Should I cut off all the spotted leaves?

Yes, removing them helps prevent the fungus from spreading to healthy parts of the plant.

Can I use a fungicide?

Usually, it is not necessary for plantain. Improving airflow and keeping leaves dry is much more effective.

Why does my Broadleaf Plantain have brown spots?

Check these first

Inspect the undersides of the leaves for signs of pests.
Touch the soil to see if it feels waterlogged.
Check if the plant is crowded by other plants.

Likely causes

Fungal leaf spot
Most likely
How to tell: You will see distinct round, brown spots appearing on the leaves, often with a darker border.
What to do: Remove the affected leaves immediately to stop the spread. Improve air circulation around the plant and avoid overhead watering to keep the foliage dry.
Overwatering
Possible
How to tell: The soil stays soggy for long periods and the spots appear soft or mushy.
What to do: Let the top inch of soil dry out completely before watering again. Ensure your pot has drainage holes so excess water can escape.

When to worry

Worry if the spots are spreading rapidly across the entire plant. A few small spots on older leaves are usually not a major concern.

Stopping it coming back

Water at the base of the plant instead of over the leaves to keep them dry.

Not sure which one it is? Photograph your greater plantain.

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.

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Questions people ask

Should I cut off all the spotted leaves?: Yes, removing them helps prevent the fungus from spreading to healthy parts of the plant.
Can I use a fungicide?: Usually, it is not necessary for plantain. Improving airflow and keeping leaves dry is much more effective.