Pocket Botanist
Check these first
- Check if the spots are fuzzy or gray.
- Observe if the spots appear after a period of heavy rain.
- Ensure the plant has enough space between neighbors for air to circulate.
Likely causes
Botrytis blight
Most likelyHow to tell: You will see small, water soaked brown spots that eventually grow and turn gray or fuzzy.
What to do: Remove and destroy all infected leaves immediately to stop the spread. Improve airflow around the plant and avoid overhead watering to keep the foliage dry.
Leaf spot fungus
PossibleHow to tell: These appear as distinct, circular spots with a dark border on the leaves.
What to do: Apply a copper based fungicide according to the label instructions. Ensure you water only at the base of the plant to keep the leaves dry.
When to worry
Worry if the spots are spreading rapidly across the entire plant. Small, isolated spots are usually easy to manage with pruning.
Stopping it coming back
Water only at the soil level rather than over the leaves. Space your bulbs at least 6 inches apart to ensure good air movement.
Not sure which one it is? Photograph your eastern gladiolus.
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 the spotted leaves?
- Yes, removing infected leaves helps prevent the fungus from spreading to the rest of the plant.
- Is this disease contagious to other plants?
- Yes, fungal spores can travel through the air or water, so keep your other garden plants healthy and spaced out.
More problems with Eastern gladiolus
Back to the Eastern gladiolus 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.