Pocket Botanist
Check these first
- Examine the leaves for a white, powdery texture.
- Look for dark spots with yellow rings.
- Check if the plant is crowded by other weeds or plants.
Likely causes
Powdery mildew
Most likelyHow to tell: You will see a white, floury coating on the leaf surface. It often starts as small patches and spreads quickly.
What to do: Remove the most heavily infected leaves to stop the spread. Improve airflow around the plant by thinning out nearby vegetation. Avoid overhead watering to keep the foliage dry.
Leaf spot disease
PossibleHow to tell: These appear as dark or brown spots with yellow halos. They are usually caused by fungal spores splashing from the soil.
What to do: Clean up any fallen leaves around the base of the plant. Apply a copper based fungicide if the spots continue to spread. Mulch the soil to prevent spores from splashing up during rain.
Find out what's wrong with your lesser burdock
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
It is serious if the leaves start to wither and die back rapidly. A few small spots are normal in late summer as the plant matures.
Stopping it coming back
Give your burdock plenty of space for air to circulate and water only at the base of the plant.
Lesser burdock: spots? Check yours with a photo
Every plant is a little different. Take a photo of your lesser burdock 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
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Questions people ask
- Will these spots kill my plant?
- Usually no, but they can weaken it. If the infection covers most of the leaves, the plant may struggle to produce seeds.
- Can I use a homemade spray?
- Yes, a mix of one tablespoon of baking soda in a gallon of water can help manage mild powdery mildew. Spray it on the leaves during a cool part of the day.
Guides to these causes
More problems with Lesser burdock
- Why is my Lesser burdock drooping?
- Why is my lesser burdock looking so leggy?
- Why are the tips of my Lesser burdock leaves turning brown?
- Why are my lesser burdock leaves turning yellow?
- What are these pests on my lesser burdock?
- Why is my lesser burdock showing signs of root rot?
- Why are my lesser burdock leaves curling?
Back to the Lesser burdock 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.