Pocket Botanist
Check these first
- Feel the soil depth to see if it is soggy.
- Check if the pot has adequate drainage holes.
- Smell the soil for a sour or rotten odor.
Likely causes
Poor drainage
Most likelyHow to tell: The plant looks wilted even when the soil is damp, and the base of the stem feels soft or mushy. The leaves may turn yellow or black.
What to do: Improve the soil drainage by mixing in coarse sand or grit. If the plant is in a pot, ensure it has large drainage holes and is not sitting in a saucer of water.
Overwatering
PossibleHow to tell: The soil remains soggy for more than two weeks after watering. The roots will look dark and slimy instead of firm and white.
What to do: Wait until the top 3 inches of soil are completely dry before watering again. Reduce your watering frequency during the cooler, wetter months.
Find out what's wrong with your saw banksia
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 stem base is soft and the plant is collapsing, it may be too late to save. If only a few roots are affected, you have a good chance of recovery.
Stopping it coming back
Use a fast draining potting mix designed for native plants and never let the plant sit in standing water.
Saw Banksia: root rot? Check yours with a photo
Every plant is a little different. Take a photo of your saw banksia 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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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 repot a plant with root rot?
- Yes, carefully remove the plant, trim away any black or mushy roots, and repot it into fresh, well draining soil.
- How often should I water to prevent this?
- Water every 7 to 14 days, but always check the soil dryness first rather than sticking to a strict calendar.
More problems with Saw Banksia
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.