Growli

Plant care

Waras' Earth Star (Waras Earth Star) care

Cryptanthus warasii

Also called Waras Earth Star, Giant Earth Star.

RHS H1cUSDA 12Pet-safeIndoor 30-45 cm wide

Watering rhythm

7-10days

When the top 2 cm of potting mix is dry, roughly every 7-10 days

Light

Bright indirect light (just back from a sunny window)

Soil

Moisture-retentive peat-free mix with added perlite

Humidity

60-80%

Temp

18-28°C

Pet safety

Pet-safe

Mature size

30-45 cm wide

Care at a glance

Light

Waras' Earth Star is what florists mean by "bright spot, no direct sun" — close enough to a south or east window to feel the brightness, with a sheer curtain or a few feet of distance keeping the sun off the leaves. Requires brighter indirect light than smaller Cryptanthus species to maintain the silver banding and vigorous growth. Low light results in greener, less ornamental foliage. A phone lux-meter at the leaf surface should read 1,500-3,000 lux at noon.

Watering

Water waras' earth star when the top 2 cm of potting mix is dry, roughly every 7-10 days. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. As a terrestrial bromeliad it relies on root uptake rather than a central cup. Water carefully around the base of the rosette. Never allow the pot to sit in standing water.

Soil and pot

Waras' Earth Star grows best in moisture-retentive peat-free mix with added perlite. A blend of coco coir, perlite and a little worm castings suits this larger species well. It needs enough moisture retention to avoid desiccation but must drain freely to prevent rot. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Waras' Earth Star sits happiest at around 60-80% humidity and 18-28°C (64-82°F). High humidity is important for leaf quality. This is an ideal candidate for a large vivarium or greenhouse bench. In average household air, mist regularly and group with other plants. If you keep the room above 18 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed waras' earth star sparingly. Feed monthly during spring and summer with a quarter-strength balanced liquid fertiliser diluted into the watering can. Flush the pot with plain water every few months to prevent salt build-up. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on waras' earth star in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Browning outer leavesOuter leaves naturally age and brown. Remove them at the base and inspect for scale or rot as a precaution.
  • Flat, uninspired colouringInsufficient light reduces the silver banding. Move to a brighter position away from direct sun.
  • Root rotHeavy or compacted compost combined with overwatering is the primary cause. Repot into a fresh, open mix with extra perlite.
  • Scale insectsHard scale can colonise the undersides of leaves. Treat with horticultural oil or a systemic insecticide suitable for houseplants.
  • Desiccation in heated roomsCentral heating drops humidity far below the preferred range. Use a humidifier or keep the plant in a naturally humid room.

Companion plants

Waras' Earth Star pairs well with Cryptanthus beuckeri, Neoregelia fosteriana, Tillandsia aeranthos, and Alocasia amazonica. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

After flowering, stoloniferous pups form around the base. Allow them to develop a small root system before separating and potting individually in warm, humid conditions. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Waras' Earth Star is pet-safe. Not individually listed by the ASPCA, but Cryptanthus belongs to the Bromeliaceae family, which the ASPCA broadly considers non-toxic to cats and dogs. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Waras' Earth Star care — frequently asked questions

What is the common name for Cryptanthus warasii?

Cryptanthus warasii is most commonly called Waras' Earth Star, but it is also known as Waras Earth Star, Giant Earth Star. The names refer to the same species, so care instructions for Waras' Earth Star apply identically to anything sold as Waras Earth Star.

How much light does waras' earth star need?

Waras' Earth Star grows best in bright indirect light (just back from a sunny window). Requires brighter indirect light than smaller Cryptanthus species to maintain the silver banding and vigorous growth. Low light results in greener, less ornamental foliage.

How often should I water waras' earth star?

Water waras' earth star when the top 2 cm of potting mix is dry, roughly every 7-10 days. As a terrestrial bromeliad it relies on root uptake rather than a central cup. Water carefully around the base of the rosette. Never allow the pot to sit in standing water. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is waras' earth star toxic to cats and dogs?

Waras' Earth Star is pet-safe. Not individually listed by the ASPCA, but Cryptanthus belongs to the Bromeliaceae family, which the ASPCA broadly considers non-toxic to cats and dogs.

What USDA hardiness zone does waras' earth star grow in?

Waras' Earth Star is rated for USDA zone 12 (indoor-only) and RHS hardiness H1c. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Waras' Earth Star deep-dive guides

Every aspect of waras' earth star care, each with its own calibrated guide:

Featured in these plant shortlists

Waras' Earth Star qualifies for 6 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Waras' Earth Star is also commonly called Waras Earth Star or Giant Earth Star.