Should I fertilize a yellowing fern?

No, do not fertilize a stressed plant. Wait until it is healthy and growing again before adding any plant food.

Is yellowing a sign of pests?

It can be, though less common than watering issues. Check the undersides of the leaves for tiny insects just in case.

American royal fern: yellow leaves, causes and fixes

Check these first

Check if the soil is soggy or waterlogged.
Smell the soil for a musty or rotten odor.
Observe the light intensity in the plant's current spot.

Likely causes

Overwatering
Most likely
How to tell: The fronds turn yellow and feel soft or mushy. The soil may smell sour or stay soggy for too long.
What to do: Reduce your watering frequency and ensure the pot drains well. If the soil is waterlogged, repot the fern into fresh, well draining soil.
Too Much Light
Possible
How to tell: The fronds turn a pale, washed out yellow color. This happens when the plant is exposed to too much direct light.
What to do: Move the plant to a shadier spot. Royal ferns thrive in partial to full shade.

Yellow leaves on other plants

Find out what's wrong with your american royal fern

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 yellowing starts at the base and moves upward, it is a sign of root trouble. It is normal for the oldest, lowest fronds to yellow and die back as the plant matures.

Stopping it coming back

Ensure the soil stays damp but never swampy, and keep the plant out of direct sun.

American royal fern: yellow leaves? Check yours with a photo

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

Should I fertilize a yellowing fern?: No, do not fertilize a stressed plant. Wait until it is healthy and growing again before adding any plant food.
Is yellowing a sign of pests?: It can be, though less common than watering issues. Check the undersides of the leaves for tiny insects just in case.

Why are my American royal fern's leaves turning yellow?