Pocket Botanist
Check these first
- Examine the undersides of the leaves for tiny insects.
- Check if the water in the container has become murky or foul smelling.
- Ensure the plant is getting enough direct sunlight.
Likely causes
Fungal leaf spot
Most likelyHow to tell: Small brown or black circular spots appear on the leaves, sometimes with a yellow halo.
What to do: Remove the affected leaves to stop the spread. Improve air circulation around the plant by moving it to a more open area.
Aphid damage
PossibleHow to tell: Tiny clusters of insects appear on the stems, leaving behind sticky residue that attracts mold and causes spots.
What to do: Spray the leaves with a gentle stream of water to wash the aphids away. If they persist, use an insecticidal soap specifically labeled for aquatic plants.
Find out what's wrong with your broadleaf cattail
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
Worry if the spots are rapidly spreading across the entire plant. A few small spots are usually just a minor reaction to environmental changes.
Stopping it coming back
Avoid overhead watering and ensure the plant has plenty of space for air to move around the foliage.
Broadleaf cattail: spots? Check yours with a photo
Every plant is a little different. Take a photo of your broadleaf cattail 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
- Are these spots contagious to other plants?
- If the spots are fungal, they can spread through water splashes. Keep infected plants away from your other water features until they recover.
- Do I need a fungicide?
- Usually, you do not need chemicals. Simply removing the damaged leaves and improving the environment is enough to fix the issue.
Guides to these causes
More problems with Broadleaf cattail
Back to the Broadleaf cattail 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.