Can I save a tree with root rot?

If you catch it early, yes. Improve the drainage and reduce watering to let the roots breathe again.

Why does my alder get root rot if it likes water?

Even water loving plants need oxygen in the soil. If the soil is completely saturated, the roots cannot breathe and will begin to decay.

Is my Common Alder suffering from root rot? Causes and fixes

Check these first

Check the soil moisture level at the base of the tree.
Smell the soil for a sour or rotten odor.
Look for signs of standing water around the roots.

Likely causes

Waterlogged Soil
Most likely
How to tell: The leaves may look wilted even when the soil is wet. The roots will appear dark, mushy, and smell bad if you dig down to check.
What to do: Improve the drainage of the planting site by adding organic matter or creating a slight mound. Stop watering until the top few inches of soil feel slightly less saturated. If the tree is in a container, ensure it has drainage holes.
Fungal Pathogens
Possible
How to tell: The tree shows a sudden decline in vigor and yellowing leaves. This often happens after a period of extreme saturation.
What to do: Remove any mulch touching the trunk to allow the soil surface to dry out. Avoid overwatering and ensure the tree is not sitting in a pool of standing water. If the tree is small, you might need to transplant it to a better draining spot.

Root rot in other plants

Find out what's wrong with your common alder

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.

When to worry

Root rot is serious and can be fatal if not addressed quickly. If the tree is losing large branches or the trunk feels soft, it may be too late.

Stopping it coming back

Plant your alder in soil that drains well, even though it likes moisture. Avoid piling mulch directly against the trunk.

Common Alder: root rot? Check yours with a photo

Every plant is a little different. Take a photo of your common alder 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.

Get the app · Or check it from a photo now, free

Questions people ask

Can I save a tree with root rot?: If you catch it early, yes. Improve the drainage and reduce watering to let the roots breathe again.
Why does my alder get root rot if it likes water?: Even water loving plants need oxygen in the soil. If the soil is completely saturated, the roots cannot breathe and will begin to decay.

Is my Common Alder suffering from root rot?