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French lavender · Lavandula stoechas

Why are there dark spots on my French lavender leaves?

Spots on French lavender are often a sign of fungal growth triggered by high humidity or poor air circulation. Check the undersides of the leaves for signs of moisture buildup.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the leaves for fuzzy growth or dark lesions.
  2. Check if the plant is crowded by other vegetation.
  3. Verify the plant is receiving at least 6 to 8 hours of direct sun.

Likely causes

  1. Fungal Infection

    Most likely

    How to tell: Small dark or grey spots appear on the leaves, often spreading when the plant is kept in a humid or crowded space.

    What to do: Prune away the affected leaves to stop the spread. Move the plant to a location with full sun and better air movement to dry out the foliage.

  2. Poor Air Circulation

    Possible

    How to tell: The center of the plant stays damp for a long time after rain or watering. Leaves look dull and develop spots in the middle of the bush.

    What to do: Thin out the plant by pruning some inner branches to allow air to flow through. Ensure the plant is not crowded by other shrubs.

Leaf spots on other plants

Find out what's wrong with your french lavender

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 spots are manageable, but if they cover most of the foliage, the plant will struggle to photosynthesize. It is rarely fatal if you improve the environment quickly.

Stopping it coming back

Keep the plant in a sunny, breezy spot and avoid overhead watering to keep the leaves dry.

French lavender: spots? Check yours with a photo

Every plant is a little different. Take a photo of your french lavender 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 use a fungicide?
Usually, you do not need chemicals. Improving airflow and sun exposure is almost always enough to stop the spots from spreading.
Can I mist my lavender to keep it happy?
No, never mist your lavender. French lavender prefers dry air and will develop fungal issues if the leaves stay wet.

More problems with French lavender

Back to the French lavender 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.