Is powdery mildew fatal?

It is rarely fatal, but it makes the plant look unsightly and can reduce its vigor. It is best to treat it as soon as you see it.

Should I cut off spotted leaves?

Yes, removing infected leaves helps stop the spread of the fungus. Always dispose of them in the trash, not your compost pile.

Purpletop vervain: spots, causes and fixes

Check these first

Look closely at the spots to see if they are white and powdery.
Check if the plant is crowded by other vegetation.
Inspect the leaves for signs of moisture buildup.

Likely causes

Powdery Mildew
Most likely
How to tell: White, powdery patches appear on the leaves and stems.
What to do: Improve air circulation by thinning out nearby plants. You can also apply a neem oil spray or a mixture of water and baking soda to the affected leaves.
Fungal Leaf Spot
Possible
How to tell: Dark or brown spots with yellow halos appear on the foliage.
What to do: Remove and discard the infected leaves immediately. Avoid overhead watering to keep the foliage dry.

Leaf spots on other plants

Find out what's wrong with your purpletop vervain

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

A few spots are common in late summer, but if the whole plant is covered, it will weaken the vervain. Treat it early to prevent it from spreading.

Stopping it coming back

Space your plants well to ensure good airflow and water at the base of the plant rather than over the leaves.

Purpletop vervain: spots? Check yours with a photo

Every plant is a little different. Take a photo of your purpletop vervain 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 it makes the plant look unsightly and can reduce its vigor. It is best to treat it as soon as you see it.
Should I cut off spotted leaves?: Yes, removing infected leaves helps stop the spread of the fungus. Always dispose of them in the trash, not your compost pile.

What are these spots on my Purpletop vervain?

Check these first

Likely causes

Powdery Mildew

Fungal Leaf Spot

Find out what's wrong with your purpletop vervain

When to worry

Stopping it coming back

Purpletop vervain: spots? Check yours with a photo

Questions people ask

Guides to these causes

More problems with Purpletop vervain