Can I use a fungicide for these spots?

You can, but it is rarely needed for a healthy butterfly bush. Focus on cultural fixes like better airflow and proper watering first.

Are these spots contagious to other plants?

If the spots are caused by a fungus, they can spread to nearby plants in damp conditions. Keep the area clean and remove fallen leaves from the ground.

What are these spots on my butterfly bush? Causes and fixes

Check these first

Look for tiny webs on the underside of the spotted leaves.
Check if the spots are only on the lower, older leaves.
See if the spots are spreading to new growth.

Likely causes

Spider mites
Most likely
How to tell: The leaves show tiny yellow or white stippling spots. The foliage may look dusty or dull overall.
What to do: Increase humidity around the plant if possible and wash the leaves with water. Use neem oil if the mites persist after two weeks of washing.
Fungal leaf spot
Possible
How to tell: Dark or brown circular spots appear on the leaves, often with a yellow halo. This happens when the foliage stays wet for too long.
What to do: Remove and dispose of the affected leaves to stop the spread. Improve air circulation by pruning surrounding plants and avoid watering the leaves directly.

Find out what's wrong with your butterfly bush

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.

When to worry

Worry if the spots cover most of the leaf surface and cause the leaves to curl or drop. It is normal to see a few minor blemishes on older leaves at the end of the season.

Stopping it coming back

Plant your bush in a spot with full sun and plenty of space for air to move. Water at the base of the plant to keep the leaves dry.

Keep your butterfly bush healthy from here

Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.

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Questions people ask

Can I use a fungicide for these spots?: You can, but it is rarely needed for a healthy butterfly bush. Focus on cultural fixes like better airflow and proper watering first.
Are these spots contagious to other plants?: If the spots are caused by a fungus, they can spread to nearby plants in damp conditions. Keep the area clean and remove fallen leaves from the ground.

What are these spots on my butterfly bush?