The ‘Cute as a Button Fern’ (Pellaea rotundifolia) is a popular houseplant known for its distinctive appearance. This charming fern features small, round, button-like leaves along graceful, arching fronds. Native to New Zealand and Australia, its compact growth and lush, deep green foliage make it a delightful addition to indoor settings.
Button Fern Care Essentials
Button ferns thrive in bright, indirect light, mimicking their native woodland environments where they receive filtered sun. Direct sunlight can scorch their delicate fronds, while insufficient light may result in leggy growth and less vibrant foliage. An ideal indoor placement is near a north-facing window or where light is diffused by sheer curtains.
Consistent moisture is important for button ferns, though they tolerate drier soil than many other fern varieties. The soil should remain consistently moist but never waterlogged, as this can quickly lead to root rot. Water thoroughly when the top inch of soil feels dry, ensuring excess water drains completely.
A well-draining, airy potting mix is suitable for Pellaea rotundifolia. A standard houseplant potting mix works well, and you can enhance drainage by adding perlite or vermiculite. Some growers use a mix of peat moss or coconut coir, perlite, and vermiculite for an optimal environment.
Button ferns prefer warm conditions with moderate to high humidity, ideally 65-80°F (18-27°C) and 40-50% humidity. While they tolerate slightly lower humidity than some ferns, very dry air can cause leaf tips to brown. Increase humidity by placing the pot on a pebble tray, grouping plants, or using a room humidifier.
Fertilize button ferns sparingly, as they are not heavy feeders. During the growing season (spring and summer), apply a balanced liquid houseplant fertilizer diluted to half or quarter strength every one to two months. Stop fertilizing when days shorten in the fall, allowing the plant to rest.
Maintaining Your Button Fern
Repot button ferns every two to three years, or when they become root-bound, indicated by roots growing out of drainage holes or filling the container. Spring is the best time to repot. Move the fern to a pot only one size larger, use fresh potting mix, ensure the plant is placed at the same depth, and water thoroughly.
Propagate button ferns through division, a straightforward method suitable for mature plants. During repotting, gently remove the plant and carefully separate the root ball into smaller sections, ensuring each division has foliage and rhizomes. Plant each new section into its own pot with fresh potting mix, water well, and keep in a warm spot with indirect light.
Troubleshooting Button Fern Issues
Browning or yellowing leaves on a button fern can signal several issues. Browning, crispy fronds often indicate underwatering or insufficient humidity. Yellow leaves, especially with mushiness, typically point to overwatering and potential root rot. Address these problems by adjusting watering frequency and ensuring adequate drainage and humidity.
Button ferns are generally robust but can encounter common houseplant pests like spider mites, mealybugs, or aphids, especially if the air is too dry. Regular inspection helps early detection; pests can be managed with organic or chemical treatments. Fungal diseases, such as root rot, are primarily a concern with overwatering, emphasizing proper drainage and allowing the soil to dry slightly between waterings.