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Giant Waterlily · Victoria amazonica

Why are my Giant Waterlily leaves turning yellow?

Yellowing leaves on a Victoria amazonica usually signal a nutrient deficiency or a lack of sufficient sunlight. Check your water temperature and fertilizer levels first, as these plants are heavy feeders.

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yellow leaves on a plant
Photo: Trio3D, CC BY-SA 4.0

Check these first

  1. Test the water for nutrient levels.
  2. Measure the daily hours of direct sunlight.
  3. Check the water temperature to ensure it stays above 80 degrees Fahrenheit.

Likely causes

  1. Nutrient Deficiency

    Most likely

    How to tell: Older leaves turn yellow while the veins remain green, or the whole leaf pales.

    What to do: Add a high quality aquatic fertilizer tablet directly into the soil substrate. Use one tablet per month during the active growing season.

  2. Insufficient Sunlight

    Possible

    How to tell: The plant looks weak and the leaves lose their deep green color.

    What to do: Ensure the plant receives at least 8 to 10 hours of direct sunlight daily. If your pond is shaded by trees, consider trimming back branches to allow more light.

Yellow leaves on other plants

Find out what's wrong with your giant waterlily

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 oldest, outermost leaves to yellow and die back as the plant produces new growth. Worry if the center leaves or multiple leaves yellow at once.

Stopping it coming back

Maintain a consistent fertilization schedule and keep the water surface clear of debris to maximize light exposure.

Giant Waterlily: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your giant waterlily 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.

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Questions people ask

Can I use regular houseplant fertilizer?
No, you must use aquatic plant fertilizer tablets that are designed to stay in the soil without polluting the water.
Does water temperature cause yellowing?
Yes, if the water drops below 75 degrees Fahrenheit, the plant will struggle to absorb nutrients and may show yellowing.

More problems with Giant Waterlily

Back to the Giant Waterlily 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.