Leather Fern

Water leather fern regularly to keep the soil consistently moist but not waterlogged, reducing frequency in the winter months when growth slows. Avoid overwatering, which can lead to root rot, and always allow the top 1 inch (2.5 cm) of soil to dry out slightly between waterings for container-grown specimens.

Thrives in partial to full shade, with indirect, filtered light being ideal for both indoor and outdoor plants. Protect it from direct midday sun, which can scorch its fronds and cause unsightly brown discoloration. Indoor plants do well near north or east-facing windows that receive soft, diffused light year-round.

Prefers well-draining, loamy soil rich in organic matter, with a slightly acidic to neutral pH between 5.5 and 7.0. For potted indoor plants, use a high-quality peat-based potting mix amended with perlite or orchid bark to improve drainage and aeration. Outdoor plants benefit from a 2-inch (5 cm) layer of mulch around the base to retain moisture and regulate soil temperature.

Feed leather fern with a balanced, water-soluble fertilizer diluted to half strength once a month during the spring and summer active growing season. Avoid fertilizing in fall and winter, when the plant is dormant, as this can lead to salt buildup in the soil and damage the root system. Over-fertilization may cause frond tips to turn brown, so err on the side of underfeeding if unsure.

Grows best in temperatures between 60–75°F (15–24°C), and can tolerate short dips down to 30°F (-1°C) if planted outdoors in USDA hardiness zones 9 to 11. Indoor plants should be kept away from cold drafts from windows, doors, or air conditioning units, as sudden temperature fluctuations can cause frond drop. Prolonged exposure to temperatures below 25°F (-4°C) will kill the above-ground growth, though the rhizomes may resprout in spring if well-mulched.

Remove any brown, yellowed, or damaged fronds at the base with clean, sharp pruning shears as needed to maintain a tidy appearance and encourage new growth. Pruning is best done in early spring before new fronds emerge, but light trimming can be done any time of year. Cut back entire fronds to the soil line if they become too large or unsightly, as the plant will quickly produce new growth from its rhizomes.

The easiest method of propagation is division of mature clumps in early spring, before new growth begins. Carefully dig up the entire plant, gently separate the rhizome into sections with at least 2–3 healthy fronds and a portion of the root system attached, then replant each section at the same depth it was originally growing. Spores can also be collected from the undersides of mature fronds and sown on sterile potting mix, though this method is slower and more labor-intensive than division.

Prefers moderate to high humidity levels between 50% and 80%, though it is more tolerant of dry air than many other fern species. For indoor plants in dry environments, mist the fronds 2–3 times a week, place the pot on a tray filled with pebbles and water, or use a room humidifier to boost ambient humidity. Low humidity may cause frond edges to turn brown, but the plant will usually recover once humidity levels are increased.

Repot container-grown leather fern every 2–3 years in early spring, or when roots begin to grow out of the drainage holes at the bottom of the pot. Choose a pot that is 1–2 inches (2.5–5 cm) larger in diameter than the current one, and ensure it has adequate drainage holes to prevent waterlogging. When repotting, gently loosen the root ball, remove any dead or rotting roots, and add fresh potting mix around the plant, pressing lightly to secure it in place.