Calathea Undulata 'Wavestar' (Calathea Wavestar) care

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness calathea undulata 'wavestar' grows fastest in. Bright indirect to medium light keeps the contrast and silver feathering crisp. An east window or filtered light is ideal. Direct sun bleaches and crisps the small leaves; very low light dulls the markings and slows the compact growth. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for when the top 2 cm of soil dries, roughly every 5-7 days in growth for calathea undulata 'wavestar', but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep the mix lightly and evenly moist. Use rainwater, distilled, or filtered water; this cultivar is notably sensitive to fluoride and salts, which brown the delicate margins. Water sparingly in winter without letting the rootball fully dry.

Soil and pot

Calathea Undulata 'Wavestar' grows best in light, airy, moisture-retentive peat-free mix. Mix coir or peat-free compost with perlite and a little fine bark for aeration and even moisture. Slightly acidic (pH 6.0-6.5). Keep it open and free-draining in a pot with drainage holes to avoid soggy, rot-prone roots. 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

Calathea Undulata 'Wavestar' sits happiest at around 60-80% humidity and 18-27°C (64-80°F). A high-humidity lover that excels in terrariums and enclosed cabinets. Below 50% the wavy edges quickly brown and curl. Use a humidifier or pebble tray and keep away from radiators and cold drafts. 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 calathea undulata 'wavestar' sparingly. Feed every 4 weeks in spring and summer with a balanced houseplant fertiliser at half strength. As a small, light feeder it is prone to salt-related tip burn; flush the soil occasionally and stop feeding in winter when growth slows. 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 calathea undulata 'wavestar' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crispy, browning leaf edges — Low humidity or hard, fluoridated water. Switch to rainwater or distilled and keep humidity high, ideally in an enclosed space.
• Curling leaves — Underwatering or dry air. Keep the rootball evenly moist and raise humidity until leaves relax.
• Loss of leaf contrast — Too much direct sun fades the silver feathering. Move to brighter indirect light, out of direct rays.
• Spider mites — Dry air invites mites on the small leaves. Increase humidity, rinse foliage, and treat promptly with insecticidal soap.

Propagation

Propagate by dividing the rhizome clump in spring at repotting. Gently separate rooted sections with several leaves and pot into fresh moist mix, keeping them warm and humid until established. Its compact habit makes division straightforward; seed and cuttings are impractical. 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

Calathea Undulata 'Wavestar' is pet-safe. ASPCA-listed as non-toxic to cats and dogs. As a Calathea/Goeppertia (undulata) cultivar in the Marantaceae prayer-plant family, it contains no insoluble calcium oxalates or other toxic principles. Pet-safe, though eating large amounts of any houseplant can cause mild, transient stomach upset. 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.

Calathea Undulata 'Wavestar' deep-dive guides

Every aspect of calathea undulata 'wavestar' care, each with its own calibrated guide:

• Calathea Undulata 'Wavestar' watering schedule
• Calathea Undulata 'Wavestar' light requirements
• Best soil mix for calathea undulata 'wavestar'
• Calathea Undulata 'Wavestar' fertilizing guide
• When to repot calathea undulata 'wavestar'
• How to propagate calathea undulata 'wavestar'
• Calathea Undulata 'Wavestar' growth rate & size
• Calathea Undulata 'Wavestar' cold hardiness
• Calathea Undulata 'Wavestar' temperature & humidity
• Is calathea undulata 'wavestar' toxic to cats & dogs?
• Is calathea undulata 'wavestar' toxic to cats?
• Is calathea undulata 'wavestar' toxic to dogs?

Featured in these plant shortlists

Calathea Undulata 'Wavestar' qualifies for 12 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best pet-safe low-light plants — Non-toxic to cats and dogs AND happy with no direct sun — the two hardest constraints to satisfy at once.
• Best humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Best bathroom plants — Humidity-loving houseplants that also cope with lower light — suited to the steamy, often-dim conditions of a typical bathroom.
• Best pet-safe bathroom plants — Non-toxic to cats and dogs and happy in the humid, lower-light conditions of a bathroom — safe greenery for the smallest room.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Best pet-safe bedroom plants — Non-toxic to cats and dogs and happy in lower light — calming greenery for a bedroom where a pet often sleeps too.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Best small pet-safe plants — Compact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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