Plant diagnosis
Why is my geranium dropping leaves?
Window-box pelargoniums are sun-and-air plants — yellow lower leaves mean wet soil, leggy growth means a dim corner, and blackened stem bases mean rot has won.
The 5 most likely causes
The cause of geranium dropping leaves usually 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.
- Shock from a sudden change (move, repot, new home) (Most likely)
Geranium reacts to a sudden change — a move to a new room, a big shift in light, repotting, or the trip home from the shop — by shedding leaves to match its new conditions. The drop looks alarming but is usually temporary: keep the spot and routine stable, and new growth resumes within a few weeks. - Overwatering or poor drainage (Likely)
In most homes overwatering is more often a drainage problem than a frequency problem. Geranium needs a pot with a drainage hole, a chunky free-draining mix, and a watering rhythm of water deeply, then let the top third of the pot dry. Soggy soil drowns the roots and the first symptom you see above ground is yellowing or wilting foliage. - Underwatering or letting it dry too long (Likely)
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. Geranium prefers water deeply, then let the top third of the pot dry. - Pests sucking sap (Possible)
Sap-sucking pests (aphids, spider mites, mealybugs, scale) all cause similar symptoms: yellow stippling, distorted new growth, sticky residue. Inspect leaf undersides and stem joints with strong light. Most are controlled with weekly insecticidal soap or a horticultural oil spray. - Normal ageing of the lowest leaves (Possible)
Every plant retires its oldest leaves as it grows — one or two yellowing, dropping lower leaves on an otherwise pushing geranium is bookkeeping, not a problem. It only becomes a symptom when the drop outpaces new growth or spreads to young leaves.
Why geranium in particular
Pelargoniums shed their oldest leaves readily, and a few lower leaves yellowing and dropping - especially just after you move a plant indoors for winter, or into a darker room - is ordinary sulking as it adjusts. Overwatering brings on the same lower-leaf yellow-and-drop, since this dry-country plant hates soggy roots. Sudden loss of many leaves, or leaves falling while still green, points to a stem rot such as blackleg cutting off the water supply from below.
Normal turnover, or real trouble?
A geranium brought in for winter, or shifted darker, sheds a scatter of lower leaves for a week or two and then stops once it has adjusted - a self-limiting sulk that re-leafs from the tips in better light. One deliberately rested cool and dry over winter will drop most of its leaves on purpose. Steady, reversible loss like this reassures; leaves falling faster and faster, or dropping while green and firm, does not.
How to diagnose in 60 seconds
Run these quick checks before you change anything — the right fix depends on what you find.
- Are the fallen leaves green or yellow? Green leaves dropping = sudden shock (light, cold, a move); yellow first = a watering or nutrient issue.
- Which leaves are falling — only the oldest at the base, or leaves everywhere? Base-only is often normal ageing; all-over is stress.
- What changed in the last 2-3 weeks? A move, a repot, a heating season starting, a new draught — leaf drop almost always follows a change.
- Geranium wants water water deeply, then let the top third of the pot dry. 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.
The fix — step by step
If the drop began when you moved it, the cure is patience in the right spot: give it the brightest sill, let the soil dry further between waterings, and hold off feeding until it settles - a sulking geranium rots easily if kept wet. But if leaves fall green and firm, ignore the surroundings and check the stem base: soft and blackening means blackleg, and only a healthy top cutting will save it.
This is the recovery sequence Growli walks users through for geranium with dropping leaves. Work through the steps in order; skipping ahead is the most common reason a plant fails to bounce back.
- Stop moving it. Pick the best realistic spot for geranium — bright, draught-free, away from radiators — and commit to it. Every relocation restarts the acclimation clock, and each restart costs leaves.
- Check the soil and the roots. Finger test first: soggy soil means unpot and inspect for rot (firm white roots stay, brown mush gets trimmed); dust-dry soil means a deep soak in the sink. Correct whichever extreme you find.
- Buffer temperature swings. Move the plant away from cold windowpanes, entry doors, AC vents, and radiators. Geranium drops leaves at sudden temperature changes more than at any single steady temperature.
- Hold off on fertiliser. A shedding plant is stressed and cannot use extra nutrients — feeding now adds salt stress on top. Wait until you see new growth hold for 3-4 weeks before resuming half-strength feeds.
- Give it 2-4 quiet weeks. Once conditions are stable, most shock-driven leaf drop stops within a few weeks and new buds appear at the nodes. Judge recovery by new growth, not by the leaves already lost — those never reattach.
When this can't be saved
Most cases of geranium dropping 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.
- More than half the canopy has dropped within a week — shock this severe often outruns the plant's reserves.
- Bare stems snap dry and brittle instead of bending — that wood is dead, not dormant. Scratch-test for green under the bark.
- The stem base is soft or discoloured where it enters the soil — the leaf drop is being driven by rot, and the rot rescue steps apply instead.
Prevention
For geranium, the single biggest preventative is matching its native rhythm: water deeply, then let the top third of the pot dry, 6+ hours of direct sun for compact growth and flowers, and a free-draining pot with a working drainage hole. Pick the plant's spot once and defend it: no seasonal shuffling, no draughty doorways, no radiator neighbours. When winter heating starts, nudge humidity up before the plant complains. Any big change it can't avoid (a repot, a move) is better done in spring, when recovery is fastest.
Common questions
Why is my geranium dropping leaves?
Geranium dropping leaves is most often caused by shock from a sudden change (move, repot, new home). Keep its spot and routine stable, correct the soil-moisture extreme you find, and let it re-acclimate — the shed usually stops within 2-3 weeks.
What is the most common cause of geranium dropping leaves?
The most likely cause is shock from a sudden change (move, repot, new home). Geranium reacts to a sudden change — a move to a new room, a big shift in light, repotting, or the trip home from the shop — by shedding leaves to match its new conditions. The drop looks alarming but is usually temporary: keep the spot and routine stable, and new growth resumes within a few weeks.
Why does this happen to geranium in particular?
Pelargoniums shed their oldest leaves readily, and a few lower leaves yellowing and dropping - especially just after you move a plant indoors for winter, or into a darker room - is ordinary sulking as it adjusts. Overwatering brings on the same lower-leaf yellow-and-drop, since this dry-country plant hates soggy roots. Sudden loss of many leaves, or leaves falling while still green, points to a stem rot such as blackleg cutting off the water supply from below.
How do I fix a geranium with dropping leaves?
If the drop began when you moved it, the cure is patience in the right spot: give it the brightest sill, let the soil dry further between waterings, and hold off feeding until it settles - a sulking geranium rots easily if kept wet. But if leaves fall green and firm, ignore the surroundings and check the stem base: soft and blackening means blackleg, and only a healthy top cutting will save it.
Is geranium dropping leaves normal, or a real problem?
A geranium brought in for winter, or shifted darker, sheds a scatter of lower leaves for a week or two and then stops once it has adjusted - a self-limiting sulk that re-leafs from the tips in better light. One deliberately rested cool and dry over winter will drop most of its leaves on purpose. Steady, reversible loss like this reassures; leaves falling faster and faster, or dropping while green and firm, does not.
How do I prevent geranium dropping leaves?
For geranium, the single biggest preventative is matching its native rhythm: water deeply, then let the top third of the pot dry, 6+ hours of direct sun for compact growth and flowers, and a free-draining pot with a working drainage hole. Pick the plant's spot once and defend it: no seasonal shuffling, no draughty doorways, no radiator neighbours. When winter heating starts, nudge humidity up before the plant complains. Any big change it can't avoid (a repot, a move) is better done in spring, when recovery is fastest.