Pseuderanthemum carruthersii var. carruthersii (Yellow-splashed pseuderanthemum) care

Light

Bright but filtered. Pseuderanthemum carruthersii var. carruthersii burns within days in unfiltered south-facing summer sun, and stops growing within months in deep shade. Bright, indirect light keeps the yellow variegation bold; low light causes the gold to revert toward plain green. Protect from intense direct midday sun, which bleaches and scorches the leaves, though gentle morning sun is tolerated. If you only have a south window, set the plant back 1.5 m or hang a sheer curtain — both knock the intensity down into the right range.

Watering

Watering pseuderanthemum carruthersii var. carruthersii: when the top 2-3 cm of soil is dry, roughly every 5-7 days in summer. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Maintain evenly moist soil during growth without letting the roots sit in water. Ease off in the cooler months. Consistent moisture prevents leaf drop; wilting and dull foliage usually mean the plant has dried out too far.

Soil and pot

Pseuderanthemum carruthersii var. carruthersii grows best in fertile, well-draining, humus-rich potting mix. A peat-free houseplant mix with added compost and perlite or bark gives moisture retention and aeration. Slightly acidic to neutral pH (6.0-7.0) is ideal. Always use a container with drainage holes. 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

Pseuderanthemum carruthersii var. carruthersii sits happiest at around 60-80% humidity and 18-29°C (64-84°F). High humidity is important for clean, undamaged foliage; below 50% the margins brown. Use a humidifier, pebble tray, or a humid room. It performs well in conservatories and warm bathrooms. 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 pseuderanthemum carruthersii var. carruthersii sparingly. Apply a balanced liquid fertiliser at half strength every 2-4 weeks in spring and summer to support both growth and strong variegation. Withhold feed in autumn and winter. 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 pseuderanthemum carruthersii var. carruthersii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Loss of variegation — Too little light makes the yellow splashes fade to green. Increase bright indirect light and remove any fully green reverted shoots to preserve the pattern.
• Browning leaf margins — A symptom of low humidity or dry, heated air. Boost ambient humidity and keep the plant away from radiators and cold drafts.
• Leaf drop in cold — Temperatures below ~15°C or chilly drafts trigger leaf loss. Keep it warm and stable year-round.
• Mealybugs and scale — Sap-suckers hide in leaf joints and along stems. Inspect regularly, wipe off with alcohol-dipped cotton, and treat persistent infestations with insecticidal soap or neem oil.

Propagation

Propagate by softwood or semi-ripe stem-tip cuttings in spring or summer. Take 8-10 cm tips, remove lower leaves, dip in rooting hormone, and root under cover in a warm (21-25°C), humid environment. Expect roots within about 3-4 weeks. 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

Pseuderanthemum carruthersii var. carruthersii is mildly toxic to pets. Pseuderanthemum carruthersii is not individually listed on the ASPCA Toxic and Non-Toxic Plants database, and the genus is not ASPCA-classified, so toxicity to cats and dogs is unconfirmed. Treat as potentially harmful, keep away from pets, and confirm with a vet rather than relying on unverified 'pet-safe' assertions. 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.

Pseuderanthemum carruthersii var. carruthersii deep-dive guides

Every aspect of pseuderanthemum carruthersii var. carruthersii care, each with its own calibrated guide:

• Pseuderanthemum carruthersii var. carruthersii watering schedule
• Pseuderanthemum carruthersii var. carruthersii light requirements
• Best soil mix for pseuderanthemum carruthersii var. carruthersii
• Pseuderanthemum carruthersii var. carruthersii fertilizing guide
• When to repot pseuderanthemum carruthersii var. carruthersii
• How to propagate pseuderanthemum carruthersii var. carruthersii
• Pseuderanthemum carruthersii var. carruthersii growth rate & size
• Pseuderanthemum carruthersii var. carruthersii cold hardiness
• Pseuderanthemum carruthersii var. carruthersii temperature & humidity
• Is pseuderanthemum carruthersii var. carruthersii toxic to cats & dogs?
• Is pseuderanthemum carruthersii var. carruthersii toxic to cats?
• Is pseuderanthemum carruthersii var. carruthersii toxic to dogs?

Featured in these plant shortlists

Pseuderanthemum carruthersii var. carruthersii qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• 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 humidity-loving houseplants — Houseplants that thrive in a bathroom, kitchen, or by a humidifier — selected by documented humidity preference.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

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