Plant diagnosis

Why is my kalanchoe turning yellow?

A flowering succulent that blooms on short winter days — yellowing and mush almost always mean too much water, and no rebloom means too much evening light.

SymptomYellow leaves

PlantKalanchoe

Most likely causeOverwatering or poor drainage

Causes to check4 ranked

The 4 most likely causes

The cause of kalanchoe yellow leavesusually narrows to one of the items below, ranked by how often we see each in Growli's diagnostic chats. Work down the list — most readers find their answer in the top two.

Overwatering or poor drainage (Most likely)
Kalanchoe stores water in its leaves and stems, so the roots stay turgid even after long dry spells. When you water on a fixed weekly schedule the soil never fully dries, the roots suffocate, and the lower leaves go yellow and squishy. Aim for water when the pot is fully dry — every 2-3 weeks.
Wrong light level (Likely)
Kalanchoe is a high-light plant and quickly turns leggy, pale, or stalled in low light. Move it within a metre of a south or east-facing window, or supplement with a grow light. It wants bright light with direct morning sun.
Underwatering or letting it dry too long (Possible)
Underwatering looks similar to overwatering at first — both produce limp, dull leaves — but the soil tells the truth. If the soil is dust-dry several centimetres down, water deeply. Kalanchoe prefers water when the pot is fully dry — every 2-3 weeks.
Nutrient deficiency (nitrogen or iron) (Possible)
If kalanchoe has not been repotted or fed in a year or more, the older leaves can yellow uniformly while the newest growth stays green — a classic sign of nitrogen depletion. Yellow leaves with green veins on new growth point to iron or manganese deficiency. A balanced liquid feed during the growing season usually resolves both.

Why kalanchoe in particular

Kalanchoe leaves are thick, waxy water stores, so healthy ones feel plump and firm. When they turn yellow and go soft or slightly see-through, the near-certain cause on this Madagascan succulent is water sitting around roots adapted to seasonal drought, which cannot cope with constantly damp soil. A few lower leaves yellowing as an old flower cluster fades is normal winding-down after a bloom. Widespread yellowing with mushiness, though, is the succulent's warning that its roots are drowning.

Normal turnover, or real trouble?

Read a yellowing kalanchoe by where it starts. A skirt of the oldest, lowest leaves paling as flowers fade is the plant tidying up after blooming, and those leaves stay reasonably firm. Yellowing that jumps to leaves higher up, or arrives with a soft, waterlogged squash and a whiff from the soil, is the pattern that says the roots are drowning rather than simply retiring a few old leaves.

How to diagnose in 60 seconds

Run these quick checks before you change anything — the right fix depends on what you find.

Kalanchoe wants water water when the pot is fully dry — every 2-3 weeks. Push a finger into the mix and hold it against that: still damp well before it is due, alongside the symptom, is the overwatering signature.
Are the yellowing leaves the oldest ones at the base, or the newest at the tips? Old-leaf yellowing is usually water or nitrogen; new-leaf yellowing is usually iron or root damage.
Look at the back of a yellow leaf with strong light — any speckling, webbing, or sticky residue? That points to pests, not water.
Tip kalanchoe out of its pot and look at the roots: firm and pale is healthy; brown, soft or sour-smelling is rot, which is the real cause behind most of these symptoms.

The fix — step by step

Treat it as a drainage problem, not a feeding one: lift the plant out and feel the roots, and if the mix is wet and any roots are dark, trim them, let the plant sit dry for a day, then repot into gritty, sharp-draining succulent mix. Crucially, stop watering on a schedule; let this drought-adapted succulent's soil dry right through before the next drink, and never leave the pot standing in a saucer.

This is the recovery sequence Growli walks users through for kalanchoe with yellow leaves. Work through the steps in order; skipping ahead is the most common reason a plant fails to bounce back.

Stop watering and check the roots. Don't add more water yet. Unpot kalanchoe and look at the rootball — firm white roots mean you have time; brown mushy roots mean you need to act today.
Trim damaged roots and yellow leaves. Cut off any soft brown roots with clean scissors. Remove fully yellow leaves at the base — they won't green back up. Leave half-yellow leaves alone for now; the plant is still pulling nutrients out of them.
Repot into fresh dry mix. Repot into fresh, well-draining mix in a pot one size up. For kalanchoe, pick a spot with bright light with direct morning sun.
Reset the watering rhythm. Water deeply once, then wait. For kalanchoe, that means water when the pot is fully dry — every 2-3 weeks. Use a finger or a moisture meter — never a calendar.
Resume feeding only after recovery. A stressed plant cannot use fertiliser and the salts will worsen the damage. Wait for at least one round of healthy new growth (4-6 weeks) before resuming a half-strength liquid feed during the growing season.

When this can't be saved

Most cases of kalanchoe yellow leaves are recoverable, but a few red flags point to a plant that has gone past the point of return. If you spot any of these, consider propagating a clean cutting and starting over.

Every leaf has yellowed simultaneously and the stem feels soft at the base — root rot has likely consumed the plant.
New leaves emerge yellow and crispy and never green up — the growing tip is damaged.
The soil smells sour or sulphurous even after a thorough drying period.

Prevention

For kalanchoe, the single biggest preventative is matching its native rhythm: water when the pot is fully dry — every 2-3 weeks, bright light with direct morning sun, and a free-draining pot with a working drainage hole. Group kalanchoe with plants of similar needs so you can water them as a batch rather than guessing per-pot. Set a calendar reminder to feed during the growing season but never feed a sick or freshly-repotted plant — wait for healthy new growth first.

Common questions

Why is my kalanchoe yellow leaves?

Kalanchoe yellow leaves is most often caused by overwatering or poor drainage. Stop watering, check the roots for rot, and reset the rhythm to water when the pot is fully dry — every 2-3 weeks.

What is the most common cause of kalanchoe yellow leaves?

The most likely cause is overwatering or poor drainage. Kalanchoe stores water in its leaves and stems, so the roots stay turgid even after long dry spells. When you water on a fixed weekly schedule the soil never fully dries, the roots suffocate, and the lower leaves go yellow and squishy. Aim for water when the pot is fully dry — every 2-3 weeks.