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Blue sedge · Carex flacca

What are these spots on my Blue sedge leaves?

Spots on Blue sedge are often a sign of fungal rust, which thrives in damp, stagnant air. Check the foliage for orange or dark brown patches to confirm this.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Examine the undersides of the leaves for fungal growth.
  2. Check if the plant has enough space for air to circulate.
  3. Look for signs of excessive moisture on the leaves.

Likely causes

  1. Fungal Rust

    Most likely

    How to tell: Small orange or brown spots appear on the leaves, often accompanied by a powdery texture.

    What to do: Remove the affected leaves immediately to stop the spread. Improve airflow around the plant by spacing it further from other greenery.

  2. Overhead Watering

    Possible

    How to tell: Spots appear after you have watered the plant from above, wetting the leaves.

    What to do: Water at the base of the plant rather than over the foliage. Ensure the leaves stay dry during your watering routine.

Leaf spots on other plants

Find out what's wrong with your blue 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.

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When to worry

If the spots are spreading quickly or covering most of the plant, take action immediately. A few isolated spots are usually manageable.

Stopping it coming back

Keep the foliage dry and ensure good ventilation in the area where your plant sits.

Blue sedge: spots? Check yours with a photo

Every plant is a little different. Take a photo of your blue 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.

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Questions people ask

Can I use a fungicide?
You can use a copper based fungicide if the rust is severe. Follow the label instructions carefully for the best results.
Is this contagious to other plants?
Yes, fungal spores can spread through the air to nearby plants. Isolate your Blue sedge until the spots are gone.

Guides to these causes

More problems with Blue sedge

Back to the Blue sedge guide

This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.