Check these first
- Feel the soil at least 2 inches deep to see if it is damp.
- Inspect the drainage holes to ensure they are not blocked.
- Check the base of the plant for soft or discolored stems.
Likely causes
Overwatering
Most likelyHow to tell: The base of the stem turns mushy or black and the plant emits a sour smell.
What to do: Stop watering immediately and let the soil dry out completely. If the rot is advanced, remove the plant from the pot, trim away any black or slimy roots, and repot in fresh, sandy soil.
Poor Drainage
Most likelyHow to tell: Water pools on the surface of the soil or sits in the bottom of the pot after watering.
What to do: Ensure your pot has large drainage holes at the bottom. Use a gritty, fast-draining soil mix designed for Mediterranean herbs to prevent water from sitting around the roots.
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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
If the entire base of the plant feels soft or the foliage has collapsed, the damage is likely too far gone to save. Even slight wilting in a very humid environment can be an early sign of root rot, so check the soil and roots before assuming the plant is fine.
Stopping it coming back
Always wait until the soil is completely dry before watering again. Use a terracotta pot to help moisture evaporate more quickly.
White horehound: root rot? 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Can I save a plant with root rot?
- Yes, if you catch it early. Trim the dead roots and repot in dry soil, then wait at least two weeks before watering again.
- How often should I water my white horehound?
- Water every 7 to 14 days depending on the heat. Always check that the soil is bone dry before adding more water.
More problems with White horehound
- Why are there tiny bugs on my White horehound?
- Why does my White horehound have white spots on its leaves?
- Why is my White horehound growing so tall and thin?
- Why are my white horehound leaves turning yellow?
- Why is my white horehound drooping?
- Why is my white horehound not flowering?
- Why are my white horehound leaves curling?
Back to the White horehound guide
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.

