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Common polypody · Polypodium vulgare

Why are there spots on my common polypody?

It is less common for this fern to develop spots, which usually points to fungal issues or improper watering rather than pests. Check the underside of your fronds first to rule out scale insects.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the undersides of the fronds for tiny bumps.
  2. Check if the soil is staying soggy for more than a week.
  3. Look for signs of poor airflow around the plant.

Likely causes

  1. Fungal leaf spot

    Possible

    How to tell: You will see small brown or black circles with yellow halos on the fronds. This happens when the foliage stays wet for too long in stagnant air.

    What to do: Remove the affected fronds immediately to stop the spread. Improve air circulation around the plant and avoid misting the leaves directly.

  2. Scale insects

    Possible

    How to tell: These appear as tiny, hard brown bumps on the undersides of the fronds that do not move. They suck sap and leave behind sticky residue.

    What to do: Gently scrape the bumps off with a cotton swab dipped in rubbing alcohol. Repeat this process weekly until you no longer see any insects.

Leaf spots on other plants

Find out what's wrong with your common polypody

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 rapidly across multiple fronds, you need to act quickly. A single spot on an old, dying frond is usually nothing to worry about.

Stopping it coming back

Keep the foliage dry and ensure your fern has plenty of fresh air moving around it.

Common polypody: spots? Check yours with a photo

Every plant is a little different. Take a photo of your common polypody 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

Should I cut off all the spotted fronds?
Yes, it is best to trim them off at the base to prevent the fungus from moving to healthy parts of the plant. Use clean, sharp scissors.
Can I use neem oil on my fern?
Be very careful with neem oil as ferns are sensitive to it. It is safer to use the alcohol swab method for scale.

Guides to these causes

More problems with Common polypody

Back to the Common polypody 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.