Leaf drop — leaves falling off rather than merely discolouring — is a plant shedding foliage it can no longer support or no longer needs. The most useful first question is how fast it is happening: a sudden shower of leaves points to shock or a sharp change in conditions, while a slow, steady drop from the bottom points to light, watering or age. Sorting sudden from gradual narrows the cause immediately.
The short answer
Most leaf drop traces to a change the plant is reacting to — being moved or repotted, the shift indoors for winter, a cold or hot draft — or to a watering extreme in either direction. Stabilise the conditions, correct the watering, and the drop usually stops within a week or two; new growth confirms recovery.
Sudden drop vs gradual drop
- Sudden drop (many leaves at once) → shock: a recent move, repotting, a cold draft, a heating vent, or a swing from very dry to very wet.
- Gradual drop from the bottom up → too little light, chronic over- or under-watering, or simple aging of the oldest leaves.
- Drop with yellowing first → usually watering or root related (see yellow leaves).
- Drop of green, healthy-looking leaves → almost always sudden environmental shock.
Environmental change and shock
Plants dislike abrupt change. A plant that drops leaves days after coming home from the shop, being repotted, or being moved to a new room is reacting to the change in light, humidity and temperature, not necessarily to anything you did wrong — weeping figs (Ficus benjamina) are notorious for shedding heavily after any move. Give it a stable spot with appropriate light and leave it there; resist the urge to repot or relocate a shocked plant again, which only restarts the process. This is closely related to transplant shock.
Watering causes
Both extremes cause drop. Overwatering rots roots so the plant sheds leaves it can no longer supply — typically lower leaves yellow, then fall, with the soil staying wet (see root rot and overwatering vs underwatering). Underwatering makes a plant abandon leaves to cut its water loss — leaves crisp and drop and the soil is bone dry. Correct the rhythm with how to water houseplants.
Light and temperature causes
Moving a plant to a darker spot triggers it to drop the now-unsupportable lower and inner leaves until it balances its canopy to the new light — common every autumn as indoor light falls; see light requirements. Cold drafts from doors and windows, and hot dry air from radiators and heating vents, both cause leaf drop; keep plants clear of those spots and protect tender ones from cold and from excess heat.
Natural and seasonal drop
Some leaf drop is entirely normal. Deciduous plants shed in autumn; many evergreens quietly drop their oldest leaves year-round; and plants routinely shed a few lower leaves as they grow taller. A handful of old leaves lost over time is nothing to worry about — it is the sudden or wholesale loss of leaves, especially younger ones, that signals a problem.
Nutrient, root and pest causes
Starvation and severe root problems cause the oldest leaves to yellow and drop first (see fertilizing). A root-bound plant sheds as it outgrows its pot — time to repot. Heavy infestations of spider mites or mealybugs, and some leaf diseases, also cause premature drop; check undersides and stems.
What to do now, and what not to do
Identify sudden vs gradual, then check the soil and the light. For shock: hold the plant steady in a good spot and wait. For watering: correct the extreme — and if the soil is wet, do not water more. Do not repot or fertilise a plant that is dropping leaves from shock; both add stress. Remove only leaves that have fully dropped or died.
Recovery, prevention and exceptions
A plant that stops dropping and pushes new growth has stabilised. Prevent leaf drop by minimising abrupt moves, easing plants gradually between very different environments (especially the autumn move indoors), watering to need, and keeping plants away from drafts and heat sources. Exceptions to keep in mind: Ficus (weeping fig, rubber plant) and gardenias drop dramatically at the slightest change and then recover; citrus drops leaves from cold and from letting the pot dry out; and truly deciduous plants are supposed to drop everything and will releaf in spring. Related: wilting.
What to inspect first
Work through four quick checks in order and the cause usually reveals itself. 1) The timeline: did the drop follow a move, a repot, or the seasonal switch indoors? If so, treat it as shock and hold conditions steady. 2) The soil: push a finger in — wet points to root rot, bone-dry to drought, both of which drive leaf loss (see overwatering vs underwatering). 3) Which leaves: lowest and oldest first suggests light or age; sudden loss of green upper leaves suggests shock or a draft. 4) The undersides: webbing, sticky residue or tiny insects point to pests rather than culture.
The autumn move indoors
The single most common seasonal trigger is bringing plants indoors for winter. The abrupt fall in light, humidity and day length prompts many plants — citrus, ficus, hibiscus, tropical foliage — to shed a flush of leaves as they rebalance to dimmer conditions. Ease the transition by moving plants in before the heating comes on, giving them your brightest window, and cutting back on water to match their slower winter growth. Expect some drop regardless; it slows as the plant acclimatises.
How long it lasts
Shock-related drop typically runs for one to three weeks and then stops once the plant settles; the appearance of firm new leaves is the all-clear. Drop driven by an ongoing fault — a plant left too dark, or roots sitting in wet soil — continues until you correct the cause, so persistent leaf loss is a prompt to re-check light, watering and roots rather than to wait it out.
Related plant problems
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