Pocket Botanist
Check these first
- Touch the spots to see if they feel soft or firm.
- Inspect the soil to ensure it is completely dry.
- Check if the plant was recently moved to a brighter location.
Likely causes
Fungal infection
PossibleHow to tell: You will see small, sunken, or discolored patches that may feel soft or mushy to the touch. These often appear after periods of high humidity or if the pads stay wet for too long.
What to do: Use a sterile knife to cut away the affected area, ensuring you remove all discolored tissue. Keep the cut dry for 7 to 10 days to allow it to callous over. Improve airflow around the plant by moving it to a spot with better ventilation.
Sunburn
PossibleHow to tell: These spots look like bleached, white, or tan patches that appear suddenly after moving the plant into intense light. Unlike fungal spots, these are dry and do not spread.
What to do: Move the plant to a location with slightly less intense afternoon sun for 2 to 3 weeks. Gradually reintroduce it to full sun once it recovers. Leave the scarred pads alone as they will not heal but will remain healthy.
Find out what's wrong with your beavertail cactus
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 or turning into mushy rot, as this can kill the pad. Small, dry, or corky scars are normal as the cactus ages.
Stopping it coming back
Keep the pads dry and ensure your cactus gets plenty of fresh air and direct sunlight. Avoid overhead watering to keep moisture off the surface of the pads.
Beavertail cactus: spots? Check yours with a photo
Every plant is a little different. Take a photo of your beavertail cactus 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
- Can I spray the spots with water?
- No, you should keep the pads dry. Spraying water can encourage fungal growth and make the spots worse.
- Will the spots go away?
- No, the spots are permanent scars. As the plant grows, new pads will emerge without these marks.
More problems with Beavertail cactus
Back to the Beavertail cactus 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.