Pocket Botanist
Check these first
- Look for a white, dusty coating on the leaves.
- Check if the plants are crowded together.
- Observe if the spots are brown or white.
Likely causes
Powdery Mildew
Most likelyHow to tell: White, powdery patches appear on the surface of the leaves during humid weather.
What to do: Improve air circulation by thinning out crowded plants. You can spray the foliage with a mixture of one tablespoon of baking soda in a gallon of water.
Leaf Spot Disease
PossibleHow to tell: Dark or brown spots with yellow halos appear on the foliage.
What to do: Remove and dispose of any infected leaves to stop the spread. Avoid overhead watering to keep the foliage dry.
Find out what's wrong with your bigroot 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.
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When to worry
Powdery mildew is rarely fatal but can look unsightly. Treat it early to prevent it from covering the entire plant.
Stopping it coming back
Give your plants enough space for air to move between them and water at the base instead of over the leaves.
Bigroot Geranium: spots? Check yours with a photo
Every plant is a little different. Take a photo of your bigroot 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
- Will these spots kill my plant?
- Usually no. Bigroot Geranium is quite tough and will likely recover once the weather becomes less humid.
- Can I wash the spots off?
- You can wipe them off, but the fungus will return if the conditions remain humid and stagnant.
Guides to these causes
More problems with Bigroot Geranium
Back to the Bigroot Geranium 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.