Crocodile Fern 4”

Crocodile Fern, Microsorum musifolium ‘Crocodyllus’, is a tropical fern grown for its long, broad green fronds covered in a raised network of veins that resembles crocodile skin. It belongs to a very different group of ferns than the finely divided, feathery types many people picture when they hear the word fern. The species is native to tropical Southeast Asia and the western Pacific region, where it grows in warm, humid forest environments. Its unusual texture becomes increasingly noticeable as the fronds mature, giving an established plant a bold, almost prehistoric appearance.

Crocodile Fern grows from a creeping rhizome, which is the thickened stem that produces both roots and new fronds. New fronds emerge tightly rolled and gradually unfurl as they develop. It does not climb and does not need a pole. Over time, the rhizome can spread across the surface of the pot and produce a wider, fuller plant. Keep the crown and rhizome near the surface of the potting mix rather than burying them deeply.

For natural light, start Crocodile Fern approximately 1–3 feet from a north-facing window or 2–4 feet from an east-facing window. Crocodile Fern prefers approximately 200–500 foot-candles at the leaves. Foot-candles simply tell you how much light is actually reaching your plant. This fern does not need the stronger light we would provide to many aroids, succulents or indoor trees, but very low light can still limit its growth. Window direction and distance are starting points because trees, overhangs, neighboring buildings, window size, season, screens and glass can all change the amount of light reaching the foliage.

If you’re using grow lights, choose a 5000–6500K fixture and aim for the same approximately 200–500 foot-candles at the foliage. Kelvin tells you the color of the light, not its strength. Foot-candles tell you how much light is actually reaching the plant. There is no universal distance between the fixture and the fern because grow lights vary considerably in output. Measure at the fronds and adjust the setup based on what is actually reaching the plant.

Water when your plant needs watered. Crocodile Fern generally prefers a more consistently moist root zone than plants that tolerate substantial dryback. Let the plant use some of its available moisture before watering thoroughly again, but avoid repeatedly allowing the entire root system to become extremely dry. At the same time, moist does not mean saturated. Use an airy mix that retains some moisture while still allowing excess water to drain and oxygen to reach the roots. Warm temperatures, moderate to higher humidity and gentle airflow can help support healthy new fronds.