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Check these first
- Examine the leaves for white, dusty patches.
- Check if the leaves stay wet for too long after watering.
- Ensure there is enough space between plants for air to move.
Likely causes
Powdery Mildew
Most likelyHow to tell: You will see a white, dusty fungal growth on the surface of the leaves that can be wiped off.
What to do: Improve air circulation by spacing plants further apart or using a small fan. Treat the plant with a mixture of one part milk to nine parts water or a neem oil spray.
Fungal Leaf Spot
PossibleHow to tell: Small brown or black spots appear on the leaves, often with a yellow halo around them.
What to do: Remove the affected leaves immediately to stop the spread. Avoid overhead watering to keep the foliage dry.
Find out what's wrong with your american germander
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
Small spots are manageable, but if they cover more than half of the foliage, the plant will struggle to photosynthesize. Take action as soon as you see the first signs.
Stopping it coming back
Water at the base of the plant rather than over the leaves to keep the foliage dry.
American germander: spots? Check yours with a photo
Every plant is a little different. Take a photo of your american germander 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
- Is powdery mildew contagious?
- Yes, the spores can easily spread to other plants nearby through air currents.
- Should I throw the plant away if it has spots?
- Usually, you can save it by pruning the infected parts and improving the environment, so there is no need to discard it.
Guides to these causes
More problems with American germander
- Why is my American germander looking so leggy?
- Why is my American germander drooping?
- Why does my American germander have root rot?
- Why are my American germander leaves turning yellow?
- Why are my American germander's leaf tips turning brown?
- Why is my American germander dropping leaves?
- Why won't my American germander bloom?
- What are these bugs on my American germander?
- Why are my American germander leaves curling?
Back to the American germander 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.