Is this disease fatal?

It can be if left untreated, as it will eventually destroy the foliage. Catching it early and removing infected parts usually saves the plant.

Can I mist my fern if it has spots?

Stop misting immediately. Misting keeps the leaves wet and encourages the spread of fungal and bacterial spores.

Delta maidenhair fern: spots, causes and fixes

Check these first

Check if the spots have a yellow halo.
Inspect the soil to see if it is waterlogged.
Look for signs of poor air circulation.

Likely causes

Fungal Leaf Spot
Most likely
How to tell: Small, circular brown or black spots appear on the fronds.
What to do: Remove the affected fronds immediately to stop the spread. Improve air circulation around the plant and avoid getting water on the leaves when watering.
Bacterial Leaf Spot
Possible
How to tell: Water-soaked spots that enlarge and may have a yellow halo around them.
What to do: Isolate the plant and trim away infected areas with sterilized shears. Ensure the plant is not sitting in stagnant water and reduce humidity slightly until the infection clears.

Leaf spots on other plants

Find out what's wrong with your delta maidenhair 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 spots are spreading rapidly to new growth, it is a serious infection. Minor spots on older leaves are sometimes just a sign of aging.

Stopping it coming back

Water at the base of the plant rather than over the top of the foliage. Provide gentle air movement in the room.

Delta maidenhair fern: spots? Check yours with a photo

Every plant is a little different. Take a photo of your delta maidenhair 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

Is this disease fatal?: It can be if left untreated, as it will eventually destroy the foliage. Catching it early and removing infected parts usually saves the plant.
Can I mist my fern if it has spots?: Stop misting immediately. Misting keeps the leaves wet and encourages the spread of fungal and bacterial spores.

Guides to these causes

Leaf Spot

Why are there spots on my Fringed Maidenhair Fern?