Does powdery mildew kill the plant?

It can weaken the plant and stunt its growth if left untreated. Catching it early by improving airflow usually solves the problem.

Should I mist the leaves?

No, misting can actually encourage powdery mildew on this plant. It is better to keep the leaves dry and water the soil directly.

Guascas: curling leaves, causes and fixes

Check these first

Check the undersides of the leaves for tiny pests.
Look for a white powdery coating on the leaves.
Feel the soil to see if the plant is thirsty.

Likely causes

Heat stress
Most likely
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture.
What to do: Provide some afternoon shade if the plant is in intense, direct sun. Ensure the soil stays damp to help the plant handle the heat.
Powdery mildew
Possible
How to tell: Leaves curl and develop a white, dusty coating on the surface.
What to do: Improve air circulation around the plant to reduce moisture on the leaves. You can wipe the leaves with a damp cloth or use a mild fungicide if the infection is heavy.

Curling leaves on other plants

Find out what's wrong with your guascas

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 curling is accompanied by yellowing or spots, the plant is likely sick. If the leaves curl slightly in the heat but flatten out at night, the plant is doing fine.

Stopping it coming back

Keep the leaves dry when watering and ensure there is good airflow around the plant.

Guascas: curling leaves? Check yours with a photo

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

Does powdery mildew kill the plant?: It can weaken the plant and stunt its growth if left untreated. Catching it early by improving airflow usually solves the problem.
Should I mist the leaves?: No, misting can actually encourage powdery mildew on this plant. It is better to keep the leaves dry and water the soil directly.

Guides to these causes

Powdery Mildew

Why are my Galinsoga parviflora leaves curling?