Houseplant · Arecaceae
Fishtail Palm
Caryota mitis
A bold indoor palm with ragged leaflets shaped like a fish's tail, striking up close but prickly once it fruits.
Bright indirect
Every 7–14 days
55–84°F · 13–29°C
USDA 9–11
Overview
Look closely at this palm and the name explains itself: each leaflet is frayed and jagged at the tip, torn off at an angle like the back fin of a fish. Those leaflets sit on twice-divided fronds, so the leaf splits, then splits again, layering green over green into a soft, full look rather than a few stiff blades.
It grows as a clumping, multi-stemmed palm instead of one bare trunk. New shoots and suckers keep pushing up from the base, so the plant thickens into a leafy column, packed and busy from the floor upward. Kept indoors it tends to settle somewhere between 6 and 10 feet (1.8 to 3 m) tall.
In summer the clump pushes out purplish flowers that open top-to-bottom down a stem, working their way from the crown toward the base. Small reddish-black berries follow. Those berries are where the catch hides: they carry needle-like calcium oxalate crystals that burn and itch the moment they meet bare skin.
Care
The short version: give it bright indirect light, water once the top half of the soil has dried, keep it warm, and feed monthly through the growing season. The one habit to learn: wear gloves when handling the fruit, since the berries sting bare skin.
Light
Set it near a window with bright indirect light, the kind that is filtered rather than blasting straight onto the leaflets. It will hold on in medium light and put up with a little shade, but in a brighter spot the fronds come in fuller and faster, layering that twice-divided look more densely.
Water
Soak it well while it is actively growing, then wait until the top half of the soil dries before the next drink, which usually lands every 7 to 14 days. Ease right off in winter and water sparingly. The roots want soil that stays evenly moist but never waterlogged, so good drainage matters.
Soil
Plant it in a rich, loam-based potting mix that drains freely and never holds standing water around the roots. It is forgiving about texture and takes clay, loam, and sand in stride. Aim for a soil pH between 6.0 to 8.0.
Temperature
Keep it in the 55°F to 84°F (13°C to 29°C) band, the warm range it grows best in. It has no tolerance for cold drafts or frost, so in winter pull it back from chilly window glass and any door that lets a draft through.
Humidity
Ordinary room humidity is enough, though the palm is happier with more moisture in the air. Dry indoor air is the opening spider mites wait for, leaving the leaflets stippled and dull. A quick misting or a humidity tray takes the edge off through the dry winter months.
Feeding
Feed it monthly through spring and summer with a balanced palm fertilizer while it is actively pushing out new fronds and suckers. Once the cooler months arrive and growth slows, stop feeding and let it rest.
Pruning
Pruning is light work: snip off dead or damaged fronds as they appear. When one stem finishes flowering and dies back, cut that spent stem out at the base to clear room for the fresh suckers crowding in behind it.
Repotting
Move it into a larger pot every 2 to 3 years, or sooner if it is crowded. The tells are roots circling the bottom or poking from the drainage holes, soil that dries out very fast, and growth that stalls while the stems pack the pot tight.
Size & spacing
Indoors it reaches 6 to 10 feet (1.8 to 3 m) tall with a spread of 3 to 5 feet (90 to 150 cm). Give it floor space and clearance overhead, since the arching fronds need room to spread without scraping a wall or ceiling.
Troubleshooting
Two situations cover most of the worry around this palm: a stem that dies off after it flowers, which is normal, and pests that move in when the air dries out, which you can fix. Match what you are actually seeing before you reach for any treatment.
Stippled, speckled leaflets wrapped in fine webbing
Warm, dry indoor air is exactly what spider mites wait for, and they rank among the worst pests this palm faces inside. Turn the leaflets over and look for tiny moving dots and faint webbing, with stippling and yellow speckling spreading across the surface above. Rinse or wipe the foliage, raise the humidity, and treat with insecticidal soap or horticultural oil if they hang on.
Fix:
- Rinse or wipe foliage to dislodge mites
- Raise humidity around the plant
- Treat with insecticidal soap or horticultural oil as needed
A whole stem yellows and collapses after it flowers
When a full stem yellows from top to bottom and falls apart after blooming, that is monocarpic flowering doing exactly what it is built to do, not a disease taking hold. Each stem blooms once, working top-down, sets its reddish-black berries, then dies on schedule. Cut the spent stem out at the base, and the basal suckers carry the clump forward.
Fix:
- Cut the spent stem out at the base once it has fully died
- Allow the surviving suckers to take over the clump
Toxicity
The leaves are generally safe to touch and handle; the hazard sits in the fruit and the sap. Both carry sharp calcium oxalate crystals that sting the skin, mouth, and throat of people and pets alike. No part is safe to eat. Keep the ripe berries away from children and animals, and wear gloves when cleaning them off seeds.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
A cat that bites the fruit or sap gets a burning mouth, drools heavily, and paws at its face; the lips and tongue may swell and it usually goes off its food.
Dogs Toxic
Dogs that chew the berries start drooling with obvious mouth pain and retching; some vomit or skip meals afterward.
Horses Caution
Horses rarely encounter it, but the oxalate fruit burns the mouth and lips, brings on drooling, and leaves them reluctant to graze; keep fallen fruit out of reach.
Rabbits Toxic
For rabbits the result is stinging pain in the mouth, drooling, and a flat refusal to eat; never offer any part of the plant.
Livestock Caution
Livestock that mouth the fruit feel a painful sting and swelling and are put off after a single taste; fence them away from any browse.
Birds Caution
The irritant crystals make the fruit a poor and risky snack for birds; pecking at broken berries irritates the beak and mouth, so treat it as off-limits.
People Caution
No part is safe to eat, and handling crushed fruit can burn and itch the skin for hours; wear gloves when cleaning the berries off seeds and keep the fruit away from children.
Wear gloves when handling the ripe fruit / cleaning seeds, as the calcium oxalate causes painful skin irritation and itching.
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
There is just one plant to know here. It is grown as the straight species, with no named cultivars to sort through.
Caryota mitis (species)
This is the clumping, multi-stemmed fishtail palm whose ragged, twice-divided leaflets are torn off at the tip like a fish's tail, and it renews itself endlessly from the basal suckers rising around its feet.
How to propagate
There are two ways to make more, and one is far quicker than the other. Dividing the clump is fast, while starting from seed is a long game.
DivisionModerate
Spring to summer during active growth · Several weeks to a few months for divided suckers to root and resume growth
Its clumping habit makes this the easiest way to make new plants. Lift the clump in spring or summer and split the suckers away from around the base. Each division takes a few weeks to a few months to root and pick its growth back up.
SeedModerate
When ripe fruit is available; sow fresh seed · Germination can take several weeks to months, then years to reach size
Sow fresh seed whenever ripe fruit is on hand, and wear gloves cleaning the pulp, since the calcium oxalate burns and itches. This is the slower route: germination runs several weeks to months, then years to reach size.
Myths
A yellowing, collapsing trunk means the whole palm is dying or diseased.
Each stem only flowers once, sets fruit, and then dies on its own; the clump carries right on through fresh basal suckers rising from the base. This is normal monocarpic behavior, not a problem. Cut the spent trunk out and let the new growth take its place.
Like parlor and areca palms, the fishtail palm is harmless to touch.
Its fruit is packed with needle-like calcium oxalate crystals that sting the skin and set off itching the moment you handle a broken berry. Wear gloves around the ripe fruit. This one is not in the same safe company as those other palms.