Pocket Botanist
Check these first
- Examine the leaves for circular dark spots.
- Check if the plant is crowded by other shrubs.
- Look for signs of moisture trapped in the center of the plant.
Likely causes
Leaf spot fungus
Most likelyHow to tell: Small, dark, or circular spots appear on the leaves, sometimes with a yellow halo.
What to do: Remove and destroy all infected leaves to prevent the fungus from spreading. Improve air circulation by thinning out crowded branches and avoid overhead watering.
Poor air circulation
PossibleHow to tell: The center of the shrub is very dense and stays wet long after rain.
What to do: Prune the interior of the shrub to allow wind to pass through the branches. This helps the foliage dry out faster after rain.
When to worry
A few spots are normal in a wet season, but if the entire plant is defoliating, you should take action to stop the spread.
Stopping it coming back
Water at the base of the plant rather than over the leaves to keep the foliage dry.
Not sure which one it is? Photograph your weeping forsythia.
This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
Questions people ask
- Should I use a fungicide?
- Fungicides are rarely necessary for Weeping forsythia. Good sanitation and pruning usually solve the problem.
- Will the spots kill my plant?
- Usually not, but it can weaken the shrub over time. Keep the area clean of fallen leaves to prevent reinfection next year.
More problems with Weeping forsythia
Back to the Weeping forsythia 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.