Pocket Botanist
Check these first
- Check the soil moisture at a depth of 4 inches.
- Inspect the area around the trunk for standing water.
- Look for signs of fungal growth or mushrooms near the base.
Likely causes
Poor Soil Drainage
Most likelyHow to tell: The soil around the base stays soggy for days after watering or rain. You might notice a sour or swampy smell coming from the ground.
What to do: Improve drainage by amending the surrounding soil with organic matter or installing a French drain. Avoid adding mulch directly against the trunk, as this traps excess moisture.
Overwatering
PossibleHow to tell: The tree is being watered too frequently, preventing the roots from getting oxygen. Leaves may yellow or wilt despite the soil being wet.
What to do: Adjust your watering schedule to every 14 days rather than every 7 days. Ensure the soil has time to dry out slightly in the top 2 to 3 inches before adding more water.
Find out what's wrong with your green ash
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 tree shows significant canopy thinning or branch dieback, the root system is likely severely compromised. This is a serious condition that often requires professional arborist intervention.
Stopping it coming back
Plant your Green Ash in well draining soil and ensure the root flare is visible at the surface. Avoid overwatering once the tree is established.
Green Ash: root rot? Check yours with a photo
Every plant is a little different. Take a photo of your green ash 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 a Green Ash recover from root rot?
- If caught early, improving drainage and adjusting your watering habits can help the tree recover. If the damage is extensive, the tree may not survive.
- Does mulch cause root rot?
- Mulch is beneficial, but piling it against the trunk creates a moist environment that encourages rot. Keep mulch a few inches away from the tree bark.
More problems with Green Ash
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.