Pocket Botanist
Check these first
- Rub a spot with your finger to see if it leaves a powdery residue.
- Inspect the undersides of the leaves for signs of fungal growth.
- Check if the plant has been sitting in stagnant, humid air.
Likely causes
Rust fungus
Most likelyHow to tell: You will see small orange or brown pustules that rub off as a dusty powder on your fingers. It often appears after periods of high humidity or damp weather.
What to do: Remove and destroy the infected leaves immediately to stop the spores from spreading. Avoid overhead watering to keep the foliage dry, and ensure your plant has plenty of airflow.
Leaf spot disease
PossibleHow to tell: These spots are usually darker, sunken, or have a yellow halo around them. They do not rub off like rust spores.
What to do: Prune away the damaged foliage to prevent further spread. Keep the area around the base of the plant clear of old debris where fungi can hide.
Find out what's wrong with your wall barley
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 leaf surface or start spreading to neighboring plants, it is time to act fast. A few small spots are manageable, but widespread infection can weaken the plant.
Stopping it coming back
Provide excellent air circulation and always water at the base of the plant rather than over the leaves.
Wall barley: spots? Check yours with a photo
Every plant is a little different. Take a photo of your wall barley 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 that has rust?
- It is usually best to remove it. Once the fungus has produced spores, the leaf is unlikely to recover and will only spread the infection.
- Will these spots kill my wall barley?
- If left untreated, severe rust can stunt growth and weaken the plant significantly. Early removal of infected parts usually keeps the plant healthy.
Guides to these causes
More problems with wall barley
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.