Pocket Botanist
Check these first
- Assess the daily hours of direct sun your plant receives.
- Rotate the pot to ensure even light exposure on all sides.
- Check if the container is becoming root bound.
Likely causes
Insufficient light
Most likelyHow to tell: The stems grow long and weak, leaning heavily toward the nearest light source. The foliage will also look paler than usual.
What to do: Move your plant to a spot that receives at least 6 hours of direct sunlight daily. If you are growing it indoors, place it directly in a south facing window or use a strong grow light.
Overcrowding
PossibleHow to tell: This is less common for this plant, but it usually happens when the root system is too cramped in its container. You will see the grass struggling to maintain a dense, upright habit.
What to do: Divide the root clump into smaller sections and repot them into fresh, nutrient rich soil. Ensure each new pot has plenty of room for the roots to expand.
Find out what's wrong with your reed canary grass
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
It is normal for this grass to grow tall, but it should remain sturdy. Worry if the stems are flopping over or unable to support their own weight.
Stopping it coming back
Keep your grass in a high light environment and divide the clumps every 2 to 3 years to maintain vigor.
Reed canary grass: leggy growth? Check yours with a photo
Every plant is a little different. Take a photo of your reed canary grass 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
- Can I trim back leggy stems?
- Yes, you can mow or trim the grass back to a few inches above the soil. This encourages fresh, dense growth once the light issues are corrected.
- Does fertilizer help with legginess?
- No, adding fertilizer to a plant that lacks light will only make it grow faster and even more spindly. Fix the light first.
More problems with Reed canary grass
Back to the Reed canary grass 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.