Can I save a plant with rust?

Yes, by removing infected leaves and using a fungicide, you can stop the spread. Keep the plant in a well ventilated area to discourage fungal growth.

Does my Canna need more fertilizer if it turns yellow?

Not necessarily, as over-fertilizing can also cause leaf burn. Check your watering habits first before adding more nutrients.

Canna lily: yellow leaves, causes and fixes

Check these first

Check the soil moisture to see if it is waterlogged.
Look for orange or brown spots on the undersides of the leaves.
Ensure the pot has proper drainage.

Likely causes

Overwatering
Most likely
How to tell: The lower leaves turn yellow and the soil stays soggy for days. You might notice a sour smell coming from the pot.
What to do: Allow the top inch of soil to dry out slightly before watering again. Ensure your pot has drainage holes so excess water can escape.
Canna Rust
Possible
How to tell: You see small, bright orange or brown spots on the leaves that eventually turn yellow. The foliage looks sickly and may drop prematurely.
What to do: Remove and destroy any infected leaves immediately to stop the spread. Apply a copper based fungicide every 10 to 14 days during humid weather.

Yellow leaves on other plants

Find out what's wrong with your canna lily

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

A single yellow leaf at the base of the plant is normal as the plant ages. If the yellowing is widespread or accompanied by spots, it requires immediate attention.

Stopping it coming back

Water only when the top layer of soil is dry and keep the leaves dry by watering at the base of the plant.

Canna lily: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your canna lily 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.

Get the app · Or check it from a photo now, free

Questions people ask

Can I save a plant with rust?: Yes, by removing infected leaves and using a fungicide, you can stop the spread. Keep the plant in a well ventilated area to discourage fungal growth.
Does my Canna need more fertilizer if it turns yellow?: Not necessarily, as over-fertilizing can also cause leaf burn. Check your watering habits first before adding more nutrients.

Guides to these causes

Canna Rust

Why are my Canna lily leaves turning yellow?