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smallflower hairy willowherb · Epilobium parviflorum

Why does my smallflower hairy willowherb have spots?

Smallflower hairy willowherb is prone to rust fungus when conditions get too humid or stagnant. Check your plant for orange or brown powdery spots on the undersides of the leaves first.

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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. Check if the leaves are staying wet for long periods.
  3. Look for signs of poor airflow around the plant.

Likely causes

  1. Rust fungus

    Most likely

    How to tell: You will see small orange or reddish brown pustules on the leaf surfaces. These often appear when the air is damp and not moving.

    What to do: Remove and destroy all infected leaves immediately to stop the spread. Improve air circulation by spacing plants further apart or using a small fan. Avoid overhead watering to keep the foliage dry.

  2. Leaf spot disease

    Possible

    How to tell: These spots are usually darker, often brown or black, and may have a yellow halo. They occur when water sits on the leaves for too long.

    What to do: Prune away damaged foliage to reduce the fungal load. Water only at the base of the plant to keep leaves dry. Apply a copper based fungicide if the infection persists.

Leaf spots on other plants

Find out what's wrong with your smallflower hairy willowherb

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

Worry if the spots are spreading rapidly to new growth. A few isolated spots on older leaves are common in humid weather.

Stopping it coming back

Ensure good spacing between plants and always water the soil rather than the leaves.

Smallflower hairy willowherb: spots? Check yours with a photo

Every plant is a little different. Take a photo of your smallflower hairy willowherb 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 save a leaf with rust spots?
It is best to remove it. Rust spreads through spores that travel easily to healthy parts of the plant.
Will these spots kill my plant?
If left untreated, severe infections can weaken the plant significantly. Early removal usually keeps the plant healthy.

Guides to these causes

More problems with smallflower hairy willowherb

Back to the smallflower hairy willowherb 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.