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Check these first
- Move the plant to a location with more direct sunlight.
- Check the underside of the leaves for signs of aphids.
- Examine the soil to see if it has been depleted of nutrients.
Likely causes
Insufficient Light
Most likelyHow to tell: The leaves turn pale yellow and the stems become long and thin as they reach for light.
What to do: Move your plant to a spot that receives full, direct sun for at least 6 to 8 hours a day. If you are growing indoors, place it in your sunniest south-facing window.
Nutrient Deficiency
PossibleHow to tell: Older leaves turn yellow while the veins remain green, suggesting a lack of nitrogen or iron.
What to do: Apply a balanced, organic fertilizer diluted to half strength once in the early spring. Do not overfeed, as this plant prefers lean soil.
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.
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When to worry
It is normal for the very bottom leaves to turn yellow and drop as the plant ages. If the yellowing is spreading to the top of the plant or affecting new growth, you should take action.
Stopping it coming back
Provide plenty of direct sunlight and avoid using heavy, moisture-retentive fertilizers. Keep the plant in a well-ventilated area to prevent fungal issues.
White horehound: yellow 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.
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
- Does white horehound need fertilizer?
- It is a hardy plant that needs very little. A light feeding once a year in spring is plenty.
- Could yellow leaves mean my plant is thirsty?
- Usually, a thirsty plant will droop or crisp up rather than turn yellow. Yellowing is more often related to light or soil drainage.
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 is my white horehound suffering from root rot?
- 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.