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Spotted bee balm · Monarda punctata

Why does my Spotted bee balm have spots on its leaves?

Spotted bee balm is prone to fungal issues when conditions get humid or air circulation is poor. You will usually see these spots on the undersides of the leaves first. Check your plant closely to see if the spots are orange or white.

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spots on a plant
Photo: Scot Nelson, CC0

Check these first

  1. Inspect the undersides of the leaves for orange dust.
  2. Look for a white powdery film on the top of the foliage.
  3. Check if the plant is crowded by other garden neighbors.

Likely causes

  1. Rust

    Most likely

    How to tell: Small orange or reddish pustules appear on the undersides of leaves.

    What to do: Remove and destroy the infected leaves immediately to stop the spread. Improve airflow by thinning out crowded stems and avoid overhead watering.

  2. Powdery Mildew

    Most likely

    How to tell: A white, dusty coating covers the leaves and stems.

    What to do: Prune away heavily affected foliage to increase air movement. Apply a neem oil spray or a mixture of water and baking soda to the leaves in the early morning.

Leaf spots on other plants

Find out what's wrong with your spotted bee balm

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 cover more than half the foliage, the plant will struggle to photosynthesize. Small, isolated spots are manageable with quick pruning.

Stopping it coming back

Ensure your bee balm has plenty of space for air to move between plants and water only at the base.

Spotted bee balm: spots? Check yours with a photo

Every plant is a little different. Take a photo of your spotted bee balm 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

Will these spots kill my plant?
Usually no, but they weaken it significantly. If left untreated, the plant may lose its vigor and stop blooming.
Should I use a fungicide?
You can use a copper based fungicide if the infection is severe. However, cultural changes like better spacing are more effective long term.

Guides to these causes

More problems with Spotted bee balm

Back to the Spotted bee balm 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.