Staghorn fern

Elkhorn fern (Australian)

Larger, more dramatic relative from the same genus. Single huge specimen plant rather than a clumping clump-former like P. bifurcatum. Shield fronds can reach 1 m+ across. Often confused on plant labels.

Giant elkhorn

Philippine endangered relative; very large; only one fertile frond type. Almost never the species sold at non-specialist garden centres despite the label sometimes saying so.

Bright indirect light to a few hours of filtered morning sun.

Native habitat is the high tropical canopy where direct sun is filtered through leaves above. East-facing windows are ideal. South or west windows work behind a sheer curtain. Direct unfiltered noon sun bleaches the fronds. Light too low and the plant produces only soft elongated fertile fronds that hang limply rather than holding their antler shape.

Seasonal: Nordic latitudes above ~55°N: an unobstructed east window is enough through summer; supplement with a grow light in November–February if growth stalls.

Dunk the mount in a basin of water for 5–10 minutes weekly; drain fully before rehanging.

Mounted staghorn ferns cannot be watered the way potted plants are. The traditional method is to lift the entire mount off the wall, lay it in a basin or sink, fill the sink with tepid water until the moss/sphagnum behind the shield fronds is fully soaked, leave for 5–10 minutes, then drain thoroughly before rehanging. In summer or with low humidity, this might be twice a week; in winter, once every 10–14 days. The shield fronds should never be sopping wet between waterings — they will rot.

Seasonal: Reduce dunking frequency by half in winter when growth slows. Wait until shield fronds feel slightly dry to the touch before next watering.

Mounted on a wooden board with a sphagnum moss pad — no soil.

Traditional mounting: a hardwood board (cedar or oak), a hand-sized pad of damp sphagnum moss in the centre, and the bare-rooted fern pressed against the moss with the shield fronds outward. Secure with fishing line, copper wire, or pantyhose strips wrapped around the board until shield fronds grow over the fastenings (usually within 1–2 years). Alternative: a wire basket lined with moss for a more naturalistic 'tree-bracket' look. Never plant in regular potting soil — the rhizome will rot.

60–80 % preferred; tolerates 40 % briefly with regular dunking.

Native canopy humidity is high. Indoor humidity below 40 % causes browning frond tips and slow growth. A bathroom or kitchen mount is often ideal. Misting the antler fronds 2–3 times weekly helps in dry winter conditions, but the white wax coating means you should mist briefly and let dry — sustained wetness on the fronds invites fungal spotting.

16–27 °C; intolerant of frost.

Subtropical species — tolerates a wide range above 12 °C but never frost. Indoor temperatures in heated homes are perfect. A summer hang on a shaded balcony from June–September gives a dramatic growth boost; bring inside before the first cold snap.

Quarter-strength balanced feed in the dunking water monthly during spring and summer.

Drop liquid balanced fertiliser (e.g. 10-10-10) into the dunking basin at quarter strength once a month from April to September. Some growers tuck a banana peel behind the shield fronds twice a year — the high potassium content is genuinely beneficial and the peel decomposes harmlessly. Skip feeding in winter.

Re-mount onto a larger board every 5–10 years, or when the original board is overgrown.

Staghorns are not repotted; they are re-mounted. Lift the plant carefully from the old board (it will have grown directly into the wood), refresh the sphagnum behind it, and remount onto a larger board. Best timing is late spring. Most plants only need this every decade — these are slow patient growers.

No reported toxicity. Platycerium has no documented poisoning cases in humans.

ASPCA classifies staghorn fern (Platycerium bifurcatum) as non-toxic to cats. No oral irritation, no systemic toxicity reported. Safe for cat households.

ASPCA classifies staghorn fern as non-toxic to dogs. Safe for dog households.