Is powdery mildew fatal?

It is rarely fatal but can weaken the plant significantly. Treat it early to keep your fleabane healthy.

Can I compost the spotted leaves?

It is better to throw them in the trash. Composting might not get hot enough to kill the fungal spores.

Philadelphia fleabane: spots, causes and fixes

Check these first

Look for white dust on the leaves.
Check if the leaves are wet for too long.
Inspect the spacing between plants.

Likely causes

Powdery Mildew
Most likely
How to tell: You see white, powdery patches on the leaf surfaces.
What to do: Improve air circulation by spacing plants further apart. Apply a neem oil spray or a mild fungicide to the affected areas.
Leaf Spot Disease
Possible
How to tell: Small brown or black spots appear on the leaves, often with a yellow halo.
What to do: Remove the infected leaves immediately to stop the spread. Avoid overhead watering to keep the foliage dry.

Leaf spots on other plants

Find out what's wrong with your philadelphia fleabane

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

If the spots cover most of the leaf surface, the plant will struggle to photosynthesize. Small, isolated spots are usually manageable.

Stopping it coming back

Water at the base of the plant to keep leaves dry and ensure good airflow.

Philadelphia fleabane: spots? Check yours with a photo

Every plant is a little different. Take a photo of your philadelphia fleabane 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

Is powdery mildew fatal?: It is rarely fatal but can weaken the plant significantly. Treat it early to keep your fleabane healthy.
Can I compost the spotted leaves?: It is better to throw them in the trash. Composting might not get hot enough to kill the fungal spores.

Why does my Philadelphia fleabane have spots?

Check these first

Likely causes

Powdery Mildew

Leaf Spot Disease

Find out what's wrong with your philadelphia fleabane

When to worry

Stopping it coming back

Philadelphia fleabane: spots? Check yours with a photo

Questions people ask

Guides to these causes

More problems with Philadelphia fleabane