Why are my plant's leaves turning yellow?

Yellow leaves are one of the most common plant problems. The pattern of yellowing is the best clue to the cause.

Lower leaves turning yellow

If only the oldest leaves at the bottom are yellowing, it's often natural ageing. If it's widespread, it can mean a lack of nitrogen. Feed with a balanced fertiliser.

Yellow leaves and soggy compost

The most common cause in houseplants and pots: overwatering. Roots sitting in water can't take up oxygen. Let the compost dry out and check the pot drains freely.

Yellow between green veins

This pattern (chlorosis) usually means a lack of iron or magnesium, common on chalky soil or for acid-loving plants like blueberries and camellias. Use an ericaceous feed or a seaweed tonic.

Sudden yellowing after moving

Plants often drop a few leaves after a change of light or temperature. Give them a few weeks to adjust.

Yellow leaves with spots or patches

This can indicate a fungal disease or pests. Check the undersides of leaves for spider mites, aphids or scale insects.