Houseplant · Arecaceae
Fishtail Palm
Caryota mitis
A bold, rewarding indoor palm with leaflets shaped like a fish's tail, fun to grow once you respect its prickly fruit.
Bright indirect
Every 7–14 days
55–84°F · 13–29°C
USDA 9–11
Overview
The fishtail palm earns its name from leaflets that look ragged and torn at the tip, almost exactly like the tail fin of a fish. Those leaflets sit on twice-divided fronds, which gives the whole plant a soft, full, layered look that few other indoor palms can match.
This is a clumping, multi-stemmed grower that keeps pushing fresh shoots up from the base. Instead of a single bare trunk, it fills out into a leafy green column, getting denser as new stems join the crowd. Indoors it settles in between 6 and 10 feet (1.8 to 3 m) tall, making a real statement in a bright corner.
There is one quirk worth knowing up front. A whole stem will eventually yellow and collapse, because each stem flowers once, sets fruit, and then dies. This is normal monocarpic behavior, not a sign of trouble, and the basal suckers keep the clump going strong. The other thing to watch is the small reddish-black berries, which carry needle-like calcium oxalate crystals that burn and itch on bare skin.
Care
The short version: give it bright indirect light, water once the top half of the soil dries out, and keep it warm year-round. Feed monthly through the growing season, then ease off when growth slows. The one rule to never skip: wear gloves when handling the fruit, since the berries irritate skin.
Light
Set it near a window with bright indirect light, filtered rather than blasting full sun. It copes with medium light and a bit of shade, but expect a fuller, faster plant when you give it a genuinely bright spot.
Water
Water well during active growth, then wait until the top half of the soil dries before going again, which usually lands every 7 to 14 days. Ease right off in winter and water sparingly. Aim for evenly moist soil rather than waterlogged, and make sure drainage is good.
Soil
Plant it in a rich, loam-based potting mix that drains freely. It happily handles clay, loam, and sand, so you have plenty of room to work with. Keep the pH between 6.0 to 8.0 and it will reward you.
Temperature
Keep it in the comfortable band of 55°F to 84°F (13°C to 29°C). It has no tolerance for cold drafts or frost, so move it away from chilly windows once winter sets in.
Humidity
Ordinary room humidity gets the job done, though this palm is happier with extra moisture. Dry indoor air is what invites spider mites, so a quick mist or a humidity tray helps a lot through the heating season.
Feeding
Feed it monthly through spring and summer with a balanced palm fertilizer while it is actively putting on growth. Stop in the cooler months, since growth slows right down and the plant has little use for it then.
Pruning
This is light work. Trim away dead or damaged fronds as they appear, and when a stem finishes flowering and dies, cut it out at the base to clear room for the suckers waiting behind it.
Repotting
Move it into a larger pot every 2 to 3 years, or sooner if it gets crowded. Watch for roots circling or pushing out the drainage holes, soil that dries out very fast, and stalled growth with stems packing the pot.
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 let the arching fronds have room to stretch out.
Troubleshooting
Two things account for most of the worry around this palm: a stem dying after it flowers, which is completely normal, and pests showing up when the air dries out, which is fixable. Match what you are actually seeing to the right cause before you treat anything.
Webbing and speckled leaflets in dry indoor air
Warm, dry indoor air practically invites spider mites, and they rank among the worst pests this palm faces inside. Check the undersides of the leaflets for tiny moving dots and fine webbing. Rinse or wipe the foliage, raise the humidity, and treat with insecticidal soap or horticultural oil if they keep coming back.
Fix:
- Rinse or wipe foliage to dislodge mites
- Raise humidity around the plant
- Treat with insecticidal soap or horticultural oil as needed
A whole trunk yellows and dies after blooming
When a full stem goes yellow and collapses after it has flowered and fruited, that is monocarpic flowering, not a disease. Each stem blooms once from the top down, sets reddish-black berries, and then dies right on schedule. Cut the spent trunk 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 handle, so the real hazard sits in the fruit and sap. Sharp calcium oxalate crystals sting the skin, mouth, and throat of people and pets alike, and no part of the plant is safe to eat. Keep the ripe berries away from children and animals, and pull on gloves when cleaning them.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
A cat that bites into the fruit or sap gets a burning mouth fast, then drools, paws at its face, and may show swollen lips or tongue and go off its food.
Dogs Toxic
Dogs that chew the berries tend to drool heavily, act sore around the mouth, and retch, with some vomiting or skipping their next meal.
Horses Caution
Horses rarely cross paths with 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, drooling, and a flat refusal to eat, so never offer any part of this plant.
Livestock Caution
Livestock that mouth the fruit feel a painful sting and swelling and are usually put off after a single taste; fence the plant away from where they browse.
Birds Caution
The irritant crystals make the fruit a poor and risky snack for birds, since pecking a broken berry irritates the beak and mouth, so treat it as off-limits.
People Caution
No part is safe for people to eat, and handling crushed fruit burns and itches the skin for hours; wear gloves when cleaning berries off seeds and keep the fruit 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, because the fishtail palm is grown as the straight species rather than as a lineup of named cultivars.
Caryota mitis (species)
This is the clumping, multi-stemmed fishtail palm whose ragged, twice-divided leaflets look uncannily like a fish's tail, and it keeps renewing itself from basal suckers.
How to propagate
There are two ways to make more of this palm, and one is far quicker than the other: dividing the clump moves fast, while growing 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
Lean on the clumping habit: lift the plant in spring or summer and split the suckers from around the base, which is the easiest way to make new plants. Each division then needs several weeks to a few months to root and resume growing.
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 while cleaning off the pulp because the calcium oxalate burns and itches. This is the slower route, with germination taking several weeks to months and then years to reach size.
Myths
A yellowing, collapsing trunk means the whole palm is dying or diseased.
Not so. Each stem flowers once, fruits, and then dies, while the clump carries right on through fresh basal suckers. This is normal monocarpic behavior, not a problem, so cut out the spent trunk and let the new growth take over.
Like the parlor and areca palms, the fishtail palm is harmless to touch.
The fruit tells a different story. It is packed with needle-like calcium oxalate crystals that sting the skin and cause itching when you handle a broken berry, so wear gloves around ripe fruit. It does not belong in the same safe company as those other palms.