Should I throw away the infected leaves?

Yes, put them in the trash rather than the compost pile. This prevents the fungus from spreading to other plants in your garden.

Is the white stuff a bug?

No, it is a fungus. It looks like flour or dust sprinkled on the leaves.

Feverfew: spots, causes and fixes

Check these first

Check if the white spots rub off easily with your finger.
Look at the spacing between your plants.
Feel the soil to see if it stays wet for too long.

Likely causes

Powdery mildew
Most likely
How to tell: You will see a white, powdery dusting on the surface of the leaves. It often starts on older leaves and spreads upward.
What to do: Remove the most heavily infected leaves to improve airflow. Spray the remaining foliage with a mixture of one tablespoon of baking soda in a gallon of water.
Poor air circulation
Possible
How to tell: The plant is crowded by other plants or placed in a stagnant corner. The leaves stay damp for too long after watering.
What to do: Prune back surrounding plants to allow more air to move around your Feverfew. Ensure it is placed in a spot with good natural breezes.

Leaf spots on other plants

Find out what's wrong with your feverfew

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

Mildew is rarely fatal but it makes the plant look unsightly and weakens it over time. Treat it as soon as you notice the first white patches.

Stopping it coming back

Water at the base of the plant rather than overhead to keep the leaves dry. Ensure the plant has plenty of space for air to circulate.

Feverfew: spots? Check yours with a photo

Every plant is a little different. Take a photo of your feverfew 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.

Get the app · Or check it from a photo now, free

Questions people ask

Should I throw away the infected leaves?: Yes, put them in the trash rather than the compost pile. This prevents the fungus from spreading to other plants in your garden.
Is the white stuff a bug?: No, it is a fungus. It looks like flour or dust sprinkled on the leaves.

Guides to these causes

Powdery Mildew

Why does my Feverfew have white spots on its leaves?