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Carolina cranesbill · Geranium carolinianum

Why are there white spots on my Carolina cranesbill?

Those white spots are almost certainly powdery mildew, a common fungal issue for this plant. It happens when the air is humid and airflow is poor, so check your plant's location first.

Not sure it's this? Check a photo of your plant for free

spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the undersides of the leaves for signs of insects.
  2. Check if the plant is crowded by other garden neighbors.
  3. Feel the soil to see if it stays wet for too long.

Likely causes

  1. Powdery Mildew

    Most likely

    How to tell: You will see a white, dusty coating on the leaves that looks like flour. It usually starts on the upper leaf surface.

    What to do: Remove the most heavily affected leaves to stop the spread. Improve air circulation around the plant by thinning out nearby foliage. Avoid overhead watering to keep the leaves dry.

  2. Leaf Spot Disease

    Possible

    How to tell: These appear as distinct brown or black spots with yellow halos. They often show up after periods of heavy rain.

    What to do: Pick off and dispose of any infected leaves immediately. Keep the area around the base of the plant clean of debris. Apply a copper based fungicide if the infection continues to spread.

Leaf spots on other plants

Find out what's wrong with your carolina cranesbill

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 serious if the spots cover most of the foliage and cause the plant to stop growing. A few small spots are normal during damp spring weather.

Stopping it coming back

Space your plants out to ensure good airflow and always water at the base rather than over the leaves.

Carolina cranesbill: spots? Check yours with a photo

Every plant is a little different. Take a photo of your carolina cranesbill 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

Will the white spots kill my plant?
Usually no, but it weakens the plant and makes it look messy. Treating it early helps the plant recover quickly.
Can I wash the spots off?
You can wipe them off, but the fungus is still inside the leaf tissue. It is better to prune the affected leaves.

Guides to these causes

More problems with Carolina cranesbill

Back to the Carolina cranesbill 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.