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Garlic mustard · Alliaria petiolata

Why are my garlic mustard leaves turning yellow?

Garlic mustard usually turns yellow when it is getting too much sun or the soil has dried out completely. Check the soil moisture first to see if your plant is thirsty.

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

Check these first

  1. Touch the soil to check for dryness.
  2. Observe the light levels in your plant's current spot.
  3. Inspect the undersides of leaves for any signs of pests.

Likely causes

  1. Sunburn

    Most likely

    How to tell: The leaves look bleached or pale yellow, especially on the side facing the light source.

    What to do: Move the plant to a spot with more shade. Ensure it stays in partial to full shade throughout the day.

  2. Underwatering

    Possible

    How to tell: The soil feels dry and crumbly to the touch. The leaves may feel brittle before they turn yellow.

    What to do: Water your plant thoroughly until moisture runs out the drainage holes. Maintain a schedule of watering every 3 to 7 days.

Yellow leaves on other plants

Find out what's wrong with your garlic mustard

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

It is normal for the oldest bottom leaves to yellow as the plant matures. Worry if the yellowing spreads rapidly to new growth.

Stopping it coming back

Keep the soil consistently moist and protect the plant from harsh afternoon sun.

Garlic mustard: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your garlic mustard 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

Can I save a yellow leaf?
Usually no. Once a leaf turns yellow, it will not turn green again, so you can snip it off.
Is yellowing a sign of disease?
Rarely. It is almost always related to light or water issues.

Guides to these causes

More problems with Garlic mustard

Back to the Garlic mustard 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.