Kalanchoe (flaming Katy) care

Light

Kalanchoe is a sun-lover and needs the brightest spot in the home to thrive. 4-6 hours of bright light, with some direct sun. Insufficient light prevents flowering. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Water kalanchoe when the soil is dry, every 10-14 days. The actual day count varies with pot size, light level, and the season — the finger test (or, better, lifting the pot to feel its weight) is more reliable than a calendar. Empty any drainage saucer after watering so the pot is never sitting in water. Water deeply and let the soil dry between drinks. Cut back further during dormancy.

Soil and pot

Kalanchoe grows best in free-draining cactus or succulent mix. Coarse cactus mix or 1:1 potting compost and perlite. 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

Kalanchoe sits happiest at around 30-50% humidity and 15-24°C (60-75°F). Dry household air is ideal. If you keep the room above 15 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 kalanchoe sparingly. Half-strength cactus or bloom feed monthly during the growing season; switch to a higher-phosphorus feed when buds form. 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 kalanchoe in the Growli community. Each is annotated with the most common cause so you know where to start.

• No re-bloom after the first flowering — Kalanchoes need a 6-week period of long nights (14+ hours of darkness) to set new buds.
• Yellow leaves — Overwatering.
• Drooping leaves — Underwatering after a long dry spell.
• Leggy growth — Insufficient light; move to a sunnier spot.

Companion plants

Kalanchoe pairs well with Jade plant, Aloe vera, and Echeveria. 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

Leaf or stem cuttings allowed to callus root readily in dry succulent mix. 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

Kalanchoe is toxic to pets. ASPCA lists Kalanchoe as toxic to cats, dogs and horses due to cardiac glycosides (bufadienolides). Symptoms include vomiting, diarrhoea, and rarely heart arrhythmia. Veterinary attention if ingested. 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.

Kalanchoe deep-dive guides

Every aspect of kalanchoe care, each with its own calibrated guide:

• Kalanchoe watering schedule
• Kalanchoe light requirements
• Best soil mix for kalanchoe
• Kalanchoe fertilizing guide
• When to repot kalanchoe
• How to propagate kalanchoe
• Kalanchoe growth rate & size
• Kalanchoe cold hardiness
• Kalanchoe temperature & humidity
• Is kalanchoe toxic to cats & dogs?
• Getting kalanchoe to bloom

Related guides

Kalanchoe is also known as flaming Katy, Christmas kalanchoe, and Madagascar widow’s thrill.

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• All 200 plant care guides in the Growli library