Why Plants Die
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Bird's nest fern

Asplenium nidus, Aspleniaceae

Sources last read 14 September 2026.

Middling It gives warning, with time to act.

Also called Hawai'I birdnest fern and Nest Fern.

Bird's nest fern (Asplenium nidus), the whole plant.
Wee Hong, CC BY-SA 4.0 · Wikimedia Commons

Toxicity is partly unassessed

  • Not assessed for cats. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for dogs. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
  • Not assessed for people. RHS publishes no harm statement for this plant. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.

What the sources say about its care

Light
Partial shade
RHS · read 13 September 2026
Water
Moist but well-drained
RHS · read 13 September 2026
Humidity

No source read publishes a humidity figure for any plant on this site. What follows is general guidance for foliage plants.

ASHRAE recommends indoor relative humidity between 30% and 60% 30–60%
Penn State Extension · read 13 September 2026
Temperature

How cold this tolerates, not what it prefers. No source read for this site publishes a preferred range for a plant indoors.

H1B — 10–15°C 10–15 °C
RHS · read 13 September 2026
Soil
Loam; pH Acid or Neutral
RHS · read 13 September 2026
Toxic to cats
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Toxic to dogs
Not on the ASPCA list. That is not a finding of safety.
ASPCA · read 13 September 2026
Harmful to people
No statement of harm to people is published for this plant; that absence is not evidence it is safe.
RHS · read 13 September 2026

How it usually goes wrong

Crisp margins that appear in winter

The bird's nest fern shows browning on many blades at once, all at the margin, with no spots or soft patches anywhere.

Leaf margins are the end of the water supply, so they are the first tissue to run short when the air takes more than the roots can send. Penn State Extension cites 30% to 60% as the recommended indoor range, and a heated room in winter sits below it.

Telling it apart: Look at the pot rim and the soil surface. A white crust points at a build-up from tap water or feed rather than at the air. Penn State also reports misting and pebble trays do little to the humidity around a plant.

Penn State ExtensionBird's nest fern brown leaf tips and edges: causes
The clump grows thin and sparse, and leans

Older blades on the bird's nest fern keep their colour while each new one comes in thinner, with a longer stretch of bare stem below it.

Placed darker than the partial shade its source describes, the plant invests in length rather than leaf, because length is what finds a window.

Telling it apart: Spacing. A plant short of light stretches; one short of nitrogen keeps its spacing and only loses colour.

RHSBird's nest fern leggy, leaning growth: causes
Yellowing that begins at the outermost blades

Whole blades yellow at once rather than browning at a margin, and the bird's nest fern looks deflated despite soil that has not dried since it was watered.

Its source describes soil that is moist but well-drained. Roots held below that are short of air, and roots short of air stop moving water, so the clump wilts in a wet pot.

Telling it apart: Whether new growth is affected too. Root damage shows up everywhere at once; ordinary leaf loss shows only in the oldest leaves.

RHSBird's nest fern leaves turning yellow: causes

Not sure which it is? Ask the diagnosis questions for Bird's nest fern.

Routine care

Watering
A pebble tray with water may be needed for enough humidity.
NC State Extension · read 13 September 2026
Keep the compost moist without letting it get soggy, and feed monthly from May to August with a general liquid fertiliser at half strength.
RHS · read 13 September 2026
Feeding
Its rosette of fronds is shaped like a funnel and collects fallen leaves and other debris, making a compost that nourishes the plant. While it is actively growing, a monthly dose of dilute liquid fertilizer may help.
NC State Extension · read 13 September 2026
Keep the compost moist without it becoming soggy, and from May to August give a general liquid fertiliser at half strength each month.
RHS · read 13 September 2026
Propagation
Increase by division, or sow spores at 21°C once ripe.
RHS · read 13 September 2026
Pruning
Remove dead or damaged fronds when needed.
RHS · read 13 September 2026
Pests and diseases
Scale insects can attack it. Disease is uncommon.
RHS · read 13 September 2026

Move something and watch

Loading the simulator. It needs JavaScript; the care table above does not.

Close view of Bird's nest fern (Asplenium nidus) foliage.
Close upDavid J, CC BY-SA 4.0 · Wikimedia Commons
Bird's nest fern (Asplenium nidus) growing in a pot.
In a potForest and Kim Starr, CC BY 3.0 us · Wikimedia Commons

About the plant

Asplenium nidus is an epiphytic species of fern in the family Aspleniaceae, native to tropical southeastern Asia, eastern Australia, Hawaii, Polynesia, Christmas Island, India, and eastern Africa. It is known by the common names bird's-nest fern or simply nest fern.

From Wikipedia, CC BY-SA 4.0 · read 13 September 2026

Native range
Malesia to N. & NE. Queensland
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Polynesia, HI, SE Asia, Australia, Madagascar
NC State Extension · read 13 September 2026
Old World Tropics
RHS · read 13 September 2026
Climate
wet tropical
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Growth form
epiphyte or lithophyte
World Checklist of Vascular Plants, June 2026 release, CC BY.
Kew WCVP · read 13 September 2026
Epiphyte, Fern; habit arching, erect, rounded
NC State Extension · read 13 September 2026
Tufted, Clump forming (evergreen)
RHS · read 13 September 2026
Size
Height 36–60 in; width 24–36 in
NC State Extension · read 13 September 2026
Height 1-1.5 metres; spread 0.5-1 metres after 5–10 years
RHS · read 13 September 2026
Flowering
No flowers.
NC State Extension · read 13 September 2026

Common problems with Bird's nest fern

Other Asplenium

More of the Aspleniaceae family

Plants with similar care

Sources

What this does not cover

The figures above are what published sources say, not measurements of the plant in your room. They say nothing about your pot size, your water, the season, or how far from the glass the plant stands, and those decide more than any figure here does.

Humidity has no species figure because no source read for this site publishes one, and the only temperature published for this plant is a cold floor. The simulator fills those gaps with general figures for its kind of plant, marked as general and listed on how we read sources. Where a toxicity row says the plant was not assessed, that is the absence of a finding and not a finding of safety.

If something is already wrong, the diagnosis tool asks about the soil, the window and the watering, which is where the answer usually is.