Pocket BotanistCheck these first
- Look at the leaves to see if the spots are spreading.
- Check if the plant is crowded by other vegetation.
- Observe how you water the plant.
Likely causes
Fungal Leaf Spot
Most likelyHow to tell: Small brown or black spots appear on the leaves, sometimes with a yellow halo.
What to do: Remove and destroy any infected leaves to stop the spread. Improve air circulation by thinning out crowded branches.
Overhead Watering
PossibleHow to tell: The spots appear shortly after you water the plant from above, wetting the leaves.
What to do: Water at the base of the plant instead of spraying the foliage. Keeping the leaves dry prevents fungal spores from germinating.
When to worry
Leaf spot is usually cosmetic and rarely kills the plant. It is only a major concern if the infection causes massive leaf drop.
Stopping it coming back
Water at the soil level and prune the vine to allow air to flow freely through the branches.
Not sure which one it is? Photograph your wisteria.
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 cut off all the spotted leaves?
- Yes, removing infected leaves helps reduce the amount of fungus present. Just be sure to dispose of them in the trash, not your compost.
- Will the spots go away?
- The existing spots will not disappear, but new growth should be healthy if you improve air circulation and keep leaves dry.
More problems with Wisteria
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.