Pocket Botanist
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Check these first
- Inspect the stems for small clusters of insects.
- Check if the soil or water level has dropped.
- Look for sticky residue on the leaves.
Likely causes
Aphid infestation
Most likelyHow to tell: You will see small, soft-bodied insects clinging to the stems or leaves. They often leave behind a sticky residue called honeydew.
What to do: Gently spray the plant with a steady stream of water to knock the aphids off. If they persist, wipe the stems with a mild soap and water solution once a week.
Drought stress
PossibleHow to tell: The plant looks weak and the soil is dry to the touch. Aphids prefer stressed plants that are not getting enough moisture.
What to do: Ensure the container or pond stays filled with water at all times. Keep the soil saturated daily to prevent the plant from weakening.
Find out what's wrong with your floating sweet-grass
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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
Worry if the aphids are covering the entire plant and causing the leaves to curl. A few bugs are manageable, but a full colony can stunt growth.
Stopping it coming back
Keep your sweet-grass constantly submerged or in very wet soil to maintain its natural defenses. Monitor the stems weekly during warmer months.
Floating sweet-grass: pests? Check yours with a photo
Every plant is a little different. Take a photo of your floating sweet-grass 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
- Can I use chemical pesticides?
- Avoid harsh chemicals, especially if your plant is in a pond with fish or other wildlife. Stick to water sprays or insecticidal soaps.
- Will aphids kill my plant?
- They rarely kill the plant outright, but they drain its energy and make it look unsightly. Early removal keeps the plant thriving.
Guides to these causes
More problems with floating sweet-grass
Back to the floating sweet-grass 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.