Can I use a fungicide on my water plantain?

Avoid using chemical fungicides as they can harm fish and other pond life. It is better to remove the damaged leaves and improve water quality.

Are these spots contagious to other plants?

If the spots are caused by a fungus, they can spread through the water. It is best to isolate the plant or remove the infected parts quickly.

Common water plantain: spots, causes and fixes

Check these first

Examine the water for signs of decay or algae buildup.
Look at the underside of the leaves for insects.
Check if the water is stagnant.

Likely causes

Fungal infection
Possible
How to tell: Small, dark, or circular spots appear on the leaves, sometimes with a yellow halo.
What to do: Remove the affected leaves to stop the spread. Ensure there is some water movement or aeration in your pond to prevent stagnant conditions.
Nutrient deficiency
Possible
How to tell: Leaves develop pale or discolored spots that look like a mosaic pattern.
What to do: Add an aquatic plant fertilizer tablet into the soil once in the spring. Follow the package instructions for the size of your container.

Leaf spots on other plants

Find out what's wrong with your common water plantain

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.

When to worry

Worry if the spots cover more than half of the leaf surface or start appearing on new growth. Minor spotting on older leaves is generally harmless.

Stopping it coming back

Keep the water clean and encourage slight movement or aeration in your pond or container.

Common water plantain: spots? Check yours with a photo

Every plant is a little different. Take a photo of your common water plantain and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

Get the app · Or check it from a photo now, free

Questions people ask

Can I use a fungicide on my water plantain?: Avoid using chemical fungicides as they can harm fish and other pond life. It is better to remove the damaged leaves and improve water quality.
Are these spots contagious to other plants?: If the spots are caused by a fungus, they can spread through the water. It is best to isolate the plant or remove the infected parts quickly.

Why are there spots on my water plantain leaves?