Why Are My Plant's Leaves Turning Yellow?

Yellow leaves are your plant's most common distress signal — and the most ambiguous one. The same yellow leaf can mean too much water, too little light, or a hungry plant. Here's how to tell the causes apart, and how to get a diagnosis from a photo instead of guessing.

The 6 causes of yellowing leaves

1. Overwatering (the most common)

Soggy soil suffocates roots, and the plant yellows from the bottom up. The soil stays wet days after watering; stems may feel soft. Fix: let the top 5 cm of soil dry out, check the pot drains, and water less often — not less deeply.

2. Underwatering

Leaves yellow, then crisp at the edges, and the pot feels light. Fix: soak thoroughly until water runs from the drainage holes, then set a realistic schedule.

3. Not enough light

Lower and inner leaves yellow and drop while growth gets leggy. Fix: move the plant closer to a window or add a grow light.

4. Nutrient deficiency

Nitrogen deficiency yellows old leaves evenly; iron deficiency yellows new leaves between green veins. Fix: feed with a balanced fertilizer during the growing season.

5. Pests

Spider mites and aphids leave stippled, speckled yellowing and sticky residue or fine webbing. Fix: isolate the plant and treat with insecticidal soap or neem oil.

6. Natural aging

One or two old bottom leaves yellowing occasionally is normal. No action needed.

Stop guessing: diagnose it from a photo

Telling cause 1 from cause 4 by eye is genuinely hard — this is exactly what Plantico's disease diagnosis is built for. Photograph the yellowing leaves and the app analyzes the pattern (which leaves, what distribution, what accompanying symptoms) and identifies the likely cause — overwatering, deficiency, pest or fungus — with a step-by-step treatment plan. The before/after care tips then help you track recovery.

How to prevent yellow leaves

• Water on the plant's schedule, not the calendar — Plantico's per-plant reminders adjust to the species.
• Match the plant to the light you actually have.
• Feed lightly in spring and summer.
• Scan your plants monthly so problems are caught while they're one leaf, not the whole plant.