Pocket Botanist
Check these first
- Assess the current light levels in your room.
- Move the plant to a brighter location.
- Check if the plant is crowded in its pot.
Likely causes
Insufficient Light
Most likelyHow to tell: The stems grow long and thin with large gaps between the blades. The plant leans heavily toward the nearest window.
What to do: Move the pot to a spot that receives full sun or bright indirect light. If you are growing it indoors, consider adding a grow light for 8 to 10 hours a day.
Crowded Conditions
PossibleHow to tell: The grass blades look thin and weak because they are competing for resources. The center of the clump may start to die back.
What to do: Divide the clump into smaller sections during the spring. Replant them in fresh soil with enough space to allow for proper airflow.
Find out what's wrong with your heath 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.
Scan with your phone's camera to get the app
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When to worry
It is normal for grass to stretch slightly during the darker winter months. Worry if the stems become so weak they cannot stand upright.
Stopping it coming back
Keep your grass in a bright spot and divide the plant every 2 to 3 years to maintain a compact shape.
Heath grass: leggy growth? Check yours with a photo
Every plant is a little different. Take a photo of your heath 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 grass?
- Yes, you can trim the blades back to encourage fresh, dense growth. Use clean scissors to cut the foliage down to about 2 inches above the soil line.
- Does low light kill heath grass?
- It will not kill it immediately, but the plant will become weak and prone to disease. It needs consistent light to stay healthy.
More problems with heath grass
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.