Pocket Botanist
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Check these first
- Inspect the tips of the stems for clusters of tiny bugs.
- Check the undersides of the leaves for sticky residue.
- Look for ants, which often farm aphids.
Likely causes
Aphid infestation
Most likelyHow to tell: You see small green or black insects clustered on the stems and new leaves. The leaves may also look sticky or distorted.
What to do: Spray the plant with a strong stream of water to knock them off. Apply insecticidal soap or neem oil to the affected areas every 5 to 7 days until they are gone.
Over-fertilization
PossibleHow to tell: Excessive soft growth attracts more aphids than usual.
What to do: Reduce your feeding schedule to once a month during the growing season. Use a balanced liquid fertilizer at half strength.
Find out what's wrong with your water pepper
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
A few aphids are manageable, but a heavy infestation can stunt growth and spread viruses. Act as soon as you see the first few bugs.
Stopping it coming back
Keep the plant healthy with proper light and water, and check the leaves weekly for early signs of pests.
Water pepper: pests? Check yours with a photo
Every plant is a little different. Take a photo of your water pepper 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 dish soap to kill them?
- A mild solution of water and a few drops of unscented dish soap can work, but insecticidal soap is safer for the plant.
- Will these bugs kill my plant?
- They can weaken it significantly if left unchecked. Regular cleaning and treatment will keep your plant safe.
Guides to these causes
More problems with Water pepper
Back to the Water pepper 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.