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Check these first
- Feel the soil moisture two inches down.
- Inspect the drainage holes for blockages.
- Check for signs of pests on the undersides of leaves.
Likely causes
Overwatering
Most likelyHow to tell: The soil feels soggy or swampy to the touch. You might notice a sour smell coming from the pot.
What to do: Allow the top 2 inches of soil to dry out before watering again. Ensure your container has drainage holes to let excess water escape.
Nutrient deficiency
PossibleHow to tell: Older leaves turn yellow while the veins remain green. This happens when the plant runs out of food in the soil.
What to do: Apply a balanced liquid fertilizer diluted to half strength once a month during the growing season. This provides the nitrogen needed for lush growth.
Find out what's wrong with your giant reed
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 the very bottom leaves to yellow and drop as the plant grows taller. Worry if the yellowing spreads rapidly to the upper foliage.
Stopping it coming back
Maintain a consistent watering schedule and feed the plant regularly during spring and summer.
Giant reed: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your giant reed 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
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Questions people ask
- Should I cut off yellow leaves?
- Yes, you can trim them off with clean shears. This keeps the plant looking tidy and helps it focus energy on healthy growth.
- Does giant reed need a lot of fertilizer?
- It is a fast grower and appreciates regular feeding. Use a standard garden fertilizer during the active growing months.
More problems with Giant reed
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.