Can I use a fungicide to treat root rot?

Fungicides are generally ineffective for root rot because they cannot reach the damaged roots deep in the soil. The best approach is to fix the drainage and moisture issues.

How long does it take for a tree to recover from root rot?

Recovery is a slow process that can take a full growing season or more. You will need to be patient and keep the tree's environment stable.

How do I fix root rot in my Star magnolia? Causes and fixes

Check these first

Observe if water pools around the trunk after a heavy rain.
Dig a small hole near the drip line to check if the soil is waterlogged.
Smell the soil for a musty or rotten odor.

Likely causes

Poor soil drainage
Most likely
How to tell: The leaves may turn yellow or wilt even when the soil feels wet. The roots will look mushy, dark, or smell sour if you dig down to inspect them.
What to do: Improve the soil drainage by amending the surrounding area with organic compost. If the tree is in a low spot, consider transplanting it to a slightly elevated mound.
Overwatering
Possible
How to tell: The soil stays constantly soggy and never has a chance to dry out slightly between waterings. The tree will show signs of decline, such as thinning foliage and weak growth.
What to do: Adjust your watering schedule to allow the top 2 inches of soil to dry out before adding more water. Ensure you are watering deeply but less frequently rather than giving small daily drinks.

Root rot in other plants

Find out what's wrong with your star magnolia

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 a serious condition that can kill the tree if the root system is mostly decayed. If the entire canopy is wilting and the bark at the base feels soft, the damage may be too far gone.

Stopping it coming back

Plant your magnolia in well draining soil and avoid burying the root flare too deep when you first put it in the ground.

Star magnolia: root rot? Check yours with a photo

Every plant is a little different. Take a photo of your star magnolia 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 use a fungicide to treat root rot?: Fungicides are generally ineffective for root rot because they cannot reach the damaged roots deep in the soil. The best approach is to fix the drainage and moisture issues.
How long does it take for a tree to recover from root rot?: Recovery is a slow process that can take a full growing season or more. You will need to be patient and keep the tree's environment stable.

How do I fix root rot in my Star magnolia?