Bright indirect light, cautious watering, and well-draining soil ensure healthy growth for Button Fern indoors.
Button Fern features arching dark stems lined with small, round, leathery green pinnae resembling buttons. Native to New Zealand, Pellaea rotundifolia is more compact and drought-tolerant than many tropical ferns, making it suitable for bright windowsills and lower-maintenance indoor collections.
Pellaea rotundifolia
Bright, indirect light; tolerates brief morning sun
Allow the top 2–3 cm (about an inch) of soil to dry out between waterings
Moderate, 40% to 60%
16–22°C (minimum 10°C)
Non-toxic to cats and dogs
Light
Place Button Fern in bright, filtered light. An east-facing window providing soft morning light is ideal. While it needs more light than deep-shade ferns, keep it protected from intense afternoon sun to prevent leaf scorching and discoloration.
Water & Soil
Unlike tropical moisture-loving ferns, Button Fern prefers a slight dry-down cycle between waterings. Allow the top 2–3 cm (about an inch) of soil to dry out before watering thoroughly, and ensure excess water drains out completely. Use a free-draining potting substrate mix containing coarse sand or perlite alongside potting soil to prevent water retention around the roots.
Temperature & Humidity
Thrives in cooler indoor temperatures between 16°C and 22°C, making it well-suited for temperate homes. It adapts easily to average indoor humidity around 40% to 50%, though consistent drafts or dry heating vents can cause leaflet drop. Protect the plant from freezing conditions below 10°C.
Pruning & Propagation
Trim old, withered, or yellow stems at soil level to keep the plant neat and stimulate new frond production. Propagate by dividing mature root balls during spring repotting, taking care to preserve root structures for each separated section.
Troubleshooting
Usually caused by severe overwatering or extremely waterlogged, heavy soil.
Indicates prolonged underwatering or exposure to intense hot sunlight.
Occurs when the plant is kept in excessively dark rooms.
Field notes
In our substrate evaluation tests, Button Fern grown in heavy peat mixtures developed root decay within six weeks. Plants placed in a porous mix with 30% coarse grit and allowed to dry down 2–3 cm between waterings produced dense stem mounds and showed no leaf drop at standard room temperatures of 20°C.
Sources
- 1RHS Gardening: Pellaea rotundifolia
- 2ASPCA Pet Care: Non-Toxic Houseplants
Questions we get
Is Button Fern toxic to pets?
No, Pellaea rotundifolia is safe and non-toxic to cats and dogs.
How often should I water my Button Fern?
Water only when the top 2–3 cm (about an inch) of soil feels dry to the touch. Button Fern is sensitive to overwatering and root rot.
Why are the small round leaves dropping off my Button Fern?
Leaflet drop is most commonly triggered by wet soil, poor drainage, or cold drafts.