Iron Chlorosis: Yellow Leaves With Green Veins

If your plant has yellow leaves but the veins stay a deep green, it isn't just ordinary yellowing: it's iron chlorosis, a shortage of available iron. It's very common in citrus, hydrangeas, gardenias and many houseplants. The good news is that it's fixable once you understand the real cause.

How to identify it

The pattern is unmistakable:

• The leaf turns yellow or nearly white, but the veins stay green, forming a net.
• It starts on the new leaves (the top ones), because iron doesn't move around inside the plant.
• In severe cases the edges turn brown and the leaf dries out.

The fact that it hits young leaves first is the key to telling it apart from other deficiencies. If the yellowing starts on the old lower leaves, it's probably something else: check our yellow leaves guide.

Deficiency	Where it starts	Pattern
Iron (iron chlorosis)	New leaves (top)	Yellow with fine green veins
Magnesium	Old leaves (bottom)	Yellow between veins, veins green
Nitrogen	Old leaves (bottom)	Uniform yellow, no green net

Why it happens (it's rarely a lack of iron)

The surprising part: usually there is iron in the soil, but the plant can't absorb it. The common causes are:

pH too high

Iron gets locked up in chalky (alkaline) soils and water. If you water with hard tap water, the pH slowly creeps up and iron stops being available. This is the number-one cause.

Overwatering or poor drainage

Waterlogged roots can't take up nutrients well. Constantly soggy soil can trigger chlorosis even with plenty of iron present.

Exhausted soil or damaged roots

In old pots that haven't been refreshed, or with roots hit by rot, absorption breaks down.

How to fix it

Address the cause, not just the symptom:

1. Check your watering. Let the top inch dry between waterings and make sure drainage is good.
2. Lower the pH. For acid-loving plants, use acidic soil and occasionally water with rainwater or a few very diluted drops of vinegar/lemon.
3. Supply available iron. Iron chelate (especially EDDHA, which holds up at high pH) is the most effective remedy. Always follow the label dose.
4. Refresh the soil. If the pot has been the same for years, repotting with fresh soil and a little compost helps a lot.

Iron chelate greens things up, but if you don't fix the pH and watering, the chlorosis will return. Treat the cause.

How long it takes to improve

Already-yellow leaves rarely turn fully green again — the damage is done. What you'll see is that new leaves emerge green and healthy within about 2-4 weeks. That's the sign you're on the right track.

How to prevent it

• Use the right soil for each plant (acidic for hydrangeas, gardenias, citrus).
• Water with rainwater if your tap water is very hard.
• Feed during the growing season with a fertilizer that includes micronutrients.

If you're unsure whether it's iron chlorosis or another deficiency, upload a photo to our AI diagnosis and it'll help you identify the problem in seconds.

With the pH under control, correct watering and an occasional iron boost, your plant will be sporting healthy green leaves again.