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Marsh willowherb · Epilobium palustre

Why are my Marsh willowherb leaves turning yellow?

Yellowing leaves are less common for this plant and usually point to issues with soil moisture or nutrient balance. Check your watering schedule first to ensure the soil stays consistently damp.

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

Check these first

  1. Touch the soil to see if it feels soggy or dry.
  2. Inspect the drainage holes to ensure they are not blocked.
  3. Check the underside of the leaves for any signs of pests.

Likely causes

  1. Overwatering

    Most likely

    How to tell: The lower leaves turn yellow and feel mushy to the touch. The soil may smell sour or remain waterlogged for days.

    What to do: Reduce watering frequency slightly so the soil stays moist but not swampy. Ensure your pot has drainage holes to let excess water escape.

  2. Nutrient Deficiency

    Possible

    How to tell: Older leaves turn yellow while the veins remain green. This often happens if the plant has been in the same soil for a long time.

    What to do: Apply a balanced liquid fertilizer diluted to half strength once every 4 to 6 weeks during the growing season. If the plant is very root bound, consider repotting into fresh, nutrient rich soil.

Yellow leaves on other plants

Find out what's wrong with your marsh willowherb

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 very oldest leaves at the base to yellow and die back as the plant grows. Worry if the yellowing spreads rapidly to newer, upper leaves.

Stopping it coming back

Keep the soil consistently moist but never sitting in standing water. Use a well draining potting mix that holds moisture without compacting.

Marsh willowherb: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your marsh willowherb 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

Should I cut off the yellow leaves?
Yes, you can snip them off with clean scissors to keep the plant looking tidy. This also helps you spot if new yellowing occurs.
Can low light cause yellowing?
Yes, if the plant is in a very dark corner, it may struggle to support all its foliage. Try moving it to a spot with brighter, indirect light.

More problems with Marsh willowherb

Back to the Marsh willowherb 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.