Is this fungus dangerous to my other plants?

It can be, so it is best to isolate the affected sedge until the spots are gone. Clean your tools after trimming infected leaves.

Should I use a fungicide?

Usually, improving airflow and removing infected leaves is enough. Only use a fungicide if the infection is severe and persistent.

Shallow sedge: spots, causes and fixes

Check these first

Inspect the undersides of the leaves for signs of fungal spores.
Check if the plant is crowded by other plants.
Ensure the leaves are not staying wet for long periods.

Likely causes

Rust Fungus
Most likely
How to tell: Small orange or brown spots appear on the leaves during humid weather. These spots are a common fungal infection for this species.
What to do: Remove the affected leaves to stop the fungus from spreading. Improve air circulation by moving the plant to a spot with a gentle breeze.
Water Splashing
Possible
How to tell: Small irregular spots appear after you water the plant. This happens when soil or water splashes onto the leaves and stays there.
What to do: Water the soil directly at the base of the plant rather than pouring water over the foliage. Wipe any water off the leaves if they get wet during watering.

Leaf spots on other plants

Find out what's wrong with your shallow sedge

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

A few spots are manageable, but if they cover the entire leaf surface, the plant may struggle to photosynthesize. Take action immediately if you see the spots spreading.

Stopping it coming back

Keep the foliage dry and ensure there is good airflow around your sedge.

Shallow sedge: spots? Check yours with a photo

Every plant is a little different. Take a photo of your shallow sedge 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

Is this fungus dangerous to my other plants?: It can be, so it is best to isolate the affected sedge until the spots are gone. Clean your tools after trimming infected leaves.
Should I use a fungicide?: Usually, improving airflow and removing infected leaves is enough. Only use a fungicide if the infection is severe and persistent.

Guides to these causes

Rust

Why are there spots on my shallow sedge leaves?

Check these first

Not sure what's wrong with your shallow sedge?