Blue star fern (Phlebodium aureum) care

Ferns · straightforward to keep

Last updated 26 October 2026

Blue star fern (Phlebodium aureum) wants medium to bright indirect light. Water it every 6 days. Keep damp, and keep water off the furry rhizomes that creep over the surface — they rot if buried or kept wet. Pot it in moisture-retentive peat-free compost with perlite. A weak balanced feed monthly in spring and summer, and repot once a year. Humidity: above 60%. A fern in dry air is a fern on its way out. 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 blue star fern: wavy blue-grey fronds growing from furry golden rhizomes that creep along the surface. It tolerates drier air than most ferns, which makes it one of the few realistic ferns for an ordinary room — just never bury the rhizomes.

Quick facts

Water: Water every 6 days. Keep damp, and keep water off the furry rhizomes that creep over the surface — they rot if buried or kept wet.
Light: Medium to bright indirect light.
Humidity: Above 60%. A fern in dry air is a fern on its way out.
Soil: Moisture-retentive peat-free compost with perlite.
Feeding: A weak balanced feed monthly in spring and summer.
Repotting: Repot once a year.
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: Straightforward.
Mature size: 40–70 cm tall.
Native to: Tropical America.

Watering a Blue star fern

Water every 6 days. Keep damp, and keep water off the furry rhizomes that creep over the surface — they rot if buried or kept wet.

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

Medium indirect light, and never direct sun. A bright north window or a well-lit bathroom is close to ideal.

Humidity and temperature

Above 60%. A fern in dry air is a fern on its way out. 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

A mix that holds water without turning to mud: compost with perlite and a little bark. Ferns have fine roots that must never dry out completely.

Feeding

A weak balanced feed monthly in spring and summer. 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 once a year. Every spring. Divide the clump at the same time if it has filled the pot.

Common problems

Fronds going brown and crisp from the tips
Dry air, or the compost dried out.

Fix: Raise the humidity and never let the pot go fully dry. A bathroom is the easy answer.

Brown tips and edges: how to read it on any plant
Leaflets dropping all over the floor
Dry heat, usually from a radiator.

Fix: Move it away from the heat source and raise the humidity.

Leaves falling off: how to read it on any plant
Yellowing fronds in a wet pot
It is sitting in water rather than damp compost.

Fix: Damp, not waterlogged — make sure the pot drains and the saucer empties.

Yellow leaves: how to read it on any plant
Brown dots in rows under the fronds
Spores. Completely normal.

Fix: Nothing to do; it means the fern is mature and happy.

Propagation

Divide the clump in spring. Spores work but take the better part of a year.

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 Blue star fern?

Water every 6 days as a starting point — that is the cadence PlantParlour sets for Phlebodium aureum. Keep damp, and keep water off the furry rhizomes that creep over the surface — they rot if buried or kept wet. 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 Blue star fern need?

Medium indirect light, and never direct sun. A bright north window or a well-lit bathroom is close to ideal.

Is Blue star fern 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 Blue star fern?