Houseplant · Asparagaceae
Asparagus Fern
Asparagus aethiopicus
Soft, feathery, and effortlessly relaxed in any room you give it room to spill.
Bright indirect
Every 7–10 days
50–77°F · 10–25°C
USDA 9–11
Overview
Few houseplants soften a room the way the asparagus fern does. Its arching, feathery sprays tumble over the edge of a pot and add a loose, airy movement that flatters a shelf, a mantel, or the corner of a console. For all its fern-like grace, it is no fern at all; it belongs to the asparagus family, and those soft 'leaves' are really flattened stems called cladodes.
It is an easy companion to a busy home. It grows fast in bright indirect light and stores water in tuberous roots, so it stays handsome even when a watering slips your mind. Set it somewhere warm with a pot that drains, and it becomes a billowing green presence that pairs as well with mid-century wood as it does with a plain white sill.
There is one thing to plan around. In summer it sets tiny white flowers that ripen to bright red fruit, and those berries are the reason to place it well out of reach of pets and small children. The sap can also irritate skin, so it is worth keeping gloves nearby for the occasional tidy-up.
Care
The short version: give it bright indirect light, water once the top few centimeters dry out, feed monthly through spring and summer, and keep the berries away from pets and kids.
Light
Set it in bright indirect light for the fullest, most graceful growth. It will manage in partial shade or a little direct sun, though too little light leaves it thin and stretched, and harsh midday sun scorches the fine foliage.
Water
Keep the soil lightly moist through the growing season, then let the top few centimeters dry out before watering again. The tuberous roots store water, so a soggy pot only rots them. Ease off in winter as growth slows.
Soil
Pot it in a well-draining, fertile mix rich in organic matter. A slightly acidic pH of 6.0 to 6.8 suits it, and good drainage is what keeps the tubers from sitting wet.
Temperature
It looks its best between 50°F and 77°F (10°C to 25°C). It has no tolerance for frost, so keep it indoors or bring it in well before the first cold nights.
Humidity
Average room humidity, around 40% to 60%, keeps the foliage fresh. In very dry air the tips can brown, so group it with other plants or set it near a tray of water in an arid room.
Feeding
Feed once a month from spring through summer with a balanced water-soluble fertilizer cut to half strength. Let it rest through fall and winter with no feeding at all.
Pruning
Clip yellowed or dead stems at the base to keep the shape clean, and cut back leggy growth to coax out denser, fresher fronds. Wear gloves, since the foliage and sap can irritate skin.
Repotting
Move it up a pot size every 1 to 2 years, ideally in spring. It is asking for room when the tuberous roots push above the soil, work through the drainage holes, or begin to crack the pot.
Size & spacing
Indoors it reaches about 12 to 24 inches (30 to 60 cm) tall and spreads 24 to 35 inches (60 to 90 cm) wide, so give it space to arch and spill without crowding what sits beside it.
Troubleshooting
Most of what spoils the look of this plant comes down to water or light. Brown and crispy usually means it dried out, yellow and dropping usually means the pot stayed too wet, and pale and stretched means the spot is too dim. Match the look below, and bringing it back into shape is rarely much trouble.
Yellowing sprays letting go of needles
When a once-lush display starts to yellow and shed, the usual story is root rot from soil kept too wet, since the tuberous roots store their own water and never want to sit in a damp pot. A dim corner or the simple aging of older stems can read the same way. Let the top few centimeters dry before the next watering, move the plant somewhere with brighter indirect light, and clip the fully yellow stems at the base so it looks composed again.
Fix:
- Allow the top few centimeters of soil to dry before rewatering
- Improve drainage and ensure the pot has open holes
- Move to a brighter spot with bright indirect light
- Remove fully yellowed stems at the base
Browned, crisp sprays letting needles fall
A display that turns brown and brittle is showing drought stress, typically once the tubers have run dry, with hot dry air or strong midday sun hurrying things along. Lift the pot to be certain, since a feather-light feel over bone-dry soil tells the tale. Set it to soak from the bottom, draw it back from direct sun into softer indirect light, and trim the browned stems so the arrangement reads fresh once more.
Fix:
- Rehydrate by deep watering or bottom-soaking the pot
- Move out of harsh direct sun into bright indirect light
- Raise ambient humidity to around 40-60 percent
- Trim off browned stems
Lanky, pale stems with faded color
A thin, leggy silhouette with washed-out color means the plant is straining toward light its spot doesn't supply, and a skipped growing-season feed leaves it looking even less full. The brighter side gives it away: stems leaning toward the window confirm the room is too dim. Reposition it where the light is generous, feed monthly with diluted balanced fertilizer in spring and summer, and prune the long stems so it returns to a fuller, more flattering shape.
Fix:
- Relocate to brighter indirect light
- Feed monthly with diluted balanced fertilizer in spring and summer
- Prune leggy stems to stimulate bushier regrowth
Toxicity
This is a toxic plant, and the bright red berries are the part to plan around. They hold steroidal compounds called sapogenins that cause vomiting and stomach upset if eaten, and the sap can leave skin red and itchy after repeated contact. Place it well out of reach of pets and children, and clear away any berries that fall.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Moderate
The ASPCA flags this plant for cats, so it belongs on a shelf or stand a cat cannot reach. Eaten berries bring on vomiting, belly pain, and diarrhea, and steady brushing against the foliage can leave a cat's skin red and irritated.
Dogs Moderate
Dogs fare no better in a shared room. A mouthful of berries means vomiting and a sore stomach, while repeated contact with the sap can flare into an itchy rash.
Horses Caution
The steroidal saponins that trouble cats and dogs would unsettle a horse as well, so keep grazing animals away from the berries and foliage even though horses rarely choose the plant.
Rabbits Caution
A rabbit should never be offered any part of this plant. The saponins in the berries and stems are unsafe for so small a grazer, and there is nothing here worth the risk.
Livestock Caution
Cattle, goats, and sheep can take the same stomach upset from the saponin-laden berries and foliage, so fence it off from any pasture where they might browse.
Birds Caution
Birds eat and scatter the red berries in the wild, which is how the plant turns invasive, yet the fruit can still irritate a pet bird's gut. Keep cage birds away from it to be safe.
People Caution
No part of this plant belongs on the table, and the berries can cause stomach pain and diarrhea if a child swallows them. The sap stings bare skin as well, so wear gloves whenever you prune or repot.
Wear gloves when pruning or repotting, as the sap and foliage can trigger allergic dermatitis with repeated skin exposure.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
A handful of named forms reach garden centers, and they differ mostly in how the fronds are carried and the look they bring to a room. These are the ones worth knowing.
'Sprengeri'
The classic Sprenger's form is the one most homes keep indoors, sending out loose, arching, feathery stems that spill gracefully over the lip of a pot.
'Myersii' (foxtail fern)
For a more sculptural look, the foxtail fern trades arching sprays for dense, upright, plume-like fronds that read as a row of fox tails.
'Cwebe'
Its arching stems open with coppery-bronze new growth that settles to green with age, lending a quiet shift of tone over the season.
How to propagate
Growing your collection is simple, and the easiest way is to divide a plant you already own when you repot it in spring.
DivisionEasy
Spring, ideally at repotting time · 2 to 4 weeks
Division is the elegant, low-effort way to grow your collection, and spring at repotting time is the moment for it. Lift the whole plant, then cut or ease the tuberous clump into sections, each holding its own roots and a few stems, and pot them up separately. Every piece tends to settle and begin growing within 2 to 4 weeks, ready to fill a second pot or sit beside the first.
SeedModerate
Spring · Several weeks to germinate, months to fill out
Starting from seed is the slower, more patient path, and spring is the season to begin. With gloves on, since the fruit irritates skin, clean the seed from the ripe red berries and sow it into a warm, moist mix. Allow several weeks to germinate and several more months before the seedlings fill out, since this route comes up slower and less evenly than division.
Myths
This is an authentic fern, and spores are what it grows from.
The name and that feathery look mislead almost everyone, yet this is no fern at all. It is a flowering plant in the family Asparagaceae that makes flowers, berries, and seeds, and the soft, feathery 'leaves' are really flattened stems called cladodes.
As with a true fern, it longs for wet soil and shadowy corners.
Its tuberous roots store their own water, so it carries a dry spell far more gracefully than a true fern would. It also asks for bright indirect light, not deep shade, and a soggy pot is the surest way to lose it.