Yellow leaves: why your houseplant is turning yellow, and how to save it
A leaf turning yellow is a message. Depending on where it yellows and how, the cause isn't the same: here's how to read the signs, and react without making things worse.
Updated on 9 October 2026
In short
- A bottom leaf yellowing now and then: that's normal, the plant is renewing its foliage.
- Several soft yellow leaves, soil still damp: too much water, by far the most common cause.
- Leaves turning yellow then dry, hard soil: not enough water.
- A pale plant losing its bottom leaves, far from the window: not enough light.
- Young yellow leaves with green veins: often hard water or a lack of fertiliser.
Start by looking at where the leaf turns yellow
Before changing anything, observe: which leaves are yellowing, how many, and how. Feel the soil too. This table gives the most likely cause in each case.
| What you see | Likely cause |
|---|---|
| One bottom leaf now and then, yellowing slowly then drying | Normal ageing |
| Several soft yellow leaves, damp soil, sometimes a musty smell | Too much water |
| Leaves yellow then brown and brittle, dry hard soil | Not enough water |
| Pale plant, stretching stems, bottom leaves dropping | Not enough light |
| Young yellow leaves with veins still green | Hard water, lack of iron |
| Yellow or whitish patches on the window side, turning brown | Sunburn |
| Dull leaves speckled with yellow, fine webs underneath | Spider mites |
Too much water: the number one cause
Roots need air as much as water. In soil that's always wet, they suffocate, rot, and stop feeding the plant. The trap: an overwatered plant wilts and yellows just like a thirsty one. So we water it again… and finish it off.
The signs: soil still damp several days after watering, soft yellow leaves, often the bottom ones, a darkened stem base, sometimes fungus gnats around the pot.
What to do: stop watering until the top inch or so (2–3 cm) of soil is dry (all of it for succulents and cacti). Empty the saucer and the outer pot: water sitting at the bottom of a decorative pot is a classic. And check the pot has a drainage hole.
If the plant keeps declining, or the soil smells bad, take it out of its pot. Healthy roots are firm and pale; rotten roots are brown, mushy, and come away on their own. Cut them off with clean scissors, repot in fresh, barely moist potting mix, and wait a few days before watering again.
Not enough water
Less common than people think, but it happens, especially in summer or in a small pot. The soil shrinks and pulls away from the side of the pot, the pot feels very light, the plant droops, then the leaves yellow and dry out, starting at the edges.
What to do: very dry soil repels water, which runs down the side of the pot without soaking in. Stand the pot in a bowl of water for 20 to 30 minutes, then let it drain well. The dry parts won't turn green again, but the plant will recover. Then get back to a regular rhythm: the watering guide explains how to know when to water.
Not enough light
A plant short of light can't feed all its leaves: it sacrifices the oldest ones, at the bottom. It turns pale, its new leaves are smaller, its stems stretch towards the window. It's common in winter, and in corners far from the glass.
Move it closer to a window, respecting the light it likes, shown on each plant care guide. For a really dark room, choose one of the plants that make do with little light.
Hard water and lack of fertiliser
Young yellow leaves whose veins stay green: that's chlorosis, often caused by limescale. Very hard water ends up stopping the plant from absorbing iron. Some plants are very sensitive to it: the azalea, the gardenia, the calamondin and the hibiscus.
Water them with rainwater or filtered water instead (leaving tap water to stand gets rid of chlorine, but not limescale), and give them a fertiliser containing iron in spring.
A plant that hasn't been fed or repotted for years also ends up yellowing, starting with the old leaves: it has exhausted its soil. A little fertiliser during the growing season, at the rhythm shown on its care guide, is enough. But never feed a plant whose roots are rotting: it would burn them.
Cold and change
A cold draught, a window left open in midwinter, a leaf pressed against icy glass: some tropical plants yellow and drop leaves within days. Others simply react to being moved: the weeping fig is famous for dropping leaves as soon as it changes place. After buying or moving a plant, leave it alone for a few weeks, without moving it again.
Should you cut yellow leaves off?
A leaf that has turned yellow won't turn green again. While it's still partly green, leave it: the plant is recovering what it contains. Once it's fully yellow or dry, cut it at the base with clean scissors, or pull it off if it comes away on its own. Pick up leaves that have fallen on the soil too, as they attract disease.
And remember: most of the time, a plant turns yellow because it's looked after too much, not because it's forgotten.
This advice is for houseplants in a temperate climate. Every home is different: trust your plant too, and the soil under your finger.