Is it normal for my poplar to lose leaves in summer?

Some leaf drop is normal, but excessive yellowing suggests a problem with water or nutrients.

How much water does a mature poplar need?

They need deep, consistent watering, especially during hot, dry spells.

Why are my poplar leaves turning yellow?

Check these first

Feel the soil moisture level a few inches below the surface.
Check for signs of standing water around the base.
Look for yellowing on older leaves versus new growth.

Likely causes

Improper Watering
Most likely
How to tell: Leaves turn yellow and may wilt if the soil is too dry or soggy.
What to do: Check the soil moisture 2 to 3 inches down. Adjust your watering to every 7 to 14 days, ensuring the ground stays consistently moist.
Nutrient Deficiency
Possible
How to tell: General yellowing across the leaves, often starting with older foliage.
What to do: Apply a balanced, slow release fertilizer in early spring. Follow the package instructions for the size of your specific tree.

When to worry

A few yellow leaves in late summer is normal as the tree prepares for autumn. If the whole tree turns yellow prematurely, investigate immediately.

Stopping it coming back

Maintain a consistent watering schedule and mulch around the base to help the soil retain moisture.

Not sure which one it is? Photograph your cottonwood.

This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Is it normal for my poplar to lose leaves in summer?: Some leaf drop is normal, but excessive yellowing suggests a problem with water or nutrients.
How much water does a mature poplar need?: They need deep, consistent watering, especially during hot, dry spells.