Can I wash the white spots off?

You can wipe them off, but the fungus will return unless you treat the plant. Use a baking soda solution to kill the spores.

Will these spots kill my plant?

If left untreated, powdery mildew can weaken the plant significantly. It is best to address it as soon as you notice the first signs.

Black henbane: spots, causes and fixes

Check these first

Inspect the leaves for a white, dusty coating.
Look for tiny holes indicating insect activity.
Check if the plant is crowded by other vegetation.

Likely causes

Powdery mildew
Most likely
How to tell: You will see a white, powdery substance coating the leaves. It often starts as small spots and spreads across the foliage.
What to do: Remove the most heavily affected leaves to stop the spread. Spray the plant with a mixture of one tablespoon of baking soda in a gallon of water. Ensure the plant has better airflow by spacing it away from other plants.
Flea beetle damage
Possible
How to tell: These pests leave behind tiny, round holes that can look like spots from a distance. Look closely for small, jumping beetles on the foliage.
What to do: Use a gentle stream of water to knock the beetles off the leaves. Apply neem oil to the foliage once a week until the beetles are gone. Keep the area around the plant clear of weeds where they might hide.

Leaf spots on other plants

Find out what's wrong with your black henbane

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 more than half of the foliage, the plant will struggle to photosynthesize. Minor spotting is manageable with quick treatment.

Stopping it coming back

Keep the foliage dry when watering and ensure your plant has plenty of space for air to circulate.

Black henbane: spots? Check yours with a photo

Every plant is a little different. Take a photo of your black henbane 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

Can I wash the white spots off?: You can wipe them off, but the fungus will return unless you treat the plant. Use a baking soda solution to kill the spores.
Will these spots kill my plant?: If left untreated, powdery mildew can weaken the plant significantly. It is best to address it as soon as you notice the first signs.

Why are there white spots on my Black henbane?

Check these first

Likely causes

Powdery mildew

Flea beetle damage

Find out what's wrong with your black henbane

When to worry

Stopping it coming back

Black henbane: spots? Check yours with a photo

Questions people ask

Guides to these causes

More problems with Black henbane