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Check these first
- Inspect the water for clarity.
- Check if the soil is still saturated.
- Look for signs of new growth at the tips.
Likely causes
Nutrient Deficiency
Most likelyHow to tell: The older leaves turn yellow while the veins remain green. This happens when the plant exhausts the nutrients in its container.
What to do: Apply a balanced, water soluble fertilizer once every 4 to 6 weeks. Use a half strength dose to avoid burning the roots.
Poor Water Quality
PossibleHow to tell: Leaves yellow rapidly and the water may look cloudy or smell off. High levels of chlorine or pollutants can stress the plant.
What to do: Change 25 to 50 percent of the water in your container. Use dechlorinated water or let tap water sit out for 24 hours before adding it.
Find out what's wrong with your alligator weed
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 to the new growth or if the stems start to mush. A single yellow leaf at the base is usually just the plant shedding old foliage.
Stopping it coming back
Keep the water clean and provide a light feeding schedule during the growing season.
Alligator weed: yellow leaves? Check yours with a photo
Every plant is a little different. Take a photo of your alligator weed 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 use regular houseplant fertilizer?
- Yes, but ensure it is safe for aquatic environments. Avoid fertilizers with high copper content if you have fish in the water.
- Does yellowing mean I am overwatering?
- No, Alligator weed loves saturated soil and standing water. It is almost impossible to overwater this species.
More problems with Alligator weed
Back to the Alligator weed 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.