Pocket Botanist
Check these first
- Assess the light levels in your plant's current location.
- Check if the plant is leaning toward a window.
- Inspect the stems for signs of new, compact growth.
Likely causes
Insufficient Light
Most likelyHow to tell: The stems grow long and sparse with large gaps between the leaves. The plant leans heavily toward the nearest window.
What to do: Move your plant to a spot that receives at least 6 hours of bright, indirect light daily. If you cannot provide natural light, place it under a full spectrum grow light for 10 to 12 hours a day.
Lack of Pruning
PossibleHow to tell: It is less common for this plant to become leggy solely from age, but it often happens when old growth is left to sprawl. The plant looks woody at the base and sparse on the ends.
What to do: Trim back the stems by one third in early spring to encourage bushy, compact growth. Use clean, sharp shears to make cuts just above a leaf node.
Find out what's wrong with your black 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 plant to stretch slightly during the dark winter months. Worry only if the stems become so weak they cannot support their own weight.
Stopping it coming back
Rotate your pot every week to ensure even light exposure on all sides. Prune your plant annually to maintain a dense, healthy shape.
Black horehound: leggy growth? Check yours with a photo
Every plant is a little different. Take a photo of your black 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
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Questions people ask
- Can I fix a leggy stem by just cutting it?
- Yes, cutting back a leggy stem will force the plant to sprout new, stronger growth from the nodes below. Make sure to provide plenty of light after pruning.
- Will my plant ever grow back to be bushy?
- With proper light and regular pruning, your black horehound will fill out nicely. It takes a few weeks of consistent care to see the difference.
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Back to the Black 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.