Staghorn Fern Care: Mounting, Watering and Light for Platycerium

Staghorn fern care looks intimidating because the plant looks so unusual. Platycerium bifurcatum, the most common species indoors, is an epiphyte: in the forests of Australia, New Guinea and Java it grows on tree trunks and branches, not in the ground. It has two kinds of fronds. Flat, round shield fronds clasp the support and protect the roots. Long, forked antler fronds reach out and produce spores.

Indoors, it wants bright, filtered light, a good soak every week or two and air around its roots. Once you've got its watering rhythm, it's easier than many ferns.

Staghorn fern care at a glance

Understanding the two frond types

Brown shield fronds worry beginners, but they're doing their job. New green shields grow over the old ones each year.

Light

Staghorns like bright, filtered light like the dappled light of a tree canopy. Good indoor spots:

• Close to an east window with gentle morning sun.
• A metre or so back from a south or west window, or behind a sheer curtain.
• A bright bathroom with a window. See bathroom plants.

Direct midday sun scorches and bleaches the fronds. In low light, the antler fronds grow long and floppy instead of firm and upright. Check your light with the plant light meter converter.

How to water a staghorn fern

Mounted plants (best method: soaking):

1. Take the mount down and place it face down in a sink or tub of room-temperature water so the root ball and shields are submerged.
2. Soak for 10 to 20 minutes.
3. Lift it out and let it drip until it stops, then rehang.
4. Repeat when the moss or root ball feels dry and the mount feels light, usually every one to two weeks in summer and every two to three weeks in winter.

Between soaks you can mist the antler fronds and moss lightly in dry weather, but misting doesn't replace soaking.

Potted or basket plants: water thoroughly when the top of the medium feels dry, then let it drain completely.

The main risk is constant wetness, which rots the base. Black or brown soggy patches at the base of shield fronds and a sour smell are warning signs. Drooping, slightly wrinkled antler fronds and a very light mount mean thirst. For more on watering methods, see how to water houseplants and set reminders with the plant watering schedule.

Mounting a staghorn fern

Mounting suits the plant's natural habit and shows off the fronds.

You'll need: a board of untreated cedar or other rot-resistant wood, or a cork slab; long-fibre sphagnum moss; screws or nails; and fishing line or plastic-coated garden wire.

1. Soak the sphagnum moss.
2. Fix two or three screws or nails in a circle on the board, slightly larger than the plant's root ball.
3. Pile a mound of wet sphagnum in the centre.
4. Take the plant out of its pot, remove most of the compost and set the root ball on the moss so the shield fronds sit flat against the board. Place antler fronds pointing up and out.
5. Add more moss around the root ball.
6. Wind fishing line between the screws over the root ball in a criss-cross to hold it firmly. Avoid wrapping over the growing point at the centre.
7. Hang in bright, indirect light, and soak as above.

Within a year, new shield fronds grow over the line and the moss, holding the plant to the board permanently.

Growing in a basket or pot

Young plants grow well in a small pot or hanging basket filled with a mix of orchid bark and sphagnum moss, or orchid bark with a little perlite. Drainage must be excellent. Ordinary compost holds too much water and rots the roots. As the plant matures, mount it or move it to a wire basket lined with moss.

Humidity and temperature

Aim for 50 percent humidity or more. Staghorns tolerate average indoor humidity better than maidenhair ferns, but very dry, heated air browns frond tips. A humidifier helps; check your room with the plant humidity checker.

P. bifurcatum tolerates cool rooms down to about 10 °C and short spells lower. Most other species, such as P. superbum and P. grande, need it warmer, ideally above 15 °C.

Feeding

Feed once a month from spring to late summer with a balanced liquid fertiliser at half strength. Add it to the soaking water or pour it over the moss. Stop in winter. Some growers tuck a banana skin behind the shield fronds as a slow potassium feed; it's traditional, but it can attract fruit flies indoors, so a measured liquid feed is cleaner. Use the fertilizer dilution calculator.

Spores and pups

Brown, velvety patches under the tips of antler fronds are spores. They're not a disease. Growing from spores is slow.

P. bifurcatum also produces pups, small new plants with their own shield fronds, around the base. To separate one:

1. Wait until the pup has at least two or three antler fronds and its own shields.
2. Cut it free with a sharp knife, keeping some roots.
3. Mount it on a small board with moss, or pot in an airy bark mix.
4. Keep humid and bright for a few weeks while it establishes.

See how to propagate houseplants.

Common problems

Don't rub the fronds to clean them. The white fuzz (trichomes) protects the leaf.

Pet safety

Staghorn fern is listed as non-toxic to cats and dogs. Mounting it on a wall also keeps it out of reach of chewing pets. See pet-safe houseplants and check other plants with the plant toxicity checker.

Quick checklist

• ☐ Bright, filtered light; no midday sun
• ☐ Soak the mount every 1–2 weeks; let it dry slightly between soaks
• ☐ Leave brown shield fronds in place
• ☐ 50%+ humidity if possible
• ☐ Half-strength feed monthly in summer
• ☐ Don't wipe off the white fuzz

Sources and further reading

• NC State Extension Gardener Plant Toolbox: Platycerium bifurcatum, for growth habit.
• University of Florida IFAS Extension: Staghorn Ferns at a Glance, for mounting, watering and species.
• ASPCA Toxic and Non-Toxic Plants: Staghorn Fern, for pet safety.