Can overwatering cause curling?

Yes, if the roots are sitting in soggy soil, they may struggle to take up water, causing the leaves to curl and wilt. Always let the soil dry out completely.

Are curled leaves permanent?

Often, the affected leaves will remain curled even after the pest or heat issue is resolved. Focus on the health of the new growth emerging afterward.

Why are my white horehound leaves curling? Causes and fixes

Check these first

Inspect the undersides of the curled leaves for tiny insects.
Check the soil moisture to see if the plant is bone dry.
Observe if the leaves uncurl during the cooler evening hours.

Likely causes

Aphid Infestation
Most likely
How to tell: You will see small green or black insects clustering on the new growth or the undersides of leaves. The leaves may look distorted or sticky from honeydew.
What to do: Spray the plant with a strong stream of water to knock the aphids off. For persistent cases, apply insecticidal soap once a week until the insects are gone.
Heat Stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. The plant usually looks fine again once the sun goes down.
What to do: Ensure you are watering deeply every 7 to 14 days, allowing the soil to dry out completely in between. If the heat is extreme, a light layer of mulch can help keep the roots cool.

Curling leaves on other plants

Find out what's wrong with your white horehound

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 a heatwave to protect themselves. You should worry if the curling is accompanied by yellowing or if you see a large colony of aphids.

Stopping it coming back

Keep the plant healthy with proper watering and check for pests regularly during the spring.

White horehound: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your white horehound 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 overwatering cause curling?: Yes, if the roots are sitting in soggy soil, they may struggle to take up water, causing the leaves to curl and wilt. Always let the soil dry out completely.
Are curled leaves permanent?: Often, the affected leaves will remain curled even after the pest or heat issue is resolved. Focus on the health of the new growth emerging afterward.

Guides to these causes

Aphids

Why are my white horehound leaves curling?