for signs of infestation and treat promptly with an insecticidal soap. Overwatering can also lead to root rot and other fungal diseases, so it's important to avoid this by allowing the soil to dry out partially between waterings.