Why Are My Plant's Leaves Turning Yellow? 10 Causes & How to Fix Each

Yellow leaves are the most common cry-for-help a houseplant can send you — and the most confusing, because almost every possible problem can cause them. The trick is to look at which leaves are turning yellow, where on the plant they sit, and how the colour is spreading. Those three clues usually point straight to the cause. This guide walks you through the ten most common reasons, in roughly the order you should suspect them, with a clear fix for each.

A 30-second diagnosis checklist

Before changing anything, take half a minute to gather evidence. The pattern of the yellowing is far more useful than the colour itself:

• Which leaves? Older bottom leaves, newer top leaves, or random leaves across the plant?
• How fast? Overnight, or over the past week or two?
• Texture? Soft and mushy, dry and crispy, or still firm?
• Soil? Wet for days, bone dry and pulling from the pot, or somewhere in between?
• Recent change? A move to a new spot, repot, change of season, or new fertilizer?

Hold those answers in mind as you read — the cause will usually jump out.

1. Overwatering and root rot

What you see: Multiple leaves yellowing at once, often starting at the base. Leaves feel soft and limp, not crispy. Soil stays wet for days. In bad cases the soil smells sour and roots are brown and mushy when you slide the plant out.

This is by far the most common cause of yellow leaves. Soggy soil suffocates the roots, they begin to rot, and the plant loses its ability to take up water — so paradoxically, an overwatered plant looks thirsty too. People then water more, and the cycle accelerates.

The fix: stop watering immediately. Move the plant somewhere bright and airy and let the top several centimetres of soil dry out. If the rot is advanced, slide the plant out, trim away any black or mushy roots with clean scissors, and repot into fresh, well-draining mix in a pot that's only a touch larger than the root ball. Then learn to water by checking the soil, not the calendar — that single change prevents this from happening again.

2. Underwatering

What you see: Lower leaves turn yellow then crispy brown at the tips and edges. The plant looks limp and the leaves feel dry and papery. Soil is hard, sometimes pulling away from the sides of the pot, and water runs straight through without soaking in.

Chronic under-watering starves the plant of moisture; the plant sacrifices its oldest leaves first, yellowing them before letting them drop.

The fix: give the plant a bottom soak. Set the pot in a basin of water for 20 to 30 minutes so the soil can re-absorb moisture from below. Then drain thoroughly and resume normal watering when the top 2–5 cm of soil feels dry. Don't try to "make up" for the missed waterings with extra; that just pushes you into the overwatering column.

3. Too little (or too much) light

What you see for low light: a generally pale, washed-out plant with thin new growth that stretches toward the window. Older leaves slowly yellow and drop because the plant can't photosynthesize enough to support them all.

What you see for too much light: bleached, pale-yellow patches on the leaves that face the window — almost a sunburn — with brown crispy spots in the worst-hit areas.

The fix: match the plant to the spot. If the plant looks leggy and pale, move it closer to a window or supplement with a small grow light. If the leaves look scorched, pull it back from harsh midday sun or filter the light through a sheer curtain. Our guide on how much light houseplants need walks through reading the light in any room.

4. Nutrient deficiency

What you see: the pattern here is the telltale. Older lower leaves yellowing uniformly usually points to a nitrogen shortage — nitrogen is mobile, so the plant pulls it out of old leaves to feed new ones. Newer top leaves yellowing with green veins still showing (a pattern called interveinal chlorosis) points to an iron or magnesium shortage.

This is especially common in plants that haven't been fed for a long time or are in old, exhausted soil.

The fix: resume a sensible feeding routine. A balanced liquid fertilizer diluted to half strength every 2 to 4 weeks during spring and summer is enough for most foliage houseplants. See our fertilizing guide for amounts, timing, and what N-P-K actually means.

5. Rootbound and overdue for a repot

What you see: roots circling the bottom of the pot or poking out of drainage holes. Water flows straight through without absorbing. Lower leaves yellow steadily even though you're doing everything else right.

A plant that has filled its pot has almost no soil left to hold water or nutrients. It dries out fast, drinks itself empty, and starts shedding leaves to balance the books.

The fix: repot into a container one or two sizes larger with fresh mix. Spring is the best time; the plant will rebound quickly as it puts out new roots.

6. Cold drafts or sudden temperature swings

What you see: sudden yellowing or browning on the side of the plant nearest a cold window, exterior door, air-conditioning vent or radiator. Often appears within a day or two of the temperature change.

Most popular houseplants are tropical. Anything below about 13 °C (55 °F), or a steady draft of cold or hot dry air, will stress them quickly.

The fix: move the plant at least half a metre away from cold panes of glass in winter and away from forced-air vents year-round. Aim for steady indoor temperatures between 18 and 24 °C (65–75 °F).

7. Pests sucking the sap

What you see: tiny yellow speckles or stippling on the leaves, especially on the undersides. Fine webbing (spider mites), white cottony tufts in the leaf joints (mealybugs), small brown bumps stuck to stems (scale), or clouds of small black flies (fungus gnats).

Sap-sucking pests drain chlorophyll directly from the leaves, producing pale, mottled yellowing that's distinct from a watering or light issue.

The fix: isolate the plant from your other plants immediately. Rinse off as many pests as possible in the shower, then treat weekly with insecticidal soap or a neem-oil solution until the infestation is gone. Our deeper guide to common houseplant pests covers identification and safe treatments for each.

8. Hard water, chlorine or fluoride

What you see: tan or yellow tips and edges on the leaves, sometimes with a thin brown rim, especially on sensitive species like spider plants, calatheas, prayer plants and dracaenas.

Heavily chlorinated or fluoridated tap water builds up in the soil over time and burns leaf tips. Softened water adds sodium, which is worse.

The fix: let tap water sit out overnight before using it (chlorine dissipates), or switch to filtered or rainwater. Flush the soil thoroughly every few months by watering until plenty runs out the bottom — this leaches accumulated salts. Never use salt-softened water.

9. Transplant or acclimation shock

What you see: the plant has been recently repotted, moved to a new home, or shifted between very different rooms. A few leaves yellow and drop within the first week or two.

Plants don't move well. Any sudden change in light, humidity or root environment triggers a temporary stress response. They drop the leaves the new conditions can't support, then settle in.

The fix: don't add more stress. Don't fertilize a freshly repotted plant for at least 4 to 6 weeks. Keep watering normal, keep the location stable, and the plant will produce new healthy leaves once it adapts.

10. Old leaves dying off (totally normal)

What you see: an occasional yellow leaf at the base of an otherwise thriving plant. The rest of the plant looks happy. New growth is steady.

Leaves don't live forever. As a plant ages and produces new foliage, it retires its oldest, lowest leaves and recycles their nutrients. Snake plants, peace lilies, dracaenas and rubber plants all do this routinely.

The fix: nothing. Snip the dead leaf off at the base, enjoy the new growth, and don't change anything. If only one leaf per month is yellowing and the rest of the plant looks great, you're doing fine.

Should you cut off yellow leaves?

Yes. Once a leaf has turned fully yellow, the chlorophyll is gone and it won't turn green again — the plant is just keeping it on while it pulls out the last of the useful nutrients. Snipping it at the base with clean, sharp scissors does three good things: it redirects the plant's energy into new growth, it makes it easier to spot any new yellowing (the actual early-warning signal), and it makes the plant look tidier instantly.

One exception: if a leaf is only half yellow, leave it. The green part is still photosynthesising. Wait until it goes mostly yellow before trimming.

Frequently asked questions

Next: if you suspect watering is the root cause, work through our complete guide to watering houseplants the right way. If you suspect pests, jump to common houseplant pests and how to beat them.