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Marram grass · Ammophila arenaria

Why are my Marram grass leaves turning yellow?

Yellowing leaves on Marram grass often indicate that the plant is getting too much water or not enough sun. Check the soil drainage first to ensure the roots are not sitting in mud.

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

Check these first

  1. Check the soil moisture to ensure it is not waterlogged.
  2. Verify the plant is getting at least 6 to 8 hours of direct sun.
  3. Examine the base of the plant for signs of rot.

Likely causes

  1. Poor drainage

    Most likely

    How to tell: The entire plant looks pale and yellow. The soil may smell sour or feel soggy to the touch.

    What to do: Ensure the plant is in sandy, well-draining soil. If it is in a pot, make sure the drainage holes are not blocked.

  2. Insufficient light

    Possible

    How to tell: The grass grows tall and weak with yellowing blades. This happens when the plant is shaded by trees or buildings.

    What to do: Move the plant to a spot that receives full, direct sun for most of the day. Marram grass requires intense light to stay vibrant.

When to worry

Yellowing is normal during the dormant winter season as the plant dies back. Worry if it happens during the peak growing season in summer.

Stopping it coming back

Plant in sandy, loose soil that mimics its natural dune habitat. Avoid overwatering once the plant is established.

Not sure which one it is? Photograph your marram grass.

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

Does Marram grass need fertilizer?
No, it is adapted to nutrient-poor soil. Fertilizing can actually cause weak, yellow growth.
How often should I water it?
Once established, it rarely needs water. During the first year, water every 7 to 14 days only if there is a severe drought.

More problems with Marram grass

Back to the Marram grass guide

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