Pocket Botanist
Check these first
- Dig down 4 inches near the root ball to feel the soil moisture.
- Inspect the roots for a mushy texture or dark color.
- Check if the tree is planted in a low area that holds water.
Likely causes
Phytophthora root rot
Most likelyHow to tell: The foliage turns dull, then brown, and the tree loses vigor quickly. The roots will look dark, mushy, or brittle instead of firm and white.
What to do: Improve drainage by amending the soil with organic matter or installing a drainage pipe. If the infection is widespread, the tree may need to be removed to prevent spread to nearby plants.
Poor drainage
PossibleHow to tell: The soil stays soggy for days after watering. You might notice a sour smell coming from the mulch or soil surface.
What to do: Stop watering immediately and let the top 3 inches of soil dry out. Avoid planting in low spots where water collects after rain.
Find out what's wrong with your hinoki cypress
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 entire tree is turning brown or the roots are completely rotted, it is likely too late to save it. Some minor browning on the interior is normal as the tree ages.
Stopping it coming back
Plant your Hinoki cypress in well draining soil and avoid overwatering by checking the soil moisture every 5 to 10 days.
Hinoki cypress: root rot? Check yours with a photo
Every plant is a little different. Take a photo of your hinoki cypress 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 tree with root rot?
- If caught early, you can improve drainage and reduce watering to help the tree recover. If the root system is severely damaged, the tree will not recover.
- How often should I water to avoid rot?
- Water every 5 to 10 days depending on the weather. Always check that the top inch of soil is dry before adding more water.
Guides to these causes
More problems with Hinoki cypress
Back to the Hinoki cypress 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.