Kalanchoe care - light, water and getting it to flower again

A kalanchoe, said ka-lan-KOH-ee, is a flowering succulent that wants bright light, very little water and long dark nights before it will bloom again. Most are bought in flower and thrown out when the flowers stop. This page covers which one you own, how to water it without rotting it, and how to get the flowers back.

Bright light, with a little direct morning sun. In shade it stretches and stops flowering.
Water only when the soil is dry all the way through, and never onto the leaves.
To flower again it needs long, genuinely dark nights for several weeks running.

Which kalanchoe you have: florist, panda and mother of thousands

Most plants sold under the bare genus name are Kalanchoe blossfeldiana, the florist kind that arrives already in flower. NC State Extension puts the genus at 174 accepted species out of Africa and Asia, and three groups cover nearly everything on sale. You tell them apart by looking rather than by the label, which is often just the genus.

Flower clusters standing above glossy, scalloped, fleshy leaves is the florist one. Thick pale leaves under a grey-white fuzz, with chocolate-brown spots along a wavy edge, is the panda plant. Rows of small plantlets growing along the leaf margin is the mother of thousands group, and those plantlets root and drop on their own, which is why one plant becomes a dozen without being asked.

All of them are succulents, so all of them want the gritty mix and the dry spells every plant on the indoor succulents page wants. The one for a bright indoor sill is the florist kind, because it stays small and it flowers. The panda plant suits the same spot and will not flower for you indoors, so buy it for the leaves. Keep the mother of thousands out of any pot standing near others. Beyond those, beharensis, luciae, marnieriana and thyrsiflora turn up on specialist nursery labels.

Species	How you know it	Light	Suits a pocket?
Kalanchoe blossfeldiana, florist kalanchoe	Umbels of tiny red, orange, yellow, pink or white flowers over oval scalloped leaves, 15 to 45 cm tall	Bright, 6 to 8 hours a day	Yes, and it is the one this page is written for
Kalanchoe tomentosa, panda plant	Pale fleshy oblong leaves under grey-white fuzz, chocolate-brown spots along a wavy edge	Bright indirect, at least 6 hours	Yes while young, but it reaches 30 to 90 cm
Kalanchoe daigremontiana, mother of thousands	Triangular leaves to 20 cm with plantlets right along both margins	Bright indirect, no hot midday sun	No, the plantlets drop into everything below
Kalanchoe delagoensis, mother of millions	Narrow spotted leaves with plantlets at the tip teeth	Full sun to partial shade	No, and it is a declared problem in several warm countries

How much light a kalanchoe needs

A kalanchoe wants the brightest windowsill in the house, with an hour or two of direct morning sun if you can give it. NC State Extension asks for six to eight hours of bright light a day for the florist species, and Clemson notes that the plant goes spindly in low light.

It stores water in its leaves, so it takes early sun that would scorch a fern, and it pays for shade in a specific order you can watch happen. First the stems stretch and the gaps between leaves open up. Then the base goes bare. Then it stops setting flower buds altogether, and no amount of feeding brings them back. Move it before the second stage rather than after the third.

If the brightest window in the room still needs a lamp on at midday, this is the wrong plant for that room, and forcing it there only produces a long bare stem. Put something that wants shade in the dark corner and keep the sill for this. The low light houseplants piece covers what actually lives in the dim half of a flat.

Watering a kalanchoe without rotting it

You water a kalanchoe when the soil is dry the whole way through, not on a schedule. Every source that gives a number gives a different one, and none of them knows your room, so the interval is the wrong thing to copy. What you copy is the test.

Two checks, both free. Push a finger two knuckles into the soil, and damp anywhere down there means wait. Then lift the pot: a dry one is noticeably lighter, and after a few weeks you read the weight faster than the finger. Light is what sets the pace, because a plant on a bright sill dries far faster than the same plant three metres back into the room. A ZZ plant carries its own water the same way and fails the same way when it is watered on a rota.

Overwatering shows before it is fatal, and it shows at the bottom. The lowest leaves go soft and slightly translucent, and the stem gives when you press it. Water into the soil rather than over the plant, because water sitting in the crown between the leaves rots it from the middle, and that one is not recoverable.

Soil and pot for a kalanchoe

It wants a mix that dries out and a pot that lets it, which is the whole of the requirement. NC State Extension asks for a well-drained potting mix made for cactus or succulents, and the rest of this section is that one line worked out.

The mix. A cactus or succulent compost, or an ordinary peat-free mix cut with a third of perlite or coarse grit. A standard houseplant compost on its own holds water round the roots for days after the surface looks dry.
The drainage hole. Not negotiable. A decorative pot with no hole is a reservoir, and if you use one as a cover, lift the inner pot out to water and let it drain before it goes back.
The pot itself. Unglazed terracotta breathes and dries faster than plastic, which suits a plant that wants to dry. Go barely bigger than the root ball, because spare wet compost round the edge is where rot starts.
Feeding. Clemson puts it at an ordinary houseplant feed once a month while it is actively growing, and nothing at all while it is resting. Too much gives you soft floppy growth and fewer flowers, which is the opposite of what you fed it for.

How to get a kalanchoe to flower again

A kalanchoe sets flower buds when the nights get long, so you give it long nights on purpose. NC State Extension asks for total darkness 14 hours a day for at least six weeks, and Clemson describes the same treatment as a 14 to 16 hour night held for about six weeks.

Darkness is what it counts, not daylight, and that is the part every failed attempt gets wrong. A lamp switched on in the same room at ten at night resets the count, and so does a hallway light through an open door. The plant needs the dark to be genuinely unbroken, which usually means a cupboard, a box over the top, or a spare room nobody walks into after dinner.

Cut the spent flower stems back to the first pair of healthy leaves.
Move it somewhere cooler, and keep watering it sparingly.
Give it 14 hours of unbroken darkness every night, in a cupboard or under a box.
Hold that for about six weeks, letting it have bright light the rest of each day.
When buds show, bring it back to the bright sill and water normally.

Is a kalanchoe an indoor or an outdoor plant?

Both, but not all year in most places. It is a tender succulent, so the rule is frost rather than season: Clemson has it going outdoors once the danger of frost has passed and coming back in before the first frost of the autumn. Where winters stay above freezing it can live outside permanently, and it will be a better plant for it, because outdoors is where it gets the light it actually wants.

Give it the warm end of ordinary room temperature. Clemson puts the ideal at roughly 7 to 18 °C at night and 10 to 21 °C by day, which is a cool windowsill rather than a heated living room. Cold damage looks like translucent, water-soaked patches that go brown and papery in a day or two, and it shows on the leaves nearest the glass first. A snake plant tolerates a cold hallway far better if that is the only spot going spare.

How long a kalanchoe lives, and whether it comes back

It is a perennial and it comes back every year, which is not what the way it is sold suggests. The plant you bought in flower is years old already, and the flowering is a season in its life rather than the whole of it. Nothing about it is annual except the shop’s assumption.

What happens instead is quieter and it is why so many end up in the bin. Without long dark nights it never sets buds again, so it keeps growing, stays green, gets taller and leggier every year and simply never flowers. That is a light problem being read as death. If yours has gone bare at the base and has not bloomed in two seasons, the answer is not to nurse it: take cuttings and start again with the young growth, which roots readily and flowers sooner.

A kalanchoe on the wall

A kalanchoe suits a wall pocket if the wall is bright, and it is the wrong plant for anyone who waters generously. The pocket holds 1.8 litres of substrate, about what a 15 cm pot takes, and whether the liner drains has not been tested. A succulent is the plant least willing to sit in water, so the honest instruction is to water in measured amounts rather than to soak it, and to let it dry out completely in between. A peperomia is more forgiving in the same spot if that sounds like hard work.

Pick the wall before the plant. It needs to be the brightest vertical surface you have, near a window rather than opposite one, because a pocket on a dim wall grows the same long bare stem a pot on a dim shelf does. Hang it at eye level or just below, where you can see into the flowers and reach in to check the substrate with a finger.

The Small board is 24 × 24 cm and hangs from one hinge on one wall hook, so the wall side is one screw, one plug and one drilled hole. Treat the filled weight like a heavy framed picture rather than a poster: plasterboard takes an expanding plug, brick a standard one, and a tiled wall needs a tile bit before the masonry bit. The mounting guide has the rest of the sequence.

Take the plant out of its pot and knock the loose compost off the root ball.
Half fill the pocket with a cactus or succulent mix.
Sit the plant in, fill around it and press lightly.
Water in small measured amounts until the substrate is just damp, never soaked.

Kalanchoe problems and how to fix them

Almost everything that goes wrong here is water or light, and the leaves tell you which. Soft and translucent is too much water. Wrinkled and thin is too little. Long and bare is too little light. The table sorts the six you are most likely to meet.

One distinction saves most plants. Lower leaves going soft at the base is the beginning of rot and it is fixable the same day by unpotting and cutting back to firm tissue. A stem that gives all the way down is past that, and the useful move then is to take cuttings from whatever is still firm at the top.

What you see	Why	The fix
Lower leaves soft and slightly see-through	Overwatering, and the beginning of stem rot	Stop watering, unpot it and cut back to firm tissue, then repot in dry gritty mix.
Leaves wrinkled, thin and limp	It has been dry too long	Water it properly once, let it drain, and check by weight from now on.
Long bare stems with leaves only at the tips	Too little light	Move it to the brightest sill you have and cut the bare stems back hard.
Dry brown patches on the leaves facing the glass	Midday sun magnified through the window	Move it back from the glass or filter the light at midday. Burnt patches do not heal.
No flowers after the first season	The nights were never long enough or never fully dark	Give it 14 hours of unbroken darkness a night for about six weeks.
White cottony spots in the leaf joints	Mealybug, which Clemson lists as one of its common pests	Wipe each one off with a cotton bud and check the joints every time you water.

How to propagate a kalanchoe from a leaf or a cutting

Cuttings root readily and a young plant flowers sooner than an old leggy one, so this is the answer to most tired kalanchoes rather than a hobby. Clemson takes stem cuttings 5 to 8 cm long with two pairs of leaves, in spring or summer, from growth that is not flowering.

A clean sharp knife or snips
Small pots and the same free-draining mix the parent is in
A shoot that is not in flower, from the current year’s growth
Somewhere bright and out of direct sun for the first few weeks

Choose a healthy shoot that is not flowering and cut 5 to 8 cm, just below a leaf joint.
Strip the leaves off the bottom half so nothing sits buried in the mix.
Leave the cutting on a dry surface for a day or two until the cut end seals over.
Push it into barely damp free-draining mix, deep enough to stand up on its own.
Keep it bright and out of direct sun, and water only when the mix has gone dry.
Tug it gently after a few weeks. Resistance means it has rooted and can be potted on.

Do not skip the drying day. A wet cut on a succulent rots instead of rooting, and that is the step almost everyone leaves out. A rooted cutting is also small enough for a pocket or a moss ball, which is what a kokedama is.

So the decision at the end of a tired plant is easy. One that has gone bare at the base is not worth nursing back, and cutting it down without taking cuttings first throws away the only part still worth having. Take three, then cut it back, and you keep the plant either way. The plant care guide has the rest of them by light and water.

How do you pronounce kalanchoe?

NC State Extension gives it as ka-lan-KOH-ee, with four syllables and the stress on the third. More than one pronunciation is in common use, which is why nurseries and gardeners disagree about it, and none of them will misunderstand you.

How long does a kalanchoe stay in flower?

Several weeks, and often a couple of months, because the individual flowers are small and long-lasting and open in succession across the cluster. A bright spot that is not hot keeps them longest. Heat and a dim corner both cut it short.

Do kalanchoes come back every year?

Yes. It is a perennial, so the plant carries on for years, but the flowers only return if it gets 14 hours of unbroken darkness a night for about six weeks. Without that treatment it keeps growing and never blooms again, which is what most people mistake for the plant dying.

Should you cut the dead flowers off a kalanchoe?

Yes. Cut the whole spent stem back to the first pair of healthy leaves rather than picking off individual dead flowers. It stops the plant putting energy into seed, and it takes the tired stems off the new growth coming from below.

Is kalanchoe toxic to cats and dogs?

Yes. The ASPCA lists the genus as toxic to both, with vomiting, diarrhoea and, rarely, an abnormal heart rhythm, and NC State Extension records every part of the plant as poisonous to people too. Keep it well out of reach of an animal that chews plants, and call a vet straight away if any has been eaten rather than waiting to see.

Can a kalanchoe live in a bathroom?

Only one with a good window, and even then it is not the best spot in the house. This is a plant that wants dry air and hard light, so the humidity works against it. In a windowless bathroom it stretches, stops flowering and eventually rots.