Does this spread to other plants?

Yes, crown rot can spread through the water. Isolate the affected plant immediately to protect your other water lilies.

Is it too late if the leaves fall off?

Not necessarily, as long as the rhizome itself is still firm. Trim the rot and give it a chance to sprout new growth.

American white waterlily: root rot, causes and fixes

Check these first

Lift the plant and smell the base for rot.
Check if the rhizome feels firm or mushy.
Examine the water for excessive debris buildup.

Likely causes

Crown rot
Most likely
How to tell: The center of the plant feels soft, mushy, and may have a foul odor. The leaves will detach easily from the crown.
What to do: Remove the plant from the water and cut away all mushy, decaying parts with a clean, sharp knife. Replant the healthy rhizome in fresh, heavy clay soil and keep it in a separate container until it recovers.
Poor water circulation
Possible
How to tell: The water around the plant looks stagnant and debris is building up around the crown.
What to do: Increase water movement with a pump or fountain. Clear away decaying organic matter from the bottom of the pond to improve oxygen levels.

Root rot in other plants

Find out what's wrong with your american white 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.

When to worry

If the entire crown is mushy, the plant may be beyond saving. Act as soon as you notice a foul smell or softening.

Stopping it coming back

Avoid overcrowding your lilies and ensure they have enough space for water to circulate around the crown.

American white waterlily: root rot? Check yours with a photo

Every plant is a little different. Take a photo of your american white 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

Does this spread to other plants?: Yes, crown rot can spread through the water. Isolate the affected plant immediately to protect your other water lilies.
Is it too late if the leaves fall off?: Not necessarily, as long as the rhizome itself is still firm. Trim the rot and give it a chance to sprout new growth.

Guides to these causes

Root Rot

Why is my American white waterlily base decaying?