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Cottonwood · Populus

Why are my poplar leaves turning yellow?

Yellowing leaves on a poplar often signal an issue with soil moisture or nutrient uptake. Since poplars love consistent moisture, the first thing to check is your watering schedule. Ensure the soil is damp but not sitting in water.

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yellow leaves on a plant
Photo: Trio3D, CC BY-SA 4.0

Check these first

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

Likely causes

  1. 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.

  2. 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.

Yellow leaves on other plants

Find out what's wrong with your cottonwood

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.

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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.

Cottonwood: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your cottonwood 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.

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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.

More problems with Cottonwood

Back to the Cottonwood guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.