Yellow Leaves on Plants, Six Causes and the Fix for Each (2026)

Last updated: 30 September 2026

> Quick Answer: Yellow leaves on plants come from six causes: overwatering, nitrogen shortage, iron lock-up, magnesium shortage, wrong light, and pests or root damage. On the RHS reading, old lower leaves point to nitrogen or magnesium and new leaves to iron. Only two of the six are fixed by feeding.

The colour tells you very little. Where it shows up tells you nearly everything. A leaf goes yellow when it loses chlorophyll, and six quite different problems do that. What separates them is which leaves go first, whether the veins stay green, and how the mix feels under your finger.

It matters because the fixes pull in opposite directions. Fertiliser rescues a hungry plant and finishes off a drowning one, and wood ash that helps a potash-short rose makes an iron-short lemon worse. Most yellow pots on an Indian terrace aren't hungry at all.

Old leaves, new leaves, edges or between the veins?

Start with the position. General yellowing of the oldest, lowest leaves points to nitrogen; yellow between green veins on the newest leaves points to iron; the same pattern on older leaves points to magnesium; yellow or browning edges on mature leaves point to potassium. Yellow at any height on limp leaves points to water.

The RHS guide to chlorosis sets these patterns out: iron deficiency affects the youngest leaves first, magnesium and manganese start in the older ones, and nitrogen causes a more general yellowing, usually of the older leaves. The logic is mobility. University of Florida IFAS Extension lists nitrogen, potassium and magnesium as mobile, so the plant strips them from old leaves to feed new ones, while iron cannot move and shows up in new growth.

Is it overwatering, the commonest cause in pots?

Very often, yes. If the leaves are soft and limp, yellowing at any height, and the mix is still damp 2 inches down two days after watering, the roots are short of air. University of Maryland Extension calls overwatering the number one reason indoor plants fail, and names leaf yellowing as its result.

Roots need oxygen to take up anything. That's why a waterlogged plant can look starved while it sits in nutrients. The RHS adds that yellowing also follows waterlogged or compacted soil. Push a finger into the mix before you reach for any bag: if it is wet, the answer is less water and a clear drainage hole, and no fertiliser will help.

How do nitrogen, iron and magnesium shortfalls differ?

Nitrogen yellows the whole of an old leaf, veins included, from the bottom of the plant up, with slow, thin growth. Iron yellows new leaves between dark green veins. Magnesium gives the same green-veined pattern on older leaves, sometimes with reddish-brown tints before they drop.

Iron is the one that feeding can't fix. On the alkaline soils common across Delhi, Haryana and Punjab, iron is present but locked up, which is why citrus, gardenia and hibiscus in local garden soil so often show it. The RHS nutrient guide corrects a magnesium shortage with Epsom salt, 20 g per litre of water sprayed on or watered over the leaves, two or three times a fortnight.

Could it be too little light, or sun scorch?

Both yellow leaves, from opposite ends. Too little light gives pale, stretched growth that yellows and drops from the inside of the plant, common indoors and on north-facing balconies in winter. Sun scorch gives bleached or yellow-white patches on the most exposed leaves, often after a plant is moved into sudden full sun.

Neither has anything to do with fertiliser. Move the pot, and bring shade-grown plants into strong sun gradually, over a week or two. A plant that has spent the monsoon under cover will scorch in its first bright October week on an open terrace.

When is it pests or root damage?

When the yellow is patchy or speckled, when there is fine webbing or sticky residue under leaves, or when a plant yellows and wilts even though the mix is neither dry nor soggy. Sap-sucking pests such as mites, aphids and mealybugs yellow leaves from outside; grubs and root rot do it from below.

Turn a few leaves over first. If the leaves are clean, slide the plant out of its pot: sound roots are firm and pale, rotted ones brown and soft, and grubs show in the mix. The RHS lists root diseases among the causes of yellowing, and a plant with a damaged root system will not respond to feeding until new roots grow.

What should you feed once you know the cause?

Feed only the two causes that are genuinely shortages you can supply organically: nitrogen and potassium. Mustard cake answers nitrogen, a small pinch of wood ash answers potassium on a mix below pH 7, and neem seed powder belongs in the mix when grubs are the problem. Overwatering, iron lock-up and light have no fertiliser answer.

The hub on which fertiliser each plant actually needs covers rates by plant; per cause, per 10 to 12 inch pot:

• Nitrogen shortage: 100 g of mustard oil cake powder, sarso khali, worked into the topsoil; 25 to 30 g for a 6 to 8 inch pot. At ₹229 for 900 g, a 100 g feed costs about ₹25 per pot.
• Potassium shortage: under 10 g of wood ash once a year, only after a pH check below 7, because ash raises pH.
• Grubs or root pests: 50 g of neem seed powder, neem khali, in the top layer of mix, as soil hygiene.
• General weak growth, no clear pattern: a plant growth promoter blend at 100 g per pot, about ₹29 per 100 g feed at ₹259 for 900 g.

All four sit in the SatRas plant care range. Expect the cake to take 7 to 10 days to act, as TNAU notes for oil cakes, and look for recovery in the next new leaves, not the yellow ones. For symptom-by-symptom matching, see which organic garden input fixes which problem.

What should you avoid when leaves turn yellow?

Avoid feeding before you have checked the water, using wood ash on a plant with yellow new leaves, and treating every yellow leaf as an emergency. One old leaf yellowing at the base while the rest of the plant is green is simply ageing. Change one thing at a time, or you'll never know what worked.

• Feeding a wet pot. It adds salts to roots that already cannot work.
• Ash on iron chlorosis. It raises pH and deepens the problem.
• Doubling doses. Overfeeding burns roots and yellows leaf edges too.

Frequently asked questions

Should I cut off yellow leaves?

Yes, once they are mostly yellow. A leaf that has lost its chlorophyll will not recover, and removing it tidies the plant and lets you see whether new leaves are coming in green. Leave partly yellow leaves until you have fixed the cause, since they still feed the plant, and bin diseased ones rather than composting them.

Can Epsom salt fix yellow leaves?

Only when magnesium is the cause, which shows as yellowing between green veins on older leaves. On nitrogen, iron or water problems it does nothing. Where magnesium is short, a dilute solution of about 20 g per litre sprayed or watered over the leaves, repeated a few times, is the usual treatment.

Why are my money plant leaves turning yellow?

Usually overwatering or too little light, the two classic indoor causes. Money plant likes its mix to dry slightly between waterings and a bright spot out of harsh sun. Lower leaves yellowing slowly on a long vine are often just ageing. Feed lightly; it needs far less than most people give it.

Do yellow leaves mean the plant is dying?

Rarely. Most yellowing is a stress signal from a plant that is otherwise alive, and it recovers once the cause is fixed. The warning signs are yellowing with a soft, dark stem base, roots that are brown and mushy, or new growth coming in yellow as well. Those need action within days.

Why do indoor plants get yellow leaves in winter?

Shorter days and weaker light slow growth, so the plant drinks less while most owners keep watering at the summer rate. The mix stays wet, roots suffer, and lower leaves yellow. Cut watering back in November, move plants closer to a bright window, and hold off feeding until growth restarts in spring.

Can hard tap water cause yellow leaves?

Over time, sometimes. Hard water carries dissolved carbonates that can push the pH of potting mix upwards, and a higher pH locks up iron, which yellows the newest leaves between green veins. Watering until it drains freely, flushing pots every few months, and using stored rainwater where possible all help.