Can I save a tree with root rot?

If caught early, you can save it by improving drainage and reducing water. If the rot has reached the trunk, the tree is likely beyond help.

How often should I water to prevent rot?

Water every 7 to 14 days, but always check the soil first. If it is still damp, skip the watering until it dries out slightly.

How do I know if my Western Red Cedar has root rot?

Check these first

Smell the soil near the base for a foul, rotten odor.
Check if the ground around the tree stays muddy for days after rain.
Look for yellowing needles that start from the bottom of the tree.

Likely causes

Poor drainage
Most likely
How to tell: The needles turn yellow or brown, and the tree may appear to wilt even when the soil is wet. The base of the trunk might feel soft or spongy.
What to do: Improve soil drainage by amending the surrounding area with organic matter or installing a drainage pipe. Avoid watering until the top 2 inches of soil are dry.
Overwatering
Possible
How to tell: The tree shows signs of decline despite regular care. The soil remains perpetually wet and may emit a sour or musty smell.
What to do: Adjust your watering schedule to every 10 to 14 days depending on rainfall. Ensure the root zone is damp but never waterlogged.

When to worry

Root rot is often fatal if the root system is already severely decayed. If the trunk base is soft and the foliage is mostly brown, the tree may not recover.

Stopping it coming back

Plant your cedar in well-draining soil and avoid over-mulching against the trunk, which traps excess moisture.

Not sure which one it is? Photograph your western red cedar.

This page lists the usual causes. Pocket Botanist looks at your actual leaf 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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Questions people ask

Can I save a tree with root rot?: If caught early, you can save it by improving drainage and reducing water. If the rot has reached the trunk, the tree is likely beyond help.
How often should I water to prevent rot?: Water every 7 to 14 days, but always check the soil first. If it is still damp, skip the watering until it dries out slightly.