Pocket Botanist
Check these first
- Inspect the undersides of the leaves for fungal growth.
- Check if the plants are planted too close together.
- Observe if the leaves stay wet long after it rains.
Likely causes
Fungal Leaf Spot
Most likelyHow to tell: You will see small brown or black circular spots on the leaves, often with a yellow halo. These appear most often during humid or rainy weather.
What to do: Remove and destroy any infected leaves immediately to stop the spread. Improve airflow by thinning out dense patches of the plant.
Overhead Watering
PossibleHow to tell: Leaves stay wet for long periods, creating the perfect environment for fungi. This is common if you use a sprinkler system.
What to do: Switch to watering at the base of the plant using a soaker hose or watering can. Avoid wetting the leaves during the evening hours.
Find out what's wrong with your goutweed
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
If the spots cover more than half the foliage, the plant may struggle to photosynthesize. Minor spotting is normal in very wet summers.
Stopping it coming back
Keep the foliage dry by watering at the soil level and ensure there is enough space between plants for air to move.
Goutweed: spots? Check yours with a photo
Every plant is a little different. Take a photo of your goutweed 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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Questions people ask
- Should I use a fungicide?
- Usually, it is not necessary for Goutweed. Improving airflow and removing infected leaves is almost always enough.
- Will the spots go away?
- No, the damaged tissue will not heal. You should prune off the affected leaves to keep the plant looking tidy.
Guides to these causes
More problems with Goutweed
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.