Check these first
- Examine the undersides of the leaves closely.
- Check the flower buds for sticky residue.
- Look for fuzzy gray patches on the foliage.
Likely causes
Aphids
Most likelyHow to tell: Small green or black insects clustered on the undersides of leaves or on flower buds.
What to do: Spray the plant with a strong stream of water to knock them off. For persistent infestations, apply insecticidal soap or neem oil once a week.
Botrytis
PossibleHow to tell: Gray fuzzy mold appearing on leaves or flowers, often caused by high humidity.
What to do: Remove all affected parts of the plant immediately to stop the spread. Improve air circulation around the plant and avoid getting water on the leaves.
Find out what's wrong with your geranium
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
Small numbers of aphids are manageable, but a heavy infestation can drain the plant of energy. Botrytis is serious and requires immediate cleanup to save the plant.
Stopping it coming back
Keep your plant in a well ventilated area and inspect it every time you water.
Geranium: pests? Check yours with a photo
Every plant is a little different. Take a photo of your geranium 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
- Are these bugs harmful to me?
- No, aphids are harmless to humans and pets, though they can damage your plant.
- Can I use household soap to kill aphids?
- Use only mild, non detergent soap diluted in water, as harsh chemicals can burn the leaves.
Guides to these causes
More problems with Geranium
- Why are my geranium's leaves turning yellow?
- Why is my geranium growing so leggy?
- Why is my geranium drooping?
- Why are there spots on my geranium leaves?
- Why is my geranium not blooming?
- Why is my geranium's stem turning black and mushy?
- Why are my geranium's leaf tips turning brown?
- Why is my geranium losing its leaves?
- Why are my geranium leaves curling?
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.

