Overwatering

The classic cause. Soil stays wet, roots suffocate, leaves yellow and wilt. Fix: let it dry out and check the roots.

Under-watering

Crispy, dry yellow edges on an obviously parched plant. Fix: a deep, thorough watering.

Light Starvation

Lower leaves yellow and drop as the plant moves resources to new growth in low light. Fix: brighter spot.

Salt Build-up

Brown or yellow leaf tips with a white crust on the soil from over-fertilising. Fix: flush the pot with plain water.

Natural Ageing

Oldest leaves yellow and fall as part of life. Only worry if it is widespread or sudden.

Frequently Asked Questions

Q: How do I tell over- from under-watering?

A:

Feel the soil -- wet and yellow means too much, dry and crispy means too little.

Q: Should I cut yellow leaves?

A:

If fully yellow, yes; if partly green, leave them to feed the plant.

Yellow is a symptom, not a disease. Match the pattern to the cause above, or use the pest identifier to rule pests out.