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Pacific madrone · Arbutus menziesii

Why are my Pacific madrone's leaves turning yellow?

It is less common for this plant to have yellow leaves, which usually happens due to nutrient deficiencies or improper soil pH. Check your soil quality and recent fertilizer use first.

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

Check these first

  1. Check the leaves for signs of fungal lesions or spots.
  2. Test the soil pH to ensure it is not too alkaline.
  3. Look for signs of pests that might be sucking sap.

Likely causes

  1. Nutrient deficiency

    Possible

    How to tell: The leaves turn yellow while the veins remain green, often indicating a lack of iron or magnesium. This happens when the soil pH is too high for the tree to absorb nutrients.

    What to do: Test your soil pH to see if it is too alkaline, and check nutrient levels at the same time. Only apply a light, balanced, slow release fertilizer if the test shows a real deficiency, since madrones are adapted to poor soils and can be harmed by too much fertilizer.

  2. Madrone Canker

    Possible

    How to tell: Leaves turn yellow and drop prematurely on specific branches that also show sunken lesions on the bark. This fungal infection disrupts the flow of water and nutrients to the leaves.

    What to do: Prune out the infected branches well below the visible canker. Sterilize your pruning shears with alcohol between every cut to prevent spreading the fungus.

Yellow leaves on other plants

Find out what's wrong with your pacific madrone

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

Yellowing is normal if it is just a few older leaves dropping in late summer. It is serious if the yellowing spreads rapidly across the entire canopy.

Stopping it coming back

Keep the area around the base of the tree clean and free of debris. Avoid wounding the bark with lawn equipment, as this creates entry points for fungi.

Pacific madrone: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your pacific madrone 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

Do madrones need fertilizer?
Generally, no. They are adapted to poor soils and often suffer if over fertilized.
Is yellowing a sign of drought?
Sometimes, but usually drought causes leaves to brown and curl first. Yellowing is more often related to soil chemistry or disease.

More problems with Pacific madrone

Back to the Pacific madrone 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.