Is yellowing always a disease?

No, it is often a sign of environmental stress or nutrient imbalance. Check your soil conditions before assuming it is a disease.

Does my tree need fertilizer?

Only if a soil test shows a lack of nutrients. Over fertilizing can actually cause more harm than good.

Sweet chestnut: yellow leaves, causes and fixes

Check these first

Check the soil moisture level.
Look for signs of pests on the underside of the leaves.
Test the soil pH if the yellowing is widespread.

Likely causes

Nutrient deficiency
Most likely
How to tell: Leaves turn yellow while veins remain green, often indicating iron or magnesium deficiency.
What to do: Test your soil pH, as chestnuts prefer slightly acidic soil. Apply a balanced fertilizer or a chelated iron supplement if the soil test confirms a deficiency.
Water stress
Possible
How to tell: Leaves turn yellow and crispy during a hot, dry summer.
What to do: Deeply water the tree once every 10 to 14 days. Apply a layer of mulch around the base to help retain soil moisture.

Yellow leaves on other plants

Find out what's wrong with your sweet chestnut

The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

When to worry

Yellowing in late autumn is normal as the tree prepares for winter. Yellowing in midsummer is a sign that something is wrong.

Stopping it coming back

Maintain a consistent watering schedule and keep the soil pH in the ideal range of 5.5 to 6.5.

Sweet chestnut: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your sweet chestnut and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Is yellowing always a disease?: No, it is often a sign of environmental stress or nutrient imbalance. Check your soil conditions before assuming it is a disease.
Does my tree need fertilizer?: Only if a soil test shows a lack of nutrients. Over fertilizing can actually cause more harm than good.

Why are my sweet chestnut leaves turning yellow?