Kalanchoe Blossfeldiana Care: Light, Water, Temperature & Reblooming Tips

Quick answer: Kalanchoe blossfeldiana (Flaming Katy) is a colorful, low-maintenance succulent. Give it bright, indirect light, water only when the soil is fully dry (about every 2 weeks), plant it in fast-draining cactus mix, and keep it between 60–75°F. To make it flower again, it needs a stretch of long, dark nights. Note: it is toxic to cats and dogs.

Meet the Flaming Katy

Native to Madagascar and first described by botanist Robert Blossfeld in 1926, Kalanchoe blossfeldiana is a compact succulent in the Crassulaceae family. It grows 6–18 inches tall and wide, with glossy, scallop-edged leaves and dense clusters of small star-shaped flowers in red, pink, orange, yellow, and white. Modern varieties such as Calandiva add double blooms with far more petals than the classic four. If you received one as a gift, our guide on keeping a gift kalanchoe thriving is a good companion read.

Care at a glance

Light

Flaming Katy flowers best in bright, indirect light — 6–8 hours a day near a south- or west-facing window. Keep it out of harsh direct sun, which scorches the leaves.

• Too little light → leggy, stretched stems and few flowers.
• Too much direct sun → brown, crispy, or reddened leaves.
• Rotate the pot regularly for even growth; add a grow light in dark rooms.

Watering

As a succulent, kalanchoe stores water in its leaves and hates soggy soil. Water thoroughly, then let the mix dry out completely before watering again.

• Indoors: roughly every 2 weeks in spring/summer, every 3–4 weeks in winter.
• Check first — push a finger 1–2 inches into the soil; water only if dry.
• When in doubt, underwater. (Our indoor watering guide covers seasonal timing.)

Overwatering shows as yellow, mushy leaves and soft stems; underwatering as shriveled, wrinkled foliage.

Soil and potting

Use a gritty, fast-draining mix — a simple 50% potting soil / 50% cactus mix, with extra perlite for drainage. Always use a pot with drainage holes; terracotta is ideal because it wicks away excess moisture and helps prevent root rot.

Temperature and humidity

Kalanchoe is happiest at 60–75°F during the day with slightly cooler nights (50–60°F), which actually encourages blooming. Protect it from temperatures below 50°F and keep it away from drafts and heating vents. It needs no extra humidity — average household levels are fine.

Feeding

Feed lightly during spring and summer with a balanced, water-soluble fertilizer at half strength, every 4–6 weeks. If you get lots of leaves but few flowers, switch to a higher-phosphorus feed. Stop fertilizing in winter while the plant rests.

Pruning and deadheading

Deadheading keeps the show going: when blooms fade, snip the spent flower stem back to the leaves so the plant puts energy into new buds instead of seeds. Pinch stem tips to encourage a fuller, bushier shape, and always use clean tools. For a full walkthrough, see our guide to pruning a kalanchoe for bushiness.

Getting your kalanchoe to rebloom

Kalanchoe is photoperiodic — it sets flower buds in response to long nights, not day length. To trigger a fresh flush:

• Give it 14–16 hours of complete darkness each night for about 6 weeks (a closet or a box over the plant works).
• Provide bright, indirect light during the day.
• Water sparingly and stop feeding during this period.
• When buds appear, return it to normal care.

Our dedicated guide, getting kalanchoe to rebloom: the light-cycle secret, goes deeper if it is being stubborn.

Pests and problems

Kalanchoe is generally tough, but watch for aphids (soft insects on new growth) and mealybugs (white cottony clusters in leaf joints). Knock them off with a water spray, then treat with neem oil, insecticidal soap, or a dab of rubbing alcohol — our houseplant pest guide has the full routine. The bigger risk is root rot from overwatering; if you see yellowing, mushy stems, wilting in wet soil, or a bad smell, improve drainage and let the soil dry.

Propagation

Kalanchoe is easy to multiply from stem cuttings or offsets:

• Take a healthy 2–4 inch cutting, remove the lower leaves, and let it callus for 1–2 days.
• Plant in fast-draining succulent mix and keep in bright, indirect light; roots form in about 3–4 weeks.
• Offsets (small pups at the base) can be separated and potted the same way.

Step-by-step help is in our how to propagate kalanchoe guide. (Curious about the wild-looking relatives? See Mother of Thousands.)

A note on pets

Kalanchoe blossfeldiana contains cardiac glycosides and is toxic to cats and dogs. Keep it out of reach, and call your vet if you suspect your pet has chewed it.

Frequently asked questions

Are kalanchoe plants toxic to pets?

Yes — they contain cardiac glycosides and are toxic to cats and dogs. Keep out of reach and contact a vet if ingested.

How often should I water my kalanchoe?

About every 2 weeks in the growing season, every 3–4 weeks in winter, always letting the soil dry fully first.

What light do kalanchoes need?

Bright, indirect light for 6–8 hours a day. Avoid harsh direct sun.

How do I get my kalanchoe to rebloom?

Give it 14–16 hours of darkness nightly for about 6 weeks, with reduced water and no fertilizer, until buds form.

How long do kalanchoe plants live?

With good care they can live for many years, reaching mature size in 2–5 years and blooming repeatedly.