Pocket BotanistCheck these first
- Inspect the stems for dark lesions or streaks.
- Look for small blisters or puffy areas on the leaves.
- Check the soil moisture to ensure it is not bone dry.
Likely causes
Boxwood blight
Most likelyHow to tell: You will notice rapid leaf drop accompanied by dark brown or black lesions on the stems. The leaves often turn tan or brown before falling off entirely.
What to do: Prune out all infected branches immediately, making sure to sterilize your shears with alcohol between every cut. Bag and dispose of the clippings in the trash, never in your compost pile. Apply a fungicide labeled for boxwood blight to protect the remaining healthy foliage.
Boxwood leafminer
Most likelyHow to tell: The leaves will show yellow or orange blotches and may feel slightly puffy or blistered. Eventually, the damaged leaves drop prematurely.
What to do: Apply a systemic insecticide containing imidacloprid to the soil in early spring before the adult flies emerge. This helps kill the larvae feeding inside the leaf tissue. Keep the plant well watered to help it recover from the stress.
Find out what's wrong with your littleleaf boxwood
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
If you see rapid defoliation across the entire shrub, it is likely a serious infection that requires immediate intervention. A few leaves dropping from the inner canopy during late summer is normal as the plant sheds older growth.
Stopping it coming back
Ensure good air circulation by spacing your plants properly and avoiding overhead watering. Keep the area around the base of the plant free of fallen debris.
Keep your littleleaf boxwood 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 boxwood recover from leaf drop?
- Yes, if the cause is caught early and the root system remains healthy. It may take a full growing season for the plant to fill back in.
- Should I fertilize a boxwood that is losing leaves?
- No, avoid fertilizing a stressed plant. Wait until you have identified and treated the underlying cause before adding any nutrients.
More problems with Littleleaf boxwood
- Why are my Japanese Boxwood leaves turning yellow?
- How do I identify pests on my Japanese Boxwood?
- Why do my Japanese Boxwood leaves have brown tips?
- Why is my littleleaf boxwood drooping?
- What are these spots on my boxwood leaves?
- Why is my Littleleaf boxwood showing signs of root rot?
- Why is my Littleleaf boxwood looking leggy?
- Why are my Littleleaf boxwood leaves curling?
Back to the Littleleaf boxwood guide
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.