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Woodland sage · Salvia nemorosa

Why are there spots on my Woodland sage leaves?

Spots on your sage leaves are often a sign of fungal issues caused by damp conditions. The most common culprit is powdery mildew, which looks like white dusty patches.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Look closely to see if the spots are white and dusty.
  2. Check the undersides of leaves for pests or eggs.
  3. Examine the soil surface for slug trails.

Likely causes

  1. Powdery Mildew

    Most likely

    How to tell: White, powdery spots appear on the surface of the leaves, often spreading to cover the whole leaf.

    What to do: Improve air circulation by thinning out crowded plants. You can also apply a neem oil spray or a fungicide specifically labeled for powdery mildew.

  2. Slug Damage

    Possible

    How to tell: Irregular holes or ragged spots on the leaves, often accompanied by slimy trails.

    What to do: Use slug bait or set out shallow dishes of beer to trap them. Keep the area around the base of the plant clean and free of debris where slugs hide.

Leaf spots on other plants

Find out what's wrong with your woodland sage

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

Small spots are rarely fatal, but heavy infestations can weaken the plant. Treat it early to prevent the fungus from spreading to the whole garden.

Stopping it coming back

Water at the base of the plant to keep leaves dry and ensure there is enough space between plants for air to move.

Woodland sage: spots? Check yours with a photo

Every plant is a little different. Take a photo of your woodland sage 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

Is powdery mildew harmful to my other plants?
Yes, it can spread quickly to other susceptible plants in your garden. It is best to treat it as soon as you see it.
Should I remove the spotted leaves?
If only a few leaves are affected, removing them can help stop the spread. Dispose of them in the trash, not your compost pile.

Guides to these causes

More problems with Woodland sage

Back to the Woodland sage 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.