Fishbone cactus (Epiphyllum anguliger) care

Succulents & cacti · easy to keep

Last updated 26 October 2026

Fishbone cactus (Epiphyllum anguliger) wants bright indirect light. Water it every 9 days. Water when the top half of the pot is dry — more often than a desert cactus, less than a houseplant. Keep it drier for six weeks in autumn to set buds. Pot it in an open mix — cactus compost with bark and perlite through it. A balanced feed at half strength monthly from spring to late summer, then stop, and repot every 2 years. Humidity: above 50%. Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested.

The fishbone cactus: long, flat, zigzag stems cut into deep lobes like a fishbone, trailing from a hanging pot. A forest cactus, not a desert one — it wants bright indirect light and more water than a cactus, and may flower at night with large, fragrant white blooms.

Quick facts

Water: Water every 9 days. Water when the top half of the pot is dry — more often than a desert cactus, less than a houseplant. Keep it drier for six weeks in autumn to set buds.
Light: Bright indirect light.
Humidity: Above 50%.
Soil: An open mix — cactus compost with bark and perlite through it.
Feeding: A balanced feed at half strength monthly from spring to late summer, then stop.
Repotting: Repot every 2 years.
Toxic to pets: Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews.
Difficulty: Easy.
Mature size: Trailing stems to 1 m.
Native to: Mexico.

Watering a Fishbone cactus

Water every 9 days. Water when the top half of the pot is dry — more often than a desert cactus, less than a houseplant. Keep it drier for six weeks in autumn to set buds.

That cadence is the one PlantParlour sets for this species when you name it, and it is deliberately on the cautious side — a plant that asks a day early is safer than one that asks a day late. Log each watering and the reminder moves with the plant rather than with the calendar.

Light

Bright indirect light. Like the holiday cacti, this is a forest epiphyte and scorches in direct sun.

Humidity and temperature

Above 50%. Central heating in winter is what turns a comfortable room into a dry one, and it is the usual reason an established plant suddenly browns at the edges or picks up spider mites.

Soil and potting

More like an orchid mix than a desert cactus one: open, bark-heavy, free-draining, but not pure grit.

Feeding

A balanced feed at half strength monthly from spring to late summer, then stop. Stop feeding in autumn and start again when you see new growth in spring — feeding a plant that isn't growing just builds up salts in the pot.

Repotting

Repot every 2 years. Every three or four years, after flowering. They bloom better potbound.

Common problems

Buds dropping before they open
It was moved, or the temperature or watering changed.

Fix: Once the buds form, leave it alone — do not turn it, move it, or change the routine.
No flowers
It needs cool nights and long darkness in autumn to set buds.

Fix: From early autumn, give it twelve to fourteen hours of darkness and nights around 12–15 °C for six weeks.
Limp wrinkled segments
Either too dry or rotting roots.

Fix: Check the roots before watering.
Red or purple segments
Too much direct sun, or hungry.

Fix: Move it out of direct sun and feed in spring.

Propagation

Twist off a piece two or three segments long, let it dry for a day, then push it into damp compost.

A cutting taken in PlantParlour keeps its link to the plant it came from, so a propagation years later still traces back to the mother plant — which is the point if you ever sell or trade it.

Toxicity and safety

Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews.

If your pet has eaten a plant, call your vet, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661. Both are open around the clock and may charge a consultation fee. Take the plant or its label with you.

This is general information, not veterinary advice. We don't test plants: what we say about toxicity follows the ASPCA's published plant list as it stood on 26 October 2026, and that list can change. "Non-toxic" means not poisonous — a pet that eats enough of any plant can still vomit, and fertiliser, pesticide or leaf shine on a plant can harm it. It also only helps if the plant is what you think it is. It covers cats and dogs only; ask your vet about rabbits, birds, reptiles or anything else, and a doctor about children. Read our terms.

Every houseplant in the library the ASPCA lists as non-toxic to cats and dogs

Questions people ask

How often should you water a Fishbone cactus?

Water every 9 days as a starting point — that is the cadence PlantParlour sets for Epiphyllum anguliger. Water when the top half of the pot is dry — more often than a desert cactus, less than a houseplant. Keep it drier for six weeks in autumn to set buds. Light, pot size and the time of year all move that number, so treat it as a reminder to go and check rather than a rule.

How much light does a Fishbone cactus need?

Bright indirect light. Like the holiday cacti, this is a forest epiphyte and scorches in direct sun.

Is Fishbone cactus toxic to cats and dogs?

Not on the ASPCA's list of toxic or non-toxic plants, so we don't call it pet-safe: not being listed is not the same as being tested. Keep it out of reach of a pet that chews. If a pet has eaten part of a plant, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 straight away.

How do you propagate a Fishbone cactus?