Houseplant · Crassulaceae
Flaming Katy
Kalanchoe blossfeldiana
Set it in bright light, gritty soil, and dry spells between waterings, and this succulent brings weeks of color to a room.
Bright indirect
59–77°F · 15–25°C
USDA 10–12
6–12 in · 15–30 cm
Overview
Flaming katy is a small Madagascan succulent prized for the long-lasting color it brings to a room, with tight clusters of flowers that earn their keep on a shelf or sill. It shares a family with jade and sedum and, like them, stores water in thick, glossy leaves. That gives it the relaxed temperament of a plant that suits a busy household, forgiving of a missed watering and content to look composed on its own.
At just 6 to 12 inches (15 to 30 cm) tall, it slips into the small corners other plants cannot fill, from a kitchen sill to a desk or a bedside table. Its flowers arrive in red, orange, pink, yellow, and white, an easy way to pick up an accent color already in the room, and a single flush holds for weeks. Because florists bring it into bloom in every season, it is the gift plant that always seems to be in style.
It is an undemanding companion to a daily routine, and it returns to flower once you learn its rhythm. Give it a bright window and a stretch of long nights to set buds, and let the soil dry out completely between waterings. Honor those two habits and it keeps a corner in color, year after year.
Care
The short version: a bright indirect spot, gritty fast-draining soil, and a thorough soak only once the soil has dried out completely. Feed lightly through the growing season, then give it long fall nights to bring the color back.
Light
A spot with bright indirect light, such as the area beside a sunny window that escapes the harsh midday glare, shows it off at its best. It will take some direct sun and even partial sun, but a dim corner leaves it stretched and reluctant to flower, and the styled look slips away.
Water
Let the soil dry completely between waterings, then soak it through and tip out whatever gathers in the saucer. As a succulent it suffers in soggy soil, so when the routine is in doubt, simply wait. To bring the color back it also wants about six weeks of long nights, roughly 14 hours of uninterrupted darkness.
Soil
Give it a gritty, well-drained mix that water moves straight through, such as a cactus blend. A slightly acidic pH of 6.0 to 6.5 suits it, and the sharp drainage is what keeps the roots sound beneath a handsome top.
Temperature
Ordinary room warmth keeps it comfortable, ideally 59°F to 77°F (15°C to 25°C). Keep it clear of cold drafts and frost, since this is a tender plant that resents a chill, drafty corner.
Humidity
Average household air is plenty, and it is happiest on the low side of humidity. There is no figure to chase, and an ordinary living room suits it better than a steamy bathroom.
Feeding
Feed it monthly through spring and summer while it grows, with a balanced water-soluble fertilizer diluted to half strength. Let it rest from feeding in fall and winter as growth slows.
Pruning
Deadhead the spent blooms to keep the display crisp, then pinch the stems back after flowering. That keeps it bushy and compact rather than thinning to a few long, bare stalks that read untidy on a shelf.
Repotting
Move it up a pot size every 1 to 2 years, or sooner if it crowds, always choosing a container with drainage that also fits the room. Roots at the holes, water rushing straight through, or stalled growth all signal the time has come.
Size & spacing
Plan for a compact plant of 6 to 12 inches (15 to 30 cm) tall with a spread of 8 to 16 inches (20 to 40 cm), an easy footprint for a tabletop or sill. Leave a little room for air to move around the leaves, which keeps powdery mildew away and the grouping looking fresh.
Troubleshooting
Nearly every flaming katy mishap comes down to water or light, the two habits that shape how it looks in a room. Too much water and the roots rot quietly out of sight, too little light and it loses its tidy shape and its flowers. Match what you see below and address the cause behind the look.
A softening, darkening base that spoils the display
A base that has gone soft and dark is root and crown rot, the usual result of too much water in soil that never quite dries. Lift the plant from its container and the story is plain: brown, soft, foul-smelling roots in place of firm pale ones. Trim every spoiled piece with clean tools, settle it into fresh gritty mix, and keep it dry until it finds its feet again. A pot that drains and a full dry spell between waterings keep the centerpiece looking its best.
Fix:
- Remove the plant from wet soil
- Cut away all rotted tissue with clean tools
- Repot into fresh gritty, well-drained mix
- Withhold water until the plant recovers
A loose, reaching shape with little to show
A plant that leans toward the glass with airy gaps between its leaves has lost the trim silhouette a styled corner wants, and one that refuses a second bloom is simply missing its long nights. Both are easy to put right. Set it in a bright spot with indirect light, offer about six weeks of roughly 14 hours of complete darkness each night to coax the buds along, and pinch the loose stems back into shape. Bright light through the year with a quiet short-day stretch in fall keeps it presentable and in flower.
Fix:
- Move to a bright spot with indirect light
- Provide about six weeks of roughly 14 hours of complete darkness each night to trigger budding
- Pinch back leggy stems
A pale, powdery cast over the foliage
A dusty pale film that wipes away from the leaves is powdery mildew, the kind of thing that settles in when plants sit close together in still, humid air. Lift away the worst leaves, give the grouping more breathing space so air can drift through, and keep water off the foliage at watering time. Watering down at the soil and keeping the air on the dry side returns the display to its clean, polished look.
Fix:
- Remove badly affected leaves
- Improve air circulation and spacing
- Avoid wetting the foliage when watering
Toxicity
However at home it looks on a shelf, this is a plant to keep thoughtfully placed around animals. Every part carries bufadienolides, cardiac glycosides that upset the gut and, in larger amounts, disturb the heartbeat. Position it out of reach of pets and livestock, and call a vet right away if an animal eats any of it.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Toxic
Should a cat sample any part, drooling, vomiting, and diarrhea tend to follow soon after. A larger mouthful can unsettle the heart rhythm, which makes it a matter for the vet without delay.
Dogs Toxic
In dogs the usual picture is drooling, vomiting, diarrhea, and a noticeable dip in energy. A large helping lets the same bufadienolides slow or skip the heartbeat.
Horses Toxic
Since the cardiac glycosides run all through the plant, a horse that grazes on it risks colic, diarrhea, and a heart arrhythmia of real concern.
Rabbits Toxic
For a rabbit there is no safe portion at all. A mere few leaves can bring on digestive upset and the heart-rhythm trouble these glycosides are known for.
Livestock Toxic
Cattle, goats, and sheep that reach it may show drooling, scouring, weakness, and an uneven heartbeat traced to the bufadienolides.
Birds Toxic
Place it well beyond the reach of birds. The same cardiac toxin reaches them as well, and their small size means even a little is enough to harm.
People Caution
No part of this plant belongs on a plate, and swallowing it can leave the stomach unsettled. Keep it where small children cannot reach to taste the bright flowers.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
Most flaming katy on offer today has been bred for fuller flowers and a tidy, compact shape, the kind that styles well in a small pot. These two groups cover what tends to reach the garden center.
Calandiva series
This compact series brings fully double, rose-like flowers in a sweep of colors that suit almost any palette.
Flapjacks-flowered florist hybrids
These single-flowered florist forms gather dense clusters of red, orange, pink, or yellow for a bold spot of color.
How to propagate
Flaming katy lends itself to multiplying a look, since one plant can furnish several. You can root a stem tip or raise new plants from a single leaf, both best done in spring or summer while it is growing.
Stem cuttingsEasy
Spring to summer during active growth · 2 to 3 weeks to root
Filling a windowsill grouping starts with a stem tip, best taken in spring or summer while the plant is growing. Snip a healthy tip, leave the cut end to callus for a day or two so it will not rot, then set it into gritty, barely moist mix. Roots arrive in about 2 to 3 weeks, ready to repeat the look elsewhere.
Leaf cuttingsModerate
Spring to summer · 3 to 6 weeks to form plantlets
A single leaf can become the start of another accent for the room, taken in spring or summer. Let the leaf callus, rest it on well-drained mix, and keep it lightly moist while small plantlets gather at the base over 3 to 6 weeks.
Myths
It is a harmless gift plant that is safe to keep around pets.
For all its charm on a side table, this florist plant is genuinely toxic to cats and dogs. The bufadienolides it carries are cardiac glycosides that bring on vomiting and diarrhea, and in quantity they can unsettle the heartbeat. Style it on a high shelf or in a pet-free room and enjoy it without worry.