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Plant care

Regal Staghorn Fern (Regal Elkhorn Fern) care

Platycerium grande

Also called Regal Elkhorn Fern, Grand Staghorn Fern, Large Staghorn Fern.

RHS H1bUSDA 10-12Pet-safeIndoor Fertile fronds to 1.5 m

Watering rhythm

7-14days

When the shield fronds feel dry to the touch or the mounted board is very light, soak every 7-14 days

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Light

Bright indirect light (just back from a sunny window)

Soil

Mounted on a board with sphagnum moss backing; no traditional soil required

Humidity

50-70%

Temp

16-30°C

Pet safety

Pet-safe

Mature size

Fertile fronds to 1.5 m

Care at a glance

Light

Bright but filtered. Regal Staghorn Fern burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Requires bright, diffuse light to support the growth of its large fronds. Near a sunny window with a sheer curtain, or 1-2 m from a south- or west-facing window is ideal. Avoid dim conditions which slow growth considerably. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering regal staghorn fern: when the shield fronds feel dry to the touch or the mounted board is very light, soak every 7-14 days. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Soak the entire mount in a tub of water for 10-20 minutes, then allow to drain and dry before re-hanging. Never allow the plant to sit in standing water. In winter, extend the interval to 2-3 weeks.

Soil and pot

Regal Staghorn Fern grows best in mounted on a board with sphagnum moss backing; no traditional soil required. Mount on a thick slab of rot-resistant hardwood or cork bark with a generous pad of long-fibre sphagnum moss behind the shield fronds. Secure with fishing line or plant-safe ties until the shield fronds grip the mount. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Regal Staghorn Fern sits happiest at around 50-70% humidity and 16-30°C (60-86°F). Moderate to high humidity supports healthy frond development. Mist the back of the mount and the green fronds in dry weather. Avoid wetting the shield (brown basal) fronds as these are protective structures. If you keep the room above 16 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed regal staghorn fern sparingly. Feed monthly during the growing season by soaking in dilute balanced fertiliser solution or tucking a banana skin or slow-release granules behind the shield frond. Avoid liquid fertiliser directly on shield fronds. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on regal staghorn fern in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Brown shield fronds — Shield fronds naturally turn brown as they age and dry — this is normal protective ageing. Do not remove them as they anchor the plant and channel nutrients.
  • Overwatering / frond rot — Soaking too frequently or keeping the mount constantly wet causes crown rot. Allow the mount to dry well between waterings.
  • Scale insects — Can colonise the underside of fronds; treat with insecticidal soap applied carefully to avoid wetting shield fronds.
  • Slow growth — P. grande is naturally one of the slower-growing staghorns. Ensure bright light and adequate humidity; expect years to mature.
  • Frond tip browning — Low humidity or insufficient watering. Soak more frequently in hot weather and mist the fertile fronds.

Companion plants

Regal Staghorn Fern pairs well with Platycerium bifurcatum, Hoya latifolia, and Tillandsia xerographica. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Harvest pups (offshoots) that develop alongside the main shield fronds and mount them individually on small boards with sphagnum moss. Spore propagation is very slow and challenging. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Regal Staghorn Fern is pet-safe. Platycerium (staghorn ferns) are true ferns (Polypodiaceae) and are generally listed as non-toxic to cats and dogs by the ASPCA. No toxic compounds have been documented for this genus. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Regal Staghorn Fern care — frequently asked questions

What is the common name for Platycerium grande?

Platycerium grande is most commonly called Regal Staghorn Fern, but it is also known as Regal Elkhorn Fern, Grand Staghorn Fern, Large Staghorn Fern. The names refer to the same species, so care instructions for Regal Staghorn Fern apply identically to anything sold as Regal Elkhorn Fern.

How much light does regal staghorn fern need?

Regal Staghorn Fern grows best in bright indirect light (just back from a sunny window). Requires bright, diffuse light to support the growth of its large fronds. Near a sunny window with a sheer curtain, or 1-2 m from a south- or west-facing window is ideal. Avoid dim conditions which slow growth considerably.

How often should I water regal staghorn fern?

Water regal staghorn fern when the shield fronds feel dry to the touch or the mounted board is very light, soak every 7-14 days. Soak the entire mount in a tub of water for 10-20 minutes, then allow to drain and dry before re-hanging. Never allow the plant to sit in standing water. In winter, extend the interval to 2-3 weeks. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is regal staghorn fern toxic to cats and dogs?

Regal Staghorn Fern is pet-safe. Platycerium (staghorn ferns) are true ferns (Polypodiaceae) and are generally listed as non-toxic to cats and dogs by the ASPCA. No toxic compounds have been documented for this genus.

What USDA hardiness zone does regal staghorn fern grow in?

Regal Staghorn Fern is rated for USDA zone 10-12 (indoor-only in most US homes) and RHS hardiness H1b. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Regal Staghorn Fern deep-dive guides

Every aspect of regal staghorn fern care, each with its own calibrated guide:

Featured in these plant shortlists

Regal Staghorn Fern qualifies for 9 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Regal Staghorn Fern is also known as Regal Elkhorn Fern, Grand Staghorn Fern, and Large Staghorn Fern.