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elkhorn fern (Platycerium bifurcatum)

Platycerium bifurcatum is an evergreen perennial epiphytic fern with short, creeping, branching rhizomes that can form colonies from lateral buds. It is generally reported to form colonies and to be a cultivar.

LightSources differ in describing suitable light, ranging from bright indirect or filtered light to partial sun or partial shade, with shading advised under intense summer light. Platycerium bifurcatum tolerates some direct s
WaterWater thoroughly during active growth while maintaining good drainage, allowing the growing medium to dry briefly or slightly between waterings without letting the roots dry completely; reduce watering in winter and keep
HumidityPlatycerium bifurcatum prefers high humidity. It is generally reported to need good airflow.
TemperatureSources differ on the minimum temperature associated with cultivation, while other sources describe the plant as sensitive to cold. It is generally reported to tolerate brief light frost. It is not very sensitive to heat
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Overview

Platycerium bifurcatum is an evergreen perennial epiphytic fern with short, creeping, branching rhizomes that can form colonies from lateral buds. It is generally reported to form colonies and to be a cultivar.

Origin and habitat

Sources differ on its native range, describing Australia, New Guinea, Indonesia and the Sunda Islands, parts of the western Pacific, including New Caledonia. It occurs mainly as an epiphyte on tree trunks and branches in or near tropical rainforest, with records of growth on exposed rocks. It is associated with tropical to warm, humid conditions and higher humidity, and needs protection from cold or frost.

Characteristics

Mature plants reach 50–100 cm in height and 50–100 cm in spread. Growth is faster when water is plentiful, and lateral buds form more readily; Platycerium bifurcatum is also described as one of the faster-growing staghorn ferns. The sterile shield fronds are rounded to heart-shaped, overlap against the growing surface, cover the root crown, commonly turn brown when mature, and can trap fallen leaves and other organic matter. The gray-green fertile fronds range from semi-erect to drooping, have narrower bases and repeated forked divisions, and bear spore-producing areas on the backs of their terminal lobes; some sources also describe them as relatively stiff.

Light

Sources differ in describing suitable light, ranging from bright indirect or filtered light to partial sun or partial shade, with shading advised under intense summer light. Platycerium bifurcatum tolerates some direct sun.

Watering

Water thoroughly during active growth while maintaining good drainage, allowing the growing medium to dry briefly or slightly between waterings without letting the roots dry completely; reduce watering in winter and keep slightly dry. A single source reports summer watering at about every 2–3 days, so sources are few for this interval. Winter watering is given as every 14 days.

Humidity and airflow

Platycerium bifurcatum prefers high humidity. It is generally reported to need good airflow.

Temperature and dormancy

Sources differ on the minimum temperature associated with cultivation, while other sources describe the plant as sensitive to cold. It is generally reported to tolerate brief light frost. It is not very sensitive to heat, although a single source reports an upper temperature limit. Sources place it within warm USDA hardiness classifications and also describe outdoor cultivation in one of those warm zones.

Growing medium and mounting

For epiphytic cultivation, water-retentive but well-drained materials such as sphagnum moss or epiphytic orchid medium are suitable; potted plants can use a humus-rich, well-drained medium, and loam is also listed. Platycerium bifurcatum grows on trees as an epiphyte and can be mounted, grown in a basket or potted.

Feeding

Sources differ on feeding: balanced liquid fertilizer may be used during the growing season with less feeding in winter, while another source describes using slow-release fertilizer on a yearly schedule.

Propagation

Propagation can be by spores, by separating offsets or young plants, or by dividing large colonies. It often produces offsets. Spores are produced in brown patches on the backs of the terminal portions of fertile fronds.

Common problems

Scale insects are reported as pests, and genus-level care sources also mention mealybugs. Sources differ on disease problems: anthracnose is reported, while another source describes disease problems as generally uncommon. Overwatering may lead to root rot, while insufficient water may cause brown or curled frond tips; browning of mature shield fronds is part of their normal life cycle and does not by itself indicate disease. The plant is sensitive to frost and low temperatures and needs warmth in winter; during hot periods, good airflow and protection from excessively strong sunlight are important.

Identification

The most conspicuous combination is that of sterile shield fronds and antler-like, forked fertile fronds; the fertile fronds divide repeatedly and develop brown spore areas near their tips on the underside, while the shield fronds lie against the growing surface and collect organic debris.

Photos

Platycerium bifurcatum
📷 themaskedlapwing · CC0 · source
Platycerium bifurcatum
📷 Leon Perrie, some rights reserved (CC BY), uploaded by Leon · CC BY · source
Platycerium bifurcatum
📷 no rights reserved, uploaded by Jean-Paul Boerekamps · CC0 · source

Sources