Earth star (Cryptanthus bivittatus) care

Bromeliads & air plants · easy to keep

Last updated 26 October 2026

Earth star (Cryptanthus bivittatus) wants bright indirect light; strong light deepens the colours. Water it weekly. Water the compost when the top few centimetres are dry. It has no central cup to fill. Pot it in a light, free-draining compost. A very weak feed occasionally, into the central cup rather than the compost, and repot every 2 years. Humidity: above 60%. The ASPCA lists it as non-toxic to cats and dogs.

The earth star: small, flat, star-shaped rosettes of wavy, striped leaves in pink, green and cream. Unlike most bromeliads it grows on the ground, so it roots into its compost and has no cup to fill — a good terrarium plant.

Quick facts

Water: Water weekly. Water the compost when the top few centimetres are dry. It has no central cup to fill.
Light: Bright indirect light; strong light deepens the colours.
Humidity: Above 60%.
Soil: A light, free-draining compost.
Feeding: A very weak feed occasionally, into the central cup rather than the compost.
Repotting: Repot every 2 years.
Toxic to pets: Non-toxic to cats and dogs. The ASPCA lists Earth Star (Cryptanthus bivattus minor) as non-toxic to cats and dogs (checked 26 October 2026).
Difficulty: Easy.
Mature size: 10–15 cm across.
Native to: Brazil.

Watering an Earth star

Water weekly. Water the compost when the top few centimetres are dry. It has no central cup to fill.

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. Bromeliads take more shade than most flowering plants but need brightness to keep their colour.

Humidity and temperature

Above 60%. 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 light compost with bark and perlite. Unlike most bromeliads it grows on the ground rather than on trees, and roots into the mix.

Feeding

A very weak feed occasionally, into the central cup rather than the compost. 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. Rarely. The parent rosette flowers once and then slowly dies over a year or two, leaving pups around its base — those are what you pot on.

Common problems

Brown, crisp leaf edges
Dry air.

Fix: Raise the humidity; it does well in a terrarium.

Brown tips and edges: how to read it on any plant
Rot at the base
The compost was kept too wet.

Fix: Let the top dry between waterings and make sure the pot drains.
The parent rosette fading after flowering
Normal: bromeliads flower once, then finish.

Fix: Pot up the pups that form around it once they are a third of its size.

Propagation

Separate the pups when they are a third to a half the size of the parent, with a sharp knife at the base.

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

Non-toxic to cats and dogs.

The ASPCA lists Earth Star (Cryptanthus bivattus minor) as non-toxic to cats and dogs (checked 26 October 2026).

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 an Earth star?

Water weekly as a starting point — that is the cadence PlantParlour sets for Cryptanthus bivittatus. Water the compost when the top few centimetres are dry. It has no central cup to fill. 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 an Earth star need?

Bright indirect light. Bromeliads take more shade than most flowering plants but need brightness to keep their colour.

Is Earth star toxic to cats and dogs?

Non-toxic to cats and dogs. The ASPCA lists Earth Star (Cryptanthus bivattus minor) as non-toxic to cats and dogs (checked 26 October 2026). 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 an Earth star?