Asparagus fern
Sources last read 14 September 2026.
Middling It gives warning, with time to act.
Also called Climbing Asparagus, Common Asparagus Fern, Emerald asparagus fern, Feathered Asparagus Fern, feathery asparagus, Ferny Asparagus, lace fern and Plumosa Fern.
Asparagus fern is toxic
- 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.
- Toxic to people. Can cause skin allergy; the fruits are harmful when eaten. Use gloves and protective gear when handling it. RHS
What the sources say about its care
- Light
- Medium light 100–150 fcClemson Extension · read 13 September 2026Partial shadeRHS · read 13 September 2026
- Water
- Moist but well-drained or Well-drainedRHS · 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.
H2 — 1–5°C 1–5 °CRHS · read 13 September 2026- Soil
- Chalk, Clay, Loam, Sand; pH Acid or Alkaline or NeutralRHS · 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
- Can cause skin allergy; the fruits are harmful when eaten. Use gloves and protective gear when handling it.RHS · read 13 September 2026
How it usually goes wrong
- Brown brittle margins with a green centre
The asparagus fern shows browning on many fronds 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: Whether it crumbles or smears. Crisp is water lost; soft and dark is cold or rot.
Penn State ExtensionAsparagus fern brown leaf tips and edges: causes- Pale, undersized fronds at the tips of the stems
Older fronds on the asparagus fern keep their colour while each new one comes in thinner, with a longer stretch of bare stem below it.
Placed darker than the medium light its source describes, the plant invests in length rather than leaf, because length is what finds a window.
Telling it apart: Turn the pot and wait a fortnight. New growth that swings back toward the window is answering a light question.
Clemson ExtensionAsparagus fern leaves turning yellow: causes- Yellow, limp fronds at the base
The asparagus fern yellows from the base up. Affected fronds bend rather than snap, and the pot is still heavy several days after watering.
Soil described as moist but well-drained or well-drained is a drainage instruction as much as a watering one. Compost that stays saturated suffocates the fine roots that do the drinking.
Telling it apart: The soil, not the leaf. Wet compost under yellowing leaves points one way and dry compost the other, and the leaves alone will not tell you which.
RHSAsparagus fern leaves turning yellow: causes
Not sure which it is? Ask the diagnosis questions for Asparagus fern.
Routine care
- Watering
- Needles may yellow and fall if light or water is lacking. Humidity can be raised with a humidifier or by standing the container on a tray of pebbles and water.NC State Extension · read 13 September 2026Between spring and mid-autumn, water generously; in winter water less.RHS · read 13 September 2026
- Repotting
- Move to a larger pot in spring.RHS · read 13 September 2026
- Propagation
- Division or seed works best for propagation.NC State Extension · read 13 September 2026Sow seed in early spring or autumn; it germinates at 16°C (61°F). Division is done in early spring.RHS · read 13 September 2026
- Pruning
- If pruning is needed, cut stems right back to the root instead of only shortening them.NC State Extension · read 13 September 2026Pruning is not needed.RHS · read 13 September 2026
- Pests and diseases
- Can be troubled by aphids.NC State Extension · read 13 September 2026Can be troubled by snails, slugs and asparagus beetle. Diseases: usually none.RHS · read 13 September 2026
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Photographs
About the plant
Asparagus setaceus, with the common names of common asparagus fern, asparagus grass, lace fern, climbing asparagus, or ferny asparagus, is a plant in the family Asparagaceae native to southern Africa. Despite its common name, the plant is not a true fern, but has leaves that resemble one.
From Wikipedia, CC BY-SA 4.0 · read 13 September 2026
- Native range
- C. Ethiopia to S. Africa, ComorosWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026Central Ethiopia to South Africa, ComorosNC State Extension · read 13 September 2026South and East AfricaRHS · read 13 September 2026
- Climate
- seasonally dry tropicalWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026
- Growth form
- scrambling perennialWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026Ground Cover, Perennial; habit arching, climbing, erect, spreadingNC State Extension · read 13 September 2026Climbing (evergreen)RHS · read 13 September 2026
- Size
- Height 24–36 in; width 24–36 inNC State Extension · read 13 September 2026Height 1.5-2.5 metres; spread 0.1-0.5 metres after 2–5 yearsRHS · read 13 September 2026
- Flowering
- Flowers white; blooms in summerNC State Extension · read 13 September 2026Flowers white in summerRHS · read 13 September 2026
- Uses
What sources record people using this plant for. A traditional or medicinal use listed here is a record of use, not advice to eat it or treat anything with it.
Used as a medicine for various disorders and as a poison. Its berries are poisonous.NC State Extension · read 13 September 2026
Common problems with Asparagus fern
Other Asparagus
More of the Asparagaceae family
Cast iron plantBlade tips go crisp and brown
DracaenaBrown tips on the newest blades first
HyacinthFlowering stops while the foliage carries on
Lucky bambooCrisp margins that appear in winter
Ponytail palmBlades hang and feel thin between the fingers
Snake plantBlades hang and feel thin between the fingers
Plants with similar care
Sources
- ASPCA · read 13 September 2026
- Clemson Extension · read 13 September 2026
- Kew WCVP · read 13 September 2026
- NC State Extension · read 13 September 2026
- Penn State Extension · read 13 September 2026
- RHS · read 13 September 2026
- Wikipedia · read 13 September 2026
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.