Pocket Botanist
Check these first
- Examine the spots to see if they are fuzzy or dry.
- Check if the plant is crowded by other vegetation.
- Look for fallen leaves at the base of the plant.
Likely causes
Leaf Spot Fungus
Most likelyHow to tell: You will see dark, irregular spots on the leaves that may have a lighter center. These spots often appear after long periods of rain or high humidity.
What to do: Prune away the most heavily affected branches to improve airflow. Clean up and dispose of any fallen leaves around the base to prevent the fungus from spreading.
Poor Air Circulation
PossibleHow to tell: The plant is crowded by other shrubs or against a wall where air cannot move freely. This keeps the leaves wet for too long after rain.
What to do: Trim back surrounding plants to create space. If the Sweet box is against a wall, ensure there is at least 6 to 12 inches of space for air to move behind it.
Find out what's wrong with your sweet box
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, occasional spots are common in wet springs. You should worry if the spots are causing significant leaf drop or covering more than half of the foliage.
Stopping it coming back
Water at the base of the plant rather than overhead to keep the leaves dry. Ensure the plant has enough space to breathe.
Sweet box: spots? Check yours with a photo
Every plant is a little different. Take a photo of your sweet box 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
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Questions people ask
- Will these spots kill my plant?
- Usually no, but they can make the plant look unsightly. Proper care and cleanup will help it recover.
- Should I use a fungicide?
- It is rarely necessary for Sweet box. Improving airflow and removing infected leaves is almost always enough.
Guides to these causes
More problems with Sweet box
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.