Is powdery mildew contagious?

Yes, it spreads easily through the air. Keep infected plants away from other susceptible species if possible.

Should I cut off all the curled leaves?

If the curling is caused by mildew, remove the worst leaves to reduce the spore count. If it is just heat stress, leave them alone as they will recover.

Why are my rose leaves curling up? Causes and fixes

Check these first

Rub the leaf to see if the white powder comes off.
Check if the leaves look normal in the early morning.
Examine the underside of the leaf for hidden pests.

Likely causes

Powdery Mildew
Most likely
How to tell: Leaves look like they have been dusted with flour or white powder. This causes the leaves to twist, curl, and eventually turn brown.
What to do: Improve air circulation by thinning out the plant. Apply a fungicide or a mix of one tablespoon of baking soda in a gallon of water to treat the leaves.
Heat Stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. They usually recover once the sun goes down.
What to do: Ensure the plant is getting enough water during dry spells. Apply a layer of mulch around the base to keep the roots cool and moist.

Curling leaves on other plants

Find out what's wrong with your rose

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

It is normal for leaves to curl slightly during extreme heat. You should worry if the curling is accompanied by white spots or if the leaves are turning brittle.

Stopping it coming back

Plant roses in a spot with full sun and good airflow to prevent fungal issues from starting.

Rose: curling leaves? Check yours with a photo

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

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Questions people ask

Is powdery mildew contagious?: Yes, it spreads easily through the air. Keep infected plants away from other susceptible species if possible.
Should I cut off all the curled leaves?: If the curling is caused by mildew, remove the worst leaves to reduce the spore count. If it is just heat stress, leave them alone as they will recover.

Guides to these causes

Powdery Mildew

Why are my rose leaves curling up?

Check these first

Not sure what's wrong with your rose?