Check these first
- Gently pull the plant from its pot to inspect the roots.
- Smell the soil for a sour or rotten odor.
- Check that your pot has large drainage holes.
Likely causes
Poor Drainage
Most likelyHow to tell: The soil stays wet for weeks and the plant base feels soft or squishy.
What to do: Remove the plant from the pot and trim away any black or mushy roots. Replant in a gritty, inorganic soil mix that drains instantly.
Excessive Watering
Most likelyHow to tell: The plant shows signs of decline despite being in a sunny spot.
What to do: Wait until the soil is completely bone dry before adding any water. In winter, skip watering entirely.
Find out what's wrong with your boojum tree
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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
If the trunk itself feels soft or hollow, the rot may have already traveled too far to save the plant. Healthy plants should feel firm and woody.
Stopping it coming back
Use a specialized cactus and succulent soil mix with plenty of pumice or perlite. Always ensure the pot has excellent drainage.
Boojum tree: root rot? Check yours with a photo
Every plant is a little different. Take a photo of your boojum tree 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
Get the app · Or check it from a photo now, free
Questions people ask
- Can I save a plant with mushy roots?
- If you catch it early, you can trim the bad roots and let the plant dry out before repotting. If the rot has reached the main stem, it is usually fatal.
- How often should I water to avoid this?
- Water every 14 to 30 days during the growing season, but only when the soil is completely dry.
More problems with Boojum tree
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.

