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Check these first
- Check the soil moisture by pushing a finger two inches into the ground.
- Inspect the base of the stems for any signs of rot or mushiness.
- Look at the surrounding plants to see if they show similar yellowing.
Likely causes
Poor Drainage
PossibleHow to tell: The soil stays soggy for days after rain, and the base of the stems may look mushy. This happens when the plant sits in heavy clay that does not drain well.
What to do: Amend the soil with organic compost to improve aeration. If the plant is in a container, ensure it has large drainage holes and move it to a spot with better airflow.
Nitrogen Deficiency
PossibleHow to tell: The older, lower leaves turn yellow while the rest of the plant looks stunted. This occurs when the soil lacks the nutrients needed to support the rapid growth of this tall grass.
What to do: Apply a balanced, slow release fertilizer in early spring. Avoid over fertilizing, as this can cause the grass to flop over.
Find out what's wrong with your big bluestem
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.
Scan with your phone's camera to get the app
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When to worry
Be concerned if the yellowing spreads rapidly across the entire clump. It is normal for a few lower leaves to yellow as the plant prepares for winter dormancy.
Stopping it coming back
Ensure your Big Bluestem is planted in well draining soil and receives at least six hours of direct sun daily.
Big bluestem: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your big bluestem 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
- Should I cut off the yellow leaves?
- Yes, you can trim them back to keep the plant looking tidy. It will not harm the grass to remove dead or dying foliage.
- Does yellowing mean I am underwatering?
- Usually not, as Big Bluestem is quite drought tolerant once established. Yellowing is almost always a sign of too much water or a nutrient imbalance.
More problems with Big bluestem
Back to the Big bluestem 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.