Pocket Botanist
Check these first
- Examine the leaves for a white powdery substance.
- Check if the plant is crowded by other plants.
- Observe if the spots are spreading to new growth.
Likely causes
Powdery mildew
Most likelyHow to tell: White, floury patches appear on the top of the leaves.
What to do: Improve air circulation by spacing plants further apart. You can wipe leaves with a mix of one part milk to nine parts water or use a neem oil spray.
Fungal leaf spot
PossibleHow to tell: Dark brown or black spots with yellow halos appear on the foliage.
What to do: Remove the affected leaves immediately to stop the spread. Avoid overhead watering to keep the foliage dry.
Find out what's wrong with your common hedgenettle
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
A few spots are manageable, but if the entire plant is covered, it can weaken the hedgenettle significantly. Treat it early to prevent leaf loss.
Stopping it coming back
Water at the base of the plant rather than over the leaves to keep them dry. Provide plenty of space for air to move around the stems.
Common hedgenettle: spots? Check yours with a photo
Every plant is a little different. Take a photo of your common hedgenettle 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.
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Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Is powdery mildew harmful?
- It is mostly cosmetic but can stunt growth if left untreated. It is best to address it as soon as you see the white dust.
- Can I use a fungicide?
- You can, but natural remedies like neem oil or improved airflow are usually enough for common hedgenettle. Always follow the label instructions carefully.
Guides to these causes
More problems with Common hedgenettle
- Why is my Common hedgenettle drooping?
- Why is my Betonica officinalis rotting at the base?
- Why is my hedgenettle growing so tall and thin?
- Why are my Common hedgenettle leaves turning yellow?
- Why are the tips of my hedgenettle leaves turning brown?
- Why is my Betonica officinalis losing its leaves?
- Why won't my Betonica officinalis bloom?
- How do I get rid of pests on my Betonica officinalis?
- Why are my Betonica officinalis leaves curling?
Back to the Common hedgenettle 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.