Pocket BotanistCheck these first
- Inspect the leaves for dark brown spots or black streaks on the stems.
- Stick your finger 2 inches into the soil to check for sogginess.
- Look for signs of pests like scale or mites on the undersides of leaves.
Likely causes
Box Blight
Most likelyHow to tell: You will see dark brown spots on the leaves followed by rapid leaf drop and black streaks on the stems. It often starts in the center of the plant where airflow is poor.
What to do: Prune out all affected branches immediately, cutting back to healthy wood. Sterilize your pruners with alcohol between every cut to stop the spread. Dispose of the clippings in the trash, not your compost pile.
Overwatering
Most likelyHow to tell: The leaves turn yellow or brown before falling off, and the soil feels constantly soggy. The roots may smell sour if you check them.
What to do: Stop watering until the top 2 inches of soil feel dry to the touch. Ensure your pot has drainage holes so water can escape freely. If the soil is heavy, repot the plant into a mix with more perlite for better aeration.
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
It is normal for a few old leaves to drop in late spring as new growth emerges. You should worry if the leaf drop is sudden or if you see dark spots on the foliage.
Stopping it coming back
Keep the foliage dry by watering at the base of the plant rather than overhead. Provide plenty of space between plants to ensure good airflow.
Keep your sweet box healthy from here
Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.
Questions people ask
- Can my Sweet Box recover from box blight?
- Yes, if you catch it early and prune out all infected parts. Keep the plant dry and improve airflow to prevent it from coming back.
- Is it normal for my plant to lose leaves in winter?
- Sweet Box is evergreen, so it should keep its leaves year round. If it is losing leaves in winter, it is likely too wet or suffering from cold wind exposure.
More problems with Sweet box
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.