Pocket BotanistCheck these first
- Check the soil moisture at a depth of 4 inches.
- Examine the fallen leaves for spots or signs of pests.
- Look at the remaining leaves to see if they are wilting or brittle.
Likely causes
Severe drought
PossibleHow to tell: The tree sheds leaves to reduce water loss during an extended dry spell. You will notice the soil is cracked and very dry.
What to do: Give the tree a deep, slow watering to saturate the root zone. Apply a thick layer of mulch to help the soil retain moisture for the next 14 days.
Root rot
PossibleHow to tell: Leaves drop suddenly while the soil remains wet and heavy. The roots may smell sour or look mushy if you dig down slightly.
What to do: Stop watering immediately and improve the drainage in the area. If the soil is heavy clay, you may need to divert water away from the base of the tree.
Find out what's wrong with your smooth sumac
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
Leaf drop is perfectly normal in the fall as the tree turns brilliant red and goes to sleep. If it happens in June or July, it is a serious concern.
Stopping it coming back
Maintain a consistent watering schedule during the first year of growth. Avoid overwatering once the tree is established, as it prefers to dry out between waterings.
Smooth sumac: leaf drop? Check yours with a photo
Every plant is a little different. Take a photo of your smooth sumac 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Will my tree grow its leaves back this year?
- If the tree is stressed by drought, it might produce new leaves once it is hydrated. If the cause is root rot, it may not recover until the next growing season.
- Should I fertilize a tree that is losing leaves?
- No, never fertilize a stressed tree. This forces it to grow when it needs to focus on healing its roots.
Guides to these causes
More problems with Smooth sumac
- Why is my Smooth sumac drooping?
- What are these bumps on my Smooth sumac leaves?
- Why are my smooth sumac's leaves curling?
- Why is my Smooth sumac growing so tall and thin?
- Why are my smooth sumac's leaves turning yellow?
- Why does my smooth sumac have spots on its leaves?
- Is my smooth sumac suffering from root rot?
Back to the Smooth sumac 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.