Pocket Botanist
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Check these first
- Feel the soil moisture level with your finger.
- Check the drainage holes for blockages.
- Inspect the undersides of leaves for tiny pests.
Likely causes
Overwatering
PossibleHow to tell: The leaves turn yellow and feel soft or mushy to the touch. The soil stays wet for more than 10 days.
What to do: Let the top 2 inches of soil dry out completely before watering again. Ensure your pot has drainage holes so extra water can escape.
Nutrient Deficiency
PossibleHow to tell: Older leaves turn yellow while veins remain green, often indicating a lack of nitrogen or iron. This happens if the plant has been in the same soil for a long time.
What to do: Apply a balanced liquid fertilizer diluted to half strength once every 4 weeks during the growing season. If the soil is old, consider repotting with fresh, nutrient rich potting mix.
Find out what's wrong with your american senna
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
Worry if the yellowing spreads rapidly across the whole plant. It is normal for the very oldest leaves at the bottom to yellow and drop as the plant grows.
Stopping it coming back
Maintain a consistent watering schedule and avoid letting the plant sit in standing water.
American senna: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your american senna 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 yellow leaves?
- Yes, you can trim them off with clean scissors to keep the plant looking tidy. They will not turn green again.
- Can too much sun cause yellowing?
- Usually, too much sun causes bleaching or brown scorching rather than yellowing. If the leaves are yellow, look at your watering habits first.
More problems with American senna
- Why are there spots on my American senna leaves?
- Why is my American senna looking leggy?
- Why is my American senna drooping?
- Why do my American senna leaves have brown tips?
- Why is my American senna dropping its leaves?
- Why is my American senna not flowering?
- What are these bugs on my American senna?
- Why is my American senna wilting?
Back to the American senna 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.