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black bindweed · Fallopia convolvulus

Why are there spots on my black bindweed leaves?

Spots on your black bindweed are often caused by powdery mildew, a common fungal issue. Check the leaves for a white, dusty coating that looks like flour.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Look closely at the leaves for a white, dusty texture.
  2. Check if the plant is crowded by other plants.
  3. Ensure the leaves stay dry during watering.

Likely causes

  1. Powdery Mildew

    Most likely

    How to tell: White, powdery patches appear on the surface of the leaves, often starting on older foliage.

    What to do: Improve air circulation by spacing out your plants. You can wipe leaves with a mixture of 1 teaspoon of baking soda in 1 quart of water.

  2. Fungal Leaf Spot

    Possible

    How to tell: Small brown or black spots with yellow halos appear on the leaves.

    What to do: Remove the affected leaves to stop the spread. Avoid watering from above to keep the foliage dry.

Leaf spots on other plants

Find out what's wrong with your black bindweed

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

If the spots cover more than half of the leaf surface, the plant will struggle to photosynthesize and may decline.

Stopping it coming back

Provide plenty of space between plants for airflow and water only at the base of the plant.

Black bindweed: spots? Check yours with a photo

Every plant is a little different. Take a photo of your black bindweed 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?
It weakens the plant over time by blocking sunlight. It is best to treat it as soon as you see it.
Does humidity cause spots?
High humidity combined with poor airflow is the perfect environment for fungal growth.

Guides to these causes

More problems with black bindweed

Back to the black bindweed 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.